sw_multiplex.c File Reference

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Macros
#define	MPX_NONDECR_HYBRID
#define	MPX_MINCYC   25000
#define	SCALE_EVENT   PAPI_TOT_CYC

Functions
static void	mpx_remove_unused (MasterEvent **head)
static void	mpx_delete_events (MPX_EventSet *)
static void	mpx_delete_one_event (MPX_EventSet *mpx_events, int Event)
static int	mpx_insert_events (MPX_EventSet *, int *event_list, int num_events, int domain, int granularity)
static void	mpx_handler (int signal)
inline_static void	mpx_hold (void)
inline_static void	mpx_release (void)
static void	mpx_init_timers (int interval)
static int	mpx_startup_itimer (void)
static void	mpx_restore_signal (void)
static void	mpx_shutdown_itimer (void)
static MasterEvent *	get_my_threads_master_event_list (void)
static MPX_EventSet *	mpx_malloc (Threadlist *t)
int	mpx_add_event (MPX_EventSet **mpx_events, int EventCode, int domain, int granularity)
int	mpx_remove_event (MPX_EventSet **mpx_events, int EventCode)
int	MPX_add_events (MPX_EventSet **mpx_events, int *event_list, int num_events, int domain, int granularity)
int	MPX_start (MPX_EventSet *mpx_events)
int	MPX_read (MPX_EventSet *mpx_events, long long *values, int called_by_stop)
int	MPX_reset (MPX_EventSet *mpx_events)
int	MPX_stop (MPX_EventSet *mpx_events, long long *values)
int	MPX_cleanup (MPX_EventSet **mpx_events)
void	MPX_shutdown (void)
int	mpx_check (int EventSet)
int	mpx_init (int interval_ns)

Variables
static Threadlist *	tlist = NULL
static unsigned int	randomseed
static sigset_t	sigreset
static struct itimerval	itime
static const struct itimerval	itimestop = { {0, 0}, {0, 0} }
static struct sigaction	oaction

Detailed Description

Author

Philip Mucci mucci.nosp@m.@cs..nosp@m.utk.e.nosp@m.du

John May johnm.nosp@m.ay@l.nosp@m.lnl.g.nosp@m.ov

Nils Smeds smeds.nosp@m.@pdc.nosp@m..kth..nosp@m.se

Haihang You you@c.nosp@m.s.ut.nosp@m.k.edu

Kevin London londo.nosp@m.n@cs.nosp@m..utk..nosp@m.edu

Maynard Johnson mayna.nosp@m.rdj@.nosp@m.us.ib.nosp@m.m.co.nosp@m.m

Dan Terpstra terps.nosp@m.tra@.nosp@m.cs.ut.nosp@m.k.ed.nosp@m.u

Definition in file sw_multiplex.c.

Macro Definition Documentation

MPX_MINCYC

#define MPX_MINCYC   25000

Definition at line 134 of file sw_multiplex.c.

MPX_NONDECR_HYBRID

#define MPX_NONDECR_HYBRID

xxxx Will this stuff run unmodified on multiple components? What happens when several components are counting multiplexed?

Definition at line 24 of file sw_multiplex.c.

SCALE_EVENT

#define SCALE_EVENT   PAPI_TOT_CYC

Definition at line 440 of file sw_multiplex.c.

Function Documentation

get_my_threads_master_event_list()

static MasterEvent * get_my_threads_master_event_list ( void  )

static

Definition at line 268 of file sw_multiplex.c.

{
    Threadlist *t = tlist;
    unsigned long tid;
 
    MPXDBG( "tlist is %p\n", tlist );
    if ( tlist == NULL )
        return NULL;
 
    if ( _papi_hwi_thread_id_fn == NULL )
        return ( tlist->head );
 
    tid = _papi_hwi_thread_id_fn(  );
    unsigned long pid = ( unsigned long ) getpid(  );
 
    while ( t ) {
        if ( t->tid == tid || ( ( tid == 0 ) && ( t->tid == pid ) ) )
            return ( t->head );
        t = t->next;
    }
    return ( NULL );
}

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mpx_add_event()

int mpx_add_event	(	MPX_EventSet **	mpx_events,
		int	EventCode,
		int	domain,
		int	granularity
	)

Definition at line 305 of file sw_multiplex.c.

{
    MPX_EventSet *newset = *mpx_events;
    int retval, alloced_newset = 0;
    Threadlist *t;
 
    /* Get the global list of threads */
 
    MPXDBG("Adding %p %#x\n",newset,EventCode);
 
    _papi_hwi_lock( MULTIPLEX_LOCK );
    t = tlist;
 
    /* If there are no threads in the list at all, then allocate the new Threadlist */
 
    if ( t == NULL ) {
      new_thread:
        t = ( Threadlist * ) papi_malloc( sizeof ( Threadlist ) );
        if ( t == NULL ) {
            _papi_hwi_unlock( MULTIPLEX_LOCK );
            return ( PAPI_ENOMEM );
        }
 
        /* If we're actually threaded, fill the 
         * field with the thread_id otherwise
         * use getpid() as a placeholder. */
 
        if ( _papi_hwi_thread_id_fn ) {
            MPXDBG( "New thread at %p\n", t );
            t->tid = _papi_hwi_thread_id_fn(  );
        } else {
            MPXDBG( "New process at %p\n", t );
            t->tid = ( unsigned long ) getpid(  );
        }
 
        /* Fill in the fields */
 
        t->head = NULL;
        t->cur_event = NULL;
        t->next = tlist;
        tlist = t;
        MPXDBG( "New head is at %p(%lu).\n", tlist,
                ( long unsigned ) tlist->tid );
        /* alloced_thread = 1; */
    } else if ( _papi_hwi_thread_id_fn ) {
 
        /* If we are threaded, AND there exists threads in the list, 
         *  then try to find our thread in the list. */
 
        unsigned long tid = _papi_hwi_thread_id_fn(  );
 
        while ( t ) {
            if ( t->tid == tid ) {
                MPXDBG( "Found thread %#lx\n", t->tid );
                break;
            }
            t = t->next;
        }
 
        /* Our thread is not in the list, so make a new
         * thread entry. */
 
        if ( t == NULL ) {
            MPXDBG( "New thread %lx\n", tid );
            goto new_thread;
        }
    }
 
    /* Now t & tlist points to our thread, also at the head of the list */
 
    /* Allocate a the MPX_EventSet if necessary */
 
    if ( newset == NULL ) {
        newset = mpx_malloc( t );
        if ( newset == NULL ) {
            _papi_hwi_unlock( MULTIPLEX_LOCK );
            return ( PAPI_ENOMEM );
        }
        alloced_newset = 1;
    }
 
    /* Now we're finished playing with the thread list */
 
    _papi_hwi_unlock( MULTIPLEX_LOCK );
 
    /* Removed newset->num_events++, moved to mpx_insert_events() */
 
    mpx_hold(  );
 
    /* Create PAPI events (if they don't already exist) and link
     * the new event set to them, add them to the master list for
     the thread, reset master event list for this thread */
 
    retval = mpx_insert_events( newset, &EventCode, 1, 
                    domain, granularity );
    if ( retval != PAPI_OK ) {
        if ( alloced_newset ) {
            papi_free( newset );
            newset = NULL;
        }
    }
 
    mpx_release(  );
 
    /* Output the new or existing EventSet */
 
    *mpx_events = newset;
 
    return retval;
}

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MPX_add_events()

int MPX_add_events	(	MPX_EventSet **	mpx_events,
		int *	event_list,
		int	num_events,
		int	domain,
		int	granularity
	)

Definition at line 676 of file sw_multiplex.c.

{
    int i, retval = PAPI_OK;
 
    for ( i = 0; i < num_events; i++ ) {
        retval =
            mpx_add_event( mpx_events, event_list[i], domain, granularity );
 
        if ( retval != PAPI_OK )
            return ( retval );
    }
    return ( retval );
}

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mpx_check()

int mpx_check

(

int

EventSet

)

Definition at line 1121 of file sw_multiplex.c.

{
    /* Currently, there is only the need for one mpx check: if
     * running on POWER6/perfctr platform, the domain must
     * include user, kernel, and supervisor, since the scale
     * event uses the dedicated counter #6, PM_RUN_CYC, which
     * cannot be controlled on a domain level.
     */
    EventSetInfo_t *ESI = _papi_hwi_lookup_EventSet( EventSet );
 
    if (ESI==NULL) return PAPI_EBUG;
 
    if ( strstr( _papi_hwd[ESI->CmpIdx]->cmp_info.name, "perfctr.c" ) == NULL )
        return PAPI_OK;
 
    if ( strcmp( _papi_hwi_system_info.hw_info.model_string, "POWER6" ) == 0 ) {
        unsigned int chk_domain =
            PAPI_DOM_USER + PAPI_DOM_KERNEL + PAPI_DOM_SUPERVISOR;
 
        if ( ( ESI->domain.domain & chk_domain ) != chk_domain ) {
            PAPIERROR
                ( "This platform requires PAPI_DOM_USER+PAPI_DOM_KERNEL+PAPI_DOM_SUPERVISOR\n"
                  "to be set in the domain when using multiplexing.  Instead, found %#x\n",
                  ESI->domain.domain );
            return ( PAPI_EINVAL_DOM );
        }
    }
    return PAPI_OK;
}

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MPX_cleanup()

int MPX_cleanup

(

MPX_EventSet **

mpx_events

)

Definition at line 1069 of file sw_multiplex.c.

{
#ifdef PTHREADS
    int retval;
#endif
 
    if ( mpx_events == NULL )
       return PAPI_EINVAL;
 
    if ( *mpx_events == NULL )
       return PAPI_OK;
 
    if (( *mpx_events )->status == MPX_RUNNING )
       return PAPI_EINVAL;
 
    mpx_hold(  );
 
    /* Remove master events from this event set and from
     * the master list, if necessary.
     */
    mpx_delete_events( *mpx_events );
 
    mpx_release(  );
 
    /* Free all the memory */
 
    papi_free( *mpx_events );
 
    *mpx_events = NULL;
    return PAPI_OK;
}

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mpx_delete_events()

static void mpx_delete_events ( MPX_EventSet *  mpx_events )

static

Remove events from an mpx event set (and from the master event set for this thread, if the events are unused). MUST BE CALLED WITH THE SIGNAL HANDLER DISABLED

Definition at line 1336 of file sw_multiplex.c.

{
    int i;
    MasterEvent *mev;
 
    /* First decrement the reference counter for each master
     * event in this event set, then see if the master events
     * can be deleted.
     */
    for ( i = 0; i < mpx_events->num_events; i++ ) {
        mev = mpx_events->mev[i];
        --mev->uses;
        mpx_events->mev[i] = NULL;
        /* If it's no longer used, it should not be active! */
        assert( mev->uses || !( mev->active ) );
    }
    mpx_events->num_events = 0;
    mpx_remove_unused( &mpx_events->mythr->head );
}

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mpx_delete_one_event()

static void mpx_delete_one_event ( MPX_EventSet *  mpx_events, int  Event  )

static

Remove one event from an mpx event set (and from the master event set for this thread, if the events are unused). MUST BE CALLED WITH THE SIGNAL HANDLER DISABLED

Definition at line 1361 of file sw_multiplex.c.

{
    int i;
    MasterEvent *mev;
 
    /* First decrement the reference counter for each master
     * event in this event set, then see if the master events
     * can be deleted.
     */
    for ( i = 0; i < mpx_events->num_events; i++ ) {
        mev = mpx_events->mev[i];
        if ( mev->pi.event_type == Event ) {
            --mev->uses;
            mpx_events->num_events--;
            mpx_events->mev[i] = NULL;
            /* If it's no longer used, it should not be active! */
            assert( mev->uses || !( mev->active ) );
            break;
        }
    }
 
    /* If we removed an event that is not last in the list we
     * need to compact the event list
     */
 
    for ( ; i < mpx_events->num_events; i++ ) {
        mpx_events->mev[i] = mpx_events->mev[i + 1];
        mpx_events->start_values[i] = mpx_events->start_values[i + 1];
        mpx_events->stop_values[i] = mpx_events->stop_values[i + 1];
        mpx_events->start_hc[i] = mpx_events->start_hc[i + 1];
    }
    mpx_events->mev[i] = NULL;
 
    mpx_remove_unused( &mpx_events->mythr->head );
 
}

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mpx_handler()

static void mpx_handler ( int  signal )

static

Definition at line 445 of file sw_multiplex.c.

{
    int retval;
    MasterEvent *mev, *head;
    Threadlist *me = NULL;
#ifdef REGENERATE
    int lastthread;
#endif
#ifdef MPX_DEBUG_OVERHEAD
    long long usec;
    int didwork = 0;
    usec = PAPI_get_real_usec(  );
#endif
#ifdef MPX_DEBUG_TIMER
    long long thiscall;
#endif
 
    signal = signal;         /* unused */
 
    MPXDBG( "Handler in thread\n" );
 
    /* This handler can be invoked either when a timer expires
     * or when another thread in this handler responding to the
     * timer signals other threads.  We have to distinguish
     * these two cases so that we don't get infinite loop of 
     * handler calls.  To do that, we look at the value of
     * threads_responding.  We assume that only one thread can
     * be active in this signal handler at a time, since the
     * invoking signal is blocked while the handler is active.
     * If threads_responding == 0, the current thread caught
     * the original timer signal.  (This thread may not have
     * any active event lists itself, though.)  This first
     * thread sends a signal to each of the other threads in
     * our list of threads that have master events lists.  If
     * threads_responding != 0, then this thread was signaled
     * by another thread.  We decrement that value and look
     * for an active events.  threads_responding should
     * reach zero when all active threads have handled their
     * signal.  It's probably possible for a thread to die
     * before it responds to a signal; if that happens,
     * threads_responding won't reach zero until the next
     * timer signal happens.  Then the signalled thread won't
     * signal any other threads.  If that happens only
     * occasionally, there should be no harm.  Likewise if
     * a new thread is added that fails to get signalled.
     * As for locking, we have to lock this list to prevent
     * another thread from modifying it, but if *this* thread
     * is trying to update the list (from another function) and
     * is signaled while it holds the lock, we will have deadlock.
     * Therefore, noninterrupt functions that update *this* list
     * must disable the signal that invokes this handler.
     */
 
#ifdef PTHREADS
    _papi_hwi_lock( MULTIPLEX_LOCK );
 
    if ( threads_responding == 0 ) {    /* this thread caught the timer sig */
        /* Signal the other threads with event lists */
#ifdef MPX_DEBUG_TIMER
        thiscall = _papi_hwd_get_real_usec(  );
        MPXDBG( "last signal was %lld usec ago\n", thiscall - lastcall );
        lastcall = thiscall;
#endif
        MPXDBG( "%#x caught it, tlist is %p\n", self, tlist );
        for ( t = tlist; t != NULL; t = t->next ) {
            if ( pthread_equal( t->thr, self ) == 0 ) {
                ++threads_responding;
                retval = pthread_kill( t->thr, _papi_os_info.itimer_sig );
                assert( retval == 0 );
#ifdef MPX_DEBUG_SIGNALS
                MPXDBG( "%#x signaling %#x\n", self, t->thr );
#endif
            }
        }
    } else {
#ifdef MPX_DEBUG_SIGNALS
        MPXDBG( "%#x was tapped, tr = %d\n", self, threads_responding );
#endif
        --threads_responding;
    }
#ifdef REGENERATE
    lastthread = ( threads_responding == 0 );
#endif
    _papi_hwi_unlock( MULTIPLEX_LOCK );
#endif
 
    /* See if this thread has an active event list */
    head = get_my_threads_master_event_list(  );
    if ( head != NULL ) {
 
        /* Get the thread header for this master event set.  It's
         * always in the first record of the set (and maybe in others)
         * if any record in the set is active.
         */
        me = head->mythr;
 
        /* Find the event that's currently active, stop and read
         * it, then start the next event in the list.
         * No need to lock the list because other functions
         * disable the timer interrupt before they update the list.
         */
        if ( me != NULL && me->cur_event != NULL ) {
            long long counts[2];
            MasterEvent *cur_event = me->cur_event;
            long long cycles = 0, total_cycles = 0;
 
            retval = PAPI_stop( cur_event->papi_event, counts );
            MPXDBG( "retval=%d, cur_event=%p, I'm tid=%lx\n",
                    retval, cur_event, me->tid );
 
            if ( retval == PAPI_OK ) {
                MPXDBG( "counts[0] = %lld counts[1] = %lld\n", counts[0],
                        counts[1] );
 
                cur_event->count += counts[0];
                cycles = ( cur_event->pi.event_type == SCALE_EVENT )
                    ? counts[0] : counts[1];
 
                me->total_c += cycles;
                total_cycles = me->total_c - cur_event->prev_total_c;
                cur_event->prev_total_c = me->total_c;
 
                /* If it's a rate, count occurrences & average later */
                if ( !cur_event->is_a_rate ) {
                    cur_event->cycles += cycles;
                    if ( cycles >= MPX_MINCYC ) {   /* Only update current rate on a decent slice */
                        cur_event->rate_estimate =
                            ( double ) counts[0] / ( double ) cycles;
                    }
                    cur_event->count_estimate +=
                        ( long long ) ( ( double ) total_cycles *
                                        cur_event->rate_estimate );
                                        MPXDBG("New estimate = %lld (%lld cycles * %lf rate)\n",
                                               cur_event->count_estimate,total_cycles,
                                               cur_event->rate_estimate);
                } else {
                    /* Make sure we ran long enough to get a useful measurement (otherwise
                     * potentially inaccurate rate measurements get averaged in with
                     * the same weight as longer, more accurate ones.)
                     */
                    if ( cycles >= MPX_MINCYC ) {
                        cur_event->cycles += 1;
                    } else {
                        cur_event->count -= counts[0];
                    }
                }
            } else {
                MPXDBG( "%lx retval = %d, skipping\n", me->tid, retval );
                MPXDBG( "%lx value = %lld cycles = %lld\n\n",
                        me->tid, cur_event->count, cur_event->cycles );
            }
 
            MPXDBG
                ( "tid(%lx): value = %lld (%lld) cycles = %lld (%lld) rate = %lf\n\n",
                  me->tid, cur_event->count, cur_event->count_estimate,
                  cur_event->cycles, total_cycles, cur_event->rate_estimate );
            /* Start running the next event; look for the
             * next one in the list that's marked active.
             * It's possible that this event is the only
             * one active; if so, we should restart it,
             * but only after considerating all the other
             * possible events.
             */
            if ( ( retval != PAPI_OK ) ||
                 ( ( retval == PAPI_OK ) && ( cycles >= MPX_MINCYC ) ) ) {
                for ( mev =
                      ( cur_event->next == NULL ) ? head : cur_event->next;
                      mev != cur_event;
                      mev = ( mev->next == NULL ) ? head : mev->next ) {
                    /* Found the next one to start */
                    if ( mev->active ) {
                        me->cur_event = mev;
                        break;
                    }
                }
            }
 
            if ( me->cur_event->active ) {
                retval = PAPI_start( me->cur_event->papi_event );
            }
#ifdef MPX_DEBUG_OVERHEAD
            didwork = 1;
#endif
        }
    }
#ifdef ANY_THREAD_GETS_SIGNAL
    else {
        Threadlist *t;
        for ( t = tlist; t != NULL; t = t->next ) {
            if ( ( t->tid == _papi_hwi_thread_id_fn(  ) ) ||
                 ( t->head == NULL ) )
                continue;
            MPXDBG( "forwarding signal to thread %lx\n", t->tid );
            retval = ( *_papi_hwi_thread_kill_fn ) ( t->tid, _papi_os_info.itimer_sig );
            if ( retval != 0 ) {
                MPXDBG( "forwarding signal to thread %lx returned %d\n",
                        t->tid, retval );
            }
        }
    }
#endif
 
#ifdef REGENERATE
    /* Regenerating the signal each time through has the
     * disadvantage that if any thread ever drops a signal,
     * the whole time slicing system will stop.  Using
     * an automatically regenerated signal may have the
     * disadvantage that a new signal can arrive very
     * soon after all the threads have finished handling
     * the last one, so the interval may be too small for
     * accurate data collection.  However, using the
     * MIN_CYCLES check above should alleviate this.
     */
    /* Reset the timer once all threads have responded */
    if ( lastthread ) {
        retval = setitimer( _papi_os_info.itimer_num, &itime, NULL );
        assert( retval == 0 );
#ifdef MPX_DEBUG_TIMER
        MPXDBG( "timer restarted by %lx\n", me->tid );
#endif
    }
#endif
 
#ifdef MPX_DEBUG_OVERHEAD
    usec = _papi_hwd_get_real_usec(  ) - usec;
    MPXDBG( "handler %#x did %swork in %lld usec\n",
            self, ( didwork ? "" : "no " ), usec );
#endif
}

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mpx_hold()

inline_static void mpx_hold

(

void

)

Definition at line 180 of file sw_multiplex.c.

{
    sigprocmask( SIG_BLOCK, &sigreset, NULL );
    MPXDBG( "signal held\n" );
}

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mpx_init()

int mpx_init

(

int

interval_ns

)

Definition at line 1152 of file sw_multiplex.c.

{
#if defined(PTHREADS) || defined(_POWER6)
    int retval;
#endif
 
#ifdef _POWER6
    retval = PAPI_event_name_to_code( "PM_RUN_CYC", &_PNE_PM_RUN_CYC );
    if ( retval != PAPI_OK )
        return ( retval );
#endif
    tlist = NULL;
    mpx_hold(  );
    mpx_shutdown_itimer(  );
    mpx_init_timers( interval_ns / 1000 );
 
    return ( PAPI_OK );
}

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mpx_init_timers()

static void mpx_init_timers ( int  interval )

static

Definition at line 194 of file sw_multiplex.c.

{
    /* Fill in the interval timer values now to save a
     * little time later.
     */
#ifdef OUTSIDE_PAPI
    interval = MPX_DEFAULT_INTERVAL;
#endif
 
#ifdef REGENERATE
    /* Signal handler restarts the timer every time it runs */
    itime.it_interval.tv_sec = 0;
    itime.it_interval.tv_usec = 0;
    itime.it_value.tv_sec = 0;
    itime.it_value.tv_usec = interval;
#else
    /* Timer resets itself automatically */
    itime.it_interval.tv_sec = 0;
    itime.it_interval.tv_usec = interval;
    itime.it_value.tv_sec = 0;
    itime.it_value.tv_usec = interval;
#endif
 
    sigemptyset( &sigreset );
    sigaddset( &sigreset, _papi_os_info.itimer_sig );
}

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mpx_insert_events()

static int mpx_insert_events ( MPX_EventSet *  mpx_events, int *  event_list, int  num_events, int  domain, int  granularity  )

static

Inserts a list of events into the master event list, and adds new mev pointers to the MPX_EventSet. MUST BE CALLED WITH THE TIMER INTERRUPT DISABLED

Definition at line 1176 of file sw_multiplex.c.

{
    int i, retval = 0, num_events_success = 0;
    MasterEvent *mev;
    PAPI_option_t options;
    MasterEvent **head = &mpx_events->mythr->head;
 
    MPXDBG("Inserting %p %d\n",mpx_events,mpx_events->num_events );
 
    /* Make sure we don't overrun our buffers */
    if (mpx_events->num_events + num_events > PAPI_MAX_SW_MPX_EVENTS) {
       return PAPI_ECOUNT;
    }
 
    /* For each event, see if there is already a corresponding
     * event in the master set for this thread.  If not, add it.
     */
    for ( i = 0; i < num_events; i++ ) {
 
        /* Look for a matching event in the master list */
        for( mev = *head; mev != NULL; mev = mev->next ) {
           if ( (mev->pi.event_type == event_list[i]) && 
            (mev->pi.domain == domain) &&
            (mev->pi.granularity == granularity ))
                break;
        }
 
        /* No matching event in the list; add a new one */
        if ( mev == NULL ) {
           mev = (MasterEvent *) papi_malloc( sizeof ( MasterEvent ) );
           if ( mev == NULL ) {
              return PAPI_ENOMEM;
           }
 
           mev->pi.event_type = event_list[i];
           mev->pi.domain = domain;
           mev->pi.granularity = granularity;
           mev->uses = mev->active = 0;
           mev->prev_total_c = mev->count = mev->cycles = 0;
           mev->rate_estimate = 0.0;
           mev->count_estimate = 0;
           mev->is_a_rate = 0;
           mev->papi_event = PAPI_NULL;
            
           retval = PAPI_create_eventset( &( mev->papi_event ) );
           if ( retval != PAPI_OK ) {
              MPXDBG( "Event %d could not be counted.\n", 
                  event_list[i] );
              goto bail;
           }
 
           retval = PAPI_add_event( mev->papi_event, event_list[i] );
           if ( retval != PAPI_OK ) {
              MPXDBG( "Event %d could not be counted.\n", 
                  event_list[i] );
              goto bail;
           }
 
           /* Always count total cycles so we can scale results.
            * If user just requested cycles, 
            * don't add that event again. */
 
           if ( event_list[i] != SCALE_EVENT ) {
              retval = PAPI_add_event( mev->papi_event, SCALE_EVENT );
              if ( retval != PAPI_OK ) {
             MPXDBG( "Scale event could not be counted "
                 "at the same time.\n" );
             goto bail;
              }
           }
            
           /* Set the options for the event set */
           memset( &options, 0x0, sizeof ( options ) );
           options.domain.eventset = mev->papi_event;
           options.domain.domain = domain;
           retval = PAPI_set_opt( PAPI_DOMAIN, &options );
           if ( retval != PAPI_OK ) {
              MPXDBG( "PAPI_set_opt(PAPI_DOMAIN, ...) = %d\n", 
                  retval );
              goto bail;
           }
 
           memset( &options, 0x0, sizeof ( options ) );
           options.granularity.eventset = mev->papi_event;
           options.granularity.granularity = granularity;
           retval = PAPI_set_opt( PAPI_GRANUL, &options );
           if ( retval != PAPI_OK ) {
              if ( retval != PAPI_ECMP ) {
             /* ignore component errors because they typically mean
                "not supported by the component" */
             MPXDBG( "PAPI_set_opt(PAPI_GRANUL, ...) = %d\n", 
                 retval );
             goto bail;
              }
           }
 
 
           /* Chain the event set into the 
            * master list of event sets used in
            * multiplexing. */
 
            mev->next = *head;
            *head = mev;
 
        }
 
        /* If we created a new event set, or we found a matching
         * eventset already in the list, then add the pointer in
         * the master list to this threads list. Then we bump the
         * number of successfully added events. */
    MPXDBG("Inserting now %p %d\n",mpx_events,mpx_events->num_events );
 
        mpx_events->mev[mpx_events->num_events + num_events_success] = mev;
        mpx_events->mev[mpx_events->num_events + num_events_success]->uses++;
        num_events_success++;
 
    }
 
    /* Always be sure the head master event points to the thread */
    if ( *head != NULL ) {
        ( *head )->mythr = mpx_events->mythr;
    }
    MPXDBG( "%d of %d events were added.\n", num_events_success, num_events );
    mpx_events->num_events += num_events_success;
    return ( PAPI_OK );
 
  bail:
    /* If there is a current mev, it is currently not linked into the list
     * of multiplexing events, so we can just delete that
     */
    if ( mev && mev->papi_event ) {
       if (PAPI_cleanup_eventset( mev->papi_event )!=PAPI_OK) {
         PAPIERROR("Cleanup eventset\n");
       }
       if (PAPI_destroy_eventset( &( mev->papi_event )) !=PAPI_OK) {
         PAPIERROR("Destroy eventset\n");
       }
    }
    if ( mev )
        papi_free( mev );
    mev = NULL;
 
    /* Decrease the usage count of events */
    for ( i = 0; i < num_events_success; i++ ) {
        mpx_events->mev[mpx_events->num_events + i]->uses--;
    }
 
    /* Run the garbage collector to remove unused events */
    if ( num_events_success )
        mpx_remove_unused( head );
 
    return ( retval );
}

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mpx_malloc()

static MPX_EventSet * mpx_malloc ( Threadlist *  t )

static

Definition at line 292 of file sw_multiplex.c.

{
    MPX_EventSet *newset =
        ( MPX_EventSet * ) papi_malloc( sizeof ( MPX_EventSet ) );
    if ( newset == NULL )
        return ( NULL );
    memset( newset, 0, sizeof ( MPX_EventSet ) );
    newset->status = MPX_STOPPED;
    newset->mythr = t;
    return ( newset );
}

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MPX_read()

int MPX_read	(	MPX_EventSet *	mpx_events,
		long long *	values,
		int	called_by_stop
	)

Definition at line 823 of file sw_multiplex.c.

{
    int i;
    int retval;
    long long last_value[2];
    long long cycles_this_slice = 0;
    MasterEvent *cur_event;
    Threadlist *thread_data;
 
    if ( mpx_events->status == MPX_RUNNING ) {
 
        /* Hold timer interrupts while we read values */
        mpx_hold(  );
 
        thread_data = mpx_events->mythr;
        cur_event = thread_data->cur_event;
 
        retval = PAPI_read( cur_event->papi_event, last_value );
        if ( retval != PAPI_OK )
            return retval;
 
        cycles_this_slice = ( cur_event->pi.event_type == SCALE_EVENT )
            ? last_value[0] : last_value[1];
 
        /* Save the current counter values and get
         * the lastest data for the current event
         */
        for ( i = 0; i < mpx_events->num_events; i++ ) {
            MasterEvent *mev = mpx_events->mev[i];
 
            if ( !( mev->is_a_rate ) ) {
                mpx_events->stop_values[i] = mev->count_estimate;
            }
            else {
                mpx_events->stop_values[i] = mev->count;
            }
#ifdef MPX_NONDECR_HYBRID
            /* If we are called from MPX_stop() then      */
                        /* adjust the final values based on the       */
                        /* cycles elapsed since the last read         */
                        /* otherwise, don't do this as it can cause   */
                        /* decreasing values if read is called again  */
                        /* before another sample happens.             */
 
                        if (called_by_stop) {
 
               /* Extrapolate data up to the current time 
                * only if it's not a rate measurement 
                */
               if ( !( mev->is_a_rate ) ) {
                  if ( mev != thread_data->cur_event ) {
                 mpx_events->stop_values[i] +=
                        ( long long ) ( mev->rate_estimate *
                                        ( cycles_this_slice +
                                          thread_data->total_c -
                                          mev->prev_total_c ) );
                 MPXDBG
                        ( "%s:%d:: Inactive %d, stop values=%lld (est. %lld, rate %g, cycles %lld)\n",
                          __FILE__, __LINE__, i, mpx_events->stop_values[i],
                          mev->count_estimate, mev->rate_estimate,
                          cycles_this_slice + thread_data->total_c -
                          mev->prev_total_c );
                  } else {
                 mpx_events->stop_values[i] += last_value[0] +
                        ( long long ) ( mev->rate_estimate *
                                        ( thread_data->total_c -
                                          mev->prev_total_c ) );
                 MPXDBG
                        ( "%s:%d:: -Active- %d, stop values=%lld (est. %lld, rate %g, cycles %lld)\n",
                          __FILE__, __LINE__, i, mpx_events->stop_values[i],
                          mev->count_estimate, mev->rate_estimate,
                          thread_data->total_c - mev->prev_total_c );
                  }
               }
            }
#endif
        }
 
        mpx_events->stop_c = thread_data->total_c + cycles_this_slice;
 
        /* Restore the interrupt */
        mpx_release(  );
    }
 
    /* Store the values in user array. */
    for ( i = 0; i < mpx_events->num_events; i++ ) {
        MasterEvent *mev = mpx_events->mev[i];
        long long elapsed_slices = 0;
        long long elapsed_values = mpx_events->stop_values[i]
            - mpx_events->start_values[i];
 
        /* For rates, cycles contains the number of measurements,
         * not the number of cycles, so just divide to compute
         * an average value.  This assumes that the rate was
         * constant over the whole measurement period.
         */
        values[i] = elapsed_values;
        if ( mev->is_a_rate ) {
            /* Handler counts */
            elapsed_slices = mev->cycles - mpx_events->start_hc[i];
            values[i] =
                elapsed_slices ? ( elapsed_values / elapsed_slices ) : 0;
        }
        MPXDBG( "%s:%d:: event %d, values=%lld ( %lld - %lld), cycles %lld\n",
                __FILE__, __LINE__, i,
                elapsed_values,
                mpx_events->stop_values[i], mpx_events->start_values[i],
                mev->is_a_rate ? elapsed_slices : 0 );
    }
 
    return PAPI_OK;
}

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mpx_release()

inline_static void mpx_release

(

void

)

Definition at line 187 of file sw_multiplex.c.

{
    MPXDBG( "signal released\n" );
    sigprocmask( SIG_UNBLOCK, &sigreset, NULL );
}

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mpx_remove_event()

int mpx_remove_event	(	MPX_EventSet **	mpx_events,
		int	EventCode
	)

Definition at line 418 of file sw_multiplex.c.

{
    mpx_hold(  );
    if ( *mpx_events )
        mpx_delete_one_event( *mpx_events, EventCode );
    mpx_release(  );
    return ( PAPI_OK );
}

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mpx_remove_unused()

static void mpx_remove_unused ( MasterEvent **  head )

static

Remove events that are not used any longer from the run list of events to multiplex by the handler MUST BE CALLED WITH THE SIGNAL HANDLER DISABLED

Definition at line 1403 of file sw_multiplex.c.

{
    MasterEvent *mev, *lastmev = NULL, *nextmev;
    Threadlist *thr = ( *head == NULL ) ? NULL : ( *head )->mythr;
    int retval;
 
    /* Clean up and remove unused master events. */
    for ( mev = *head; mev != NULL; mev = nextmev ) {
        nextmev = mev->next; /* get link before mev is freed */
        if ( !mev->uses ) {
            if ( lastmev == NULL ) {    /* this was the head event */
                *head = nextmev;
            } else {
                lastmev->next = nextmev;
            }
            retval=PAPI_cleanup_eventset( mev->papi_event );
            retval=PAPI_destroy_eventset( &( mev->papi_event ) );
            if (retval!=PAPI_OK) PAPIERROR("Error destroying event\n");
            papi_free( mev );
        } else {
            lastmev = mev;
        }
    }
 
    /* Always be sure the head master event points to the thread */
    if ( *head != NULL ) {
        ( *head )->mythr = thr;
    }
}

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MPX_reset()

int MPX_reset

(

MPX_EventSet *

mpx_events

)

Definition at line 937 of file sw_multiplex.c.

{
    int i, retval;
    long long values[PAPI_MAX_SW_MPX_EVENTS];
 
    /* Get the current values from MPX_read */
    retval = MPX_read( mpx_events, values, 0 );
    if ( retval != PAPI_OK )
        return retval;
 
    /* Disable timer interrupt */
    mpx_hold(  );
 
    /* Make counters read zero by setting the start values
     * to the current counter values.
     */
    for ( i = 0; i < mpx_events->num_events; i++ ) {
        MasterEvent *mev = mpx_events->mev[i];
 
        if ( mev->is_a_rate ) {
            mpx_events->start_values[i] = mev->count;
        } else {
            mpx_events->start_values[i] += values[i];
        }
        mpx_events->start_hc[i] = mev->cycles;
    }
 
    /* Set the start time for this set to the current cycle count */
    mpx_events->start_c = mpx_events->stop_c;
 
    /* Restart the interrupt */
    mpx_release(  );
 
    return PAPI_OK;
}

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mpx_restore_signal()

static void mpx_restore_signal ( void  )

static

Definition at line 247 of file sw_multiplex.c.

{
    MPXDBG( "restore signal\n" );
    if ( _papi_os_info.itimer_sig != PAPI_NULL ) {
        if ( signal( _papi_os_info.itimer_sig, SIG_IGN ) == SIG_ERR )
            PAPIERROR( "sigaction stop errno %d", errno );
    }
}

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MPX_shutdown()

void MPX_shutdown

(

void

)

Definition at line 1102 of file sw_multiplex.c.

{
    MPXDBG( "%d\n", getpid(  ) );
    mpx_shutdown_itimer(  );
    mpx_restore_signal(  );
 
    if ( tlist ) {
           Threadlist *next,*t=tlist;
 
        while(t!=NULL) {
           next=t->next;
           papi_free( t );
           t = next;            
        }
        tlist = NULL;
    }
}

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mpx_shutdown_itimer()

static void mpx_shutdown_itimer ( void  )

static

Definition at line 257 of file sw_multiplex.c.

{
    MPXDBG( "setitimer off\n" );
    if ( _papi_os_info.itimer_num != PAPI_NULL ) {
        if ( setitimer( _papi_os_info.itimer_num,
               ( struct itimerval * ) &itimestop, NULL ) == -1 )
            PAPIERROR( "setitimer stop errno %d", errno );
    }
}

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MPX_start()

int MPX_start

(

MPX_EventSet *

mpx_events

)

Definition at line 692 of file sw_multiplex.c.

{
    int retval = PAPI_OK;
    int i;
    long long values[2];
    long long cycles_this_slice, current_thread_mpx_c = 0;
    Threadlist *t;
 
    t = mpx_events->mythr;
 
    mpx_hold(  );
 
    if ( t->cur_event && t->cur_event->active ) {
        current_thread_mpx_c += t->total_c;
        retval = PAPI_read( t->cur_event->papi_event, values );
        assert( retval == PAPI_OK );
        if ( retval == PAPI_OK ) {
            cycles_this_slice = ( t->cur_event->pi.event_type == SCALE_EVENT )
                ? values[0] : values[1];
        } else {
            values[0] = values[1] = 0;
            cycles_this_slice = 0;
        }
 
    } else {
        values[0] = values[1] = 0;
        cycles_this_slice = 0;
    }
 
    /* Make all events in this set active, and for those
     * already active, get the current count and cycles.
     */
    for ( i = 0; i < mpx_events->num_events; i++ ) {
        MasterEvent *mev = mpx_events->mev[i];
 
        if ( mev->active++ ) {
            mpx_events->start_values[i] = mev->count_estimate;
            mpx_events->start_hc[i] = mev->cycles;
 
            /* If this happens to be the currently-running
             * event, add in the current amounts from this
             * time slice.  If it's a rate, though, don't
             * bother since the event might not have been
             * running long enough to get an accurate count.
             */
            if ( t->cur_event && !( t->cur_event->is_a_rate ) ) {
#ifdef MPX_NONDECR_HYBRID
                if ( mev != t->cur_event ) {    /* This event is not running this slice */
                    mpx_events->start_values[i] +=
                        ( long long ) ( mev->rate_estimate *
                                        ( cycles_this_slice + t->total_c -
                                          mev->prev_total_c ) );
                } else {     /* The event is running, use current value + estimate */
                    if ( cycles_this_slice >= MPX_MINCYC )
                        mpx_events->start_values[i] += values[0] + ( long long )
                            ( ( values[0] / ( double ) cycles_this_slice ) *
                              ( t->total_c - mev->prev_total_c ) );
                    else     /* Use previous rate if the event has run too short time */
                        mpx_events->start_values[i] += values[0] + ( long long )
                            ( mev->rate_estimate *
                              ( t->total_c - mev->prev_total_c ) );
                }
#endif
            } else {
                mpx_events->start_values[i] = mev->count;
            }
        } else {
            /* The = 0 isn't actually necessary; we only need
             * to sync up the mpx event to the master event,
             * but it seems safe to set the mev to 0 here, and
             * that gives us a change to avoid (very unlikely)
             * rollover problems for events used repeatedly over
             * a long time.
             */
            mpx_events->start_values[i] = 0;
            mpx_events->stop_values[i] = 0;
            mpx_events->start_hc[i] = mev->cycles = 0;
            mev->count_estimate = 0;
            mev->rate_estimate = 0.0;
            mev->prev_total_c = current_thread_mpx_c;
            mev->count = 0;
        }
        /* Adjust start value to include events and cycles
         * counted previously for this event set.
         */
    }
 
    mpx_events->status = MPX_RUNNING;
 
    /* Start first counter if one isn't already running */
    if ( t->cur_event == NULL ) {
        /* Pick an events at random to start. */
        int index = ( rand_r( &randomseed ) % mpx_events->num_events );
        t->cur_event = mpx_events->mev[index];
        t->total_c = 0;
        t->cur_event->prev_total_c = 0;
        mpx_events->start_c = 0;
        retval = PAPI_start( mpx_events->mev[index]->papi_event );
        assert( retval == PAPI_OK );
    } else {
        /* If an event is already running, record the starting cycle
         * count for mpx_events, which is the accumlated cycle count
         * for the master event set plus the cycles for this time
         * slice.
         */
        mpx_events->start_c = t->total_c + cycles_this_slice;
    }
 
#if defined(DEBUG)
    if ( ISLEVEL( DEBUG_MULTIPLEX ) ) {
        MPXDBG( "%s:%d:: start_c=%lld  thread->total_c=%lld\n", __FILE__,
                __LINE__, mpx_events->start_c, t->total_c );
        for ( i = 0; i < mpx_events->num_events; i++ ) {
            MPXDBG
                ( "%s:%d:: start_values[%d]=%lld  estimate=%lld rate=%g last active=%lld\n",
                  __FILE__, __LINE__, i, mpx_events->start_values[i],
                  mpx_events->mev[i]->count_estimate,
                  mpx_events->mev[i]->rate_estimate,
                  mpx_events->mev[i]->prev_total_c );
        }
    }
#endif
 
    mpx_release(  );
 
    retval = mpx_startup_itimer(  );
 
    return retval;
}

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mpx_startup_itimer()

static int mpx_startup_itimer ( void  )

static

Definition at line 222 of file sw_multiplex.c.

{
    struct sigaction sigact;
 
    /* Set up the signal handler and the timer that triggers it */
 
    MPXDBG( "PID %d\n", getpid(  ) );
    memset( &sigact, 0, sizeof ( sigact ) );
    sigact.sa_flags = SA_RESTART;
    sigact.sa_handler = mpx_handler;
 
    if ( sigaction( _papi_os_info.itimer_sig, &sigact, NULL ) == -1 ) {
        PAPIERROR( "sigaction start errno %d", errno );
        return PAPI_ESYS;
    }
 
    if ( setitimer( _papi_os_info.itimer_num, &itime, NULL ) == -1 ) {
        sigaction( _papi_os_info.itimer_sig, &oaction, NULL );
        PAPIERROR( "setitimer start errno %d", errno );
        return PAPI_ESYS;
    }
    return ( PAPI_OK );
}

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MPX_stop()

int MPX_stop	(	MPX_EventSet *	mpx_events,
		long long *	values
	)

Definition at line 974 of file sw_multiplex.c.

{
    int i, cur_mpx_event;
    int retval = PAPI_OK;
    long long dummy_value[2];
    long long dummy_mpx_values[PAPI_MAX_SW_MPX_EVENTS];
    /* long long cycles_this_slice, total_cycles; */
    MasterEvent *cur_event = NULL, *head;
    Threadlist *thr = NULL;
 
    if ( mpx_events == NULL )
        return PAPI_EINVAL;
    if ( mpx_events->status != MPX_RUNNING )
        return PAPI_ENOTRUN;
 
    /* Read the counter values, this updates mpx_events->stop_values[] */
    MPXDBG( "Start\n" );
    if ( values == NULL )
      retval = MPX_read( mpx_events, dummy_mpx_values, 1 );
    else
      retval = MPX_read( mpx_events, values, 1 );
 
    /* Block timer interrupts while modifying active events */
    mpx_hold(  );
 
    /* Get the master event list for this thread. */
    head = get_my_threads_master_event_list(  );
    if (!head) {
      retval=PAPI_EBUG;
      goto exit_mpx_stop;
    }
 
    /* Get this threads data structure */
    thr = head->mythr;
    cur_event = thr->cur_event;
 
    /* This would be a good spot to "hold" the counter and then restart
     * it at the end, but PAPI_start resets counters so it is not possible
     */
 
    /* Run through all the events decrement their activity counters. */
    cur_mpx_event = -1;
    for ( i = 0; i < mpx_events->num_events; i++ ) {
        --mpx_events->mev[i]->active;
        if ( mpx_events->mev[i] == cur_event )
            cur_mpx_event = i;
    }
 
    /* One event in this set is currently running, if this was the
     * last active event set using this event, we need to start the next 
     * event if there still is one left in the queue
     */
    if ( cur_mpx_event > -1 ) {
        MasterEvent *tmp, *mev = mpx_events->mev[cur_mpx_event];
 
        if ( mev->active == 0 ) {
            /* Event is now inactive; stop it 
             * There is no need to update master event set 
             * counters as this is the last active user
             */
            retval = PAPI_stop( mev->papi_event, dummy_value );
            mev->rate_estimate = 0.0;
 
            /* Fall-back value if none is found */
            thr->cur_event = NULL;
            /* Now find a new cur_event */
            for ( tmp = ( cur_event->next == NULL ) ? head : cur_event->next;
                  tmp != cur_event;
                  tmp = ( tmp->next == NULL ) ? head : tmp->next ) {
                if ( tmp->active ) {    /* Found the next one to start */
                    thr->cur_event = tmp;
                    break;
                }
            }
 
            if ( thr->cur_event != NULL ) {
                retval = PAPI_start( thr->cur_event->papi_event );
                assert( retval == PAPI_OK );
            } else {
                mpx_shutdown_itimer(  );
            }
        }
    }
    mpx_events->status = MPX_STOPPED;
 
exit_mpx_stop:
    MPXDBG( "End\n" );
 
    /* Restore the timer (for other event sets that may be running) */
    mpx_release(  );
 
    return retval;
}

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Variable Documentation

itime

struct itimerval itime

static

Definition at line 152 of file sw_multiplex.c.

itimestop

const struct itimerval itimestop = { {0, 0}, {0, 0} }

static

Definition at line 153 of file sw_multiplex.c.

oaction

struct sigaction oaction

static

Definition at line 154 of file sw_multiplex.c.

randomseed

unsigned int randomseed

static

Definition at line 141 of file sw_multiplex.c.

sigreset

sigset_t sigreset

static

Definition at line 151 of file sw_multiplex.c.

tlist

Threadlist* tlist = NULL

static

List of threads that are multiplexing.

Definition at line 140 of file sw_multiplex.c.