appio_test_read_write.c File Reference

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Macros
#define	NUM_EVENTS   12

Functions
int	main (int argc, char **argv)

Macro Definition Documentation

NUM_EVENTS

#define NUM_EVENTS   12

Definition at line 22 of file appio_test_read_write.c.

Function Documentation

main()

int main	(	int	argc,
		char **	argv
	)

Definition at line 24 of file appio_test_read_write.c.

                                {
  int EventSet = PAPI_NULL;
  const char* names[NUM_EVENTS] = {"OPEN_CALLS", "OPEN_FDS", "READ_CALLS", "READ_BYTES", "READ_USEC", "READ_ERR", "READ_INTERRUPTED", "READ_WOULD_BLOCK", "WRITE_CALLS","WRITE_BYTES","WRITE_USEC","WRITE_WOULD_BLOCK"};
  long long values[NUM_EVENTS];
 
  char *infile = "/etc/group";
 
  /* Set TESTS_QUIET variable */
  tests_quiet( argc, argv );
 
  int version = PAPI_library_init (PAPI_VER_CURRENT);
  if (version != PAPI_VER_CURRENT) {
    fprintf(stderr, "PAPI_library_init version mismatch\n");
    exit(1);
  }
 
  /* Create the Event Set */
  if (PAPI_create_eventset(&EventSet) != PAPI_OK) {
    fprintf(stderr, "Error creating event set\n");
      exit(2);
  }
 
  int fdin;
  if (!TESTS_QUIET) printf("This program will read %s and write it to /dev/null\n", infile);
  int retval;
  int e;
  int event_code;
  for (e=0; e<NUM_EVENTS; e++) {
    retval = PAPI_event_name_to_code((char*)names[e], &event_code);
    if (retval != PAPI_OK) {
      fprintf(stderr, "Error getting code for %s\n", names[e]);
      exit(2);
    }
    retval = PAPI_add_event(EventSet, event_code);
    if (retval != PAPI_OK) {
      fprintf(stderr, "Error adding %s to event set\n", names[e]);
      exit(2);
    }
  }
 
  /* Start counting events */
  if (PAPI_start(EventSet) != PAPI_OK) {
    fprintf(stderr, "Error in PAPI_start\n");
    exit(1);
  }
 
  fdin=open(infile, O_RDONLY);
  if (fdin < 0) perror("Could not open file for reading: \n");
  int fdout;
  fdout=open("/dev/null", O_WRONLY);
  if (fdout < 0) perror("Could not open file for writing: \n");
  int bytes = 0;
  char buf[1024];
 
 
//if (PAPI_read(EventSet, values) != PAPI_OK)
//   handle_error(1);
//printf("After reading the counters: %lld\n",values[0]);
 
  while ((bytes = read(fdin, buf, 1024)) > 0) {
    write(fdout, buf, bytes);
  }
 
  /* Closing the descriptors before doing the PAPI_stop
     means, OPEN_FDS will be reported as zero, which is
     right, since at the time of PAPI_stop, the descriptors
     we opened have been closed */
  close (fdin);
  close (fdout);
 
  /* Stop counting events */
  if (PAPI_stop(EventSet, values) != PAPI_OK) {
    fprintf(stderr, "Error in PAPI_stop\n");
  }
 
  if (!TESTS_QUIET) {
    printf("----\n");
    for (e=0; e<NUM_EVENTS; e++)
      printf("%s: %lld\n", names[e], values[e]);
  }
  test_pass( __FILE__ );
  return 0;
}

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