Papi Read Access and L3

[volvicer]

Hi I have two questions about PAPI:

1.) What is the difference between a cache read and a cache access? How is the relation to a miss implemented?
2.) I sample PAPI on one socket with 4 cores and each core gather L3 cache misses. Finallay, I sum them up into one value. Is the the right way to do or do I get the same value four times?

Best regards