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Full Discussion: How to interpret Papi output
Special Forums UNIX and Linux Applications High Performance Computing How to interpret Papi output Post 302441434 by vishwamitra on Friday 30th of July 2010 04:56:28 PM
Old 07-30-2010
How to interpret Papi output

I have collected data of Number of L2 cache misses using PAPI. I had run an MPI application with 4 threads (mpirun -np 4) and each thread reads the cache misses in L2. Each thread outputs data for every timestamp. eg:
Code:
 Timestamp              data
xxx530     thread# 0   2136
xxx531     thread# 0   3217
..           .          .
.            .          . 
.            .          .
.            .          .
xxx550      thread# 0   412334255

xxx530      thread #1    2456
xxx531      thread#1     4243
xxx532      thread #1    4567 
and so on

Now my qstn , is whether i shud add all the cache miss values at time stamp xxx530 for thread 0,1, 2 and 3 OR shud i take the max-value for thrreda0,1,2,3 for timestamp xxx530 ?
 

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PTHREAD_DETACH(3)					   BSD Library Functions Manual 					 PTHREAD_DETACH(3)

NAME
pthread_detach -- detach a thread SYNOPSIS
#include <pthread.h> int pthread_detach(pthread_t thread); DESCRIPTION
The pthread_detach() function is used to indicate to the implementation that storage for the thread thread can be reclaimed when the thread terminates. If thread has not terminated, pthread_detach() will not cause it to terminate. The effect of multiple pthread_detach() calls on the same target thread is unspecified. RETURN VALUES
If successful, the pthread_detach() function will return zero. Otherwise an error number will be returned to indicate the error. Note that the function does not change the value of errno as it did for some drafts of the standard. These early drafts also passed a pointer to pthread_t as the argument. Beware! ERRORS
The pthread_detach() function will fail if: [EINVAL] The implementation has detected that the value specified by thread does not refer to a joinable thread. [ESRCH] No thread could be found corresponding to that specified by the given thread ID, thread. SEE ALSO
pthread_join(3) STANDARDS
The pthread_detach() function conforms to ISO/IEC 9945-1:1996 (``POSIX.1''). BSD
April 4, 1996 BSD
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