How to interpret Papi output


 
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Special Forums UNIX and Linux Applications High Performance Computing How to interpret Papi output
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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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cachefsstat(1M) 														   cachefsstat(1M)

NAME
cachefsstat - Cache File System statistics SYNOPSIS
path... ] DESCRIPTION
The command displays statistical information about the cache filesystem mounted on path. The statistical information includes cache hits and misses, consistency checking, and modification operations. If path is not specified, all mounted cache filesystems are used. can also be used to reinitialize this information (see description for the option). The statistical information has the following format: <cache hit rate> <consistency checks> <modifies> where each of the above is defined as: cache hit rate The percentage of cache hits over the total number of attempts followed by the actual numbers of hits and misses. consistency checks The number of consistency checks performed followed by the number that passed and the number that failed. modifies The number of modify operations, including writes, creates, and so on. Options recognizes the following option: Zero (reinitialize) statistics. Execute before executing again to gather statistics on the cache performance. This option can only be used by the supe- ruser. The statistics printed reflect those just before the statistics are reinitialized. RETURN VALUE
returns the following values: Success. non-zero An error occurred. EXAMPLES
AUTHOR
was developed by Sun Microsystems, Inc. SEE ALSO
cfsadmin(1M). cachefsstat(1M)