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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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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) 					  System Administration Commands					   cachefsstat(1M)

NAME
cachefsstat - Cache File System statistics SYNOPSIS
/usr/bin/cachefsstat [-z] [path...] DESCRIPTION
The cachefsstat command displays statistical information about the cache file system mounted on path. The statistical information includes cache hits and misses, consistency checking, and modification operations. If path is not specified, all mounted cache file systems are used. cachefsstat can also be used to reinitialize this information (see -z option). The statistical information has the following format: <cache hit rate> <consistency checks> <modifies> where: 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, etc. OPTIONS
The following option is supported: -z Zero (reinitialize) statistics. Execute cachefsstat -z before executing cachefsstat again to gather statistics on the cache per- formance. This option can only be use by the superuser. The statistics printed reflect those just before the statistics are reinitialized. USAGE
See largefile(5) for the description of the behavior of cachefsstat when encountering files greater than or equal to 2 Gbyte (2**31 bytes). EXAMPLES
Example 1: Using cachefsstat The following example shows the cachefsstat command run on file system /test: example# cachefsstat /test /test cache hit rate: 100% (0 hits, 0 misses) consistency checks: 0 (0 pass, 0 fail) modifies: 0 garbage collection: 0 EXIT STATUS
The following exit values are returned: 0 Successful completion. non-zero An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
cachefslog(1M), cachefswssize(1M), cfsadmin(1M), attributes(5), largefile(5) SunOS 5.10 9 Oct 2003 cachefsstat(1M)

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