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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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LEARN ABOUT LINUX

thread-keyring

THREAD-KEYRING(7)					     Linux Programmer's Manual						 THREAD-KEYRING(7)

NAME

       thread-keyring - per-thread keyring

DESCRIPTION

       The  thread  keyring  is  a  keyring used to anchor keys on behalf of a process.  It is created only when a thread requests it.	The thread
       keyring has the name (description) _tid.

       A special serial number value, KEY_SPEC_THREAD_KEYRING, is defined that can be used in lieu of the actual  serial  number  of  the  calling
       thread's thread keyring.

       From  the  keyctl(1)  utility,  '@t'  can be used instead of a numeric key ID in much the same way, but as keyctl(1) is a program run after
       forking, this is of no utility.

       Thread keyrings are not inherited across clone(2) and fork(2) and are cleared by execve(2).  A thread keyring is destroyed when the  thread
       that refers to it terminates.

       Initially, a thread does not have a thread keyring.  If a thread doesn't have a thread keyring when it is accessed, then it will be created
       if it is to be modified; otherwise the operation fails with the error ENOKEY.

SEE ALSO

       keyctl(1), keyctl(3), keyrings(7), persistent-keyring(7), process-keyring(7), session-keyring(7), user-keyring(7), user-session-keyring(7)

Linux								    2017-03-13							 THREAD-KEYRING(7)
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