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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 HPUX

pthread_setschedprio

pthread_setschedprio(3T)												  pthread_setschedprio(3T)

NAME

       pthread_setschedprio() - sets scheduling priority of a thread

SYNOPSIS

PARAMETERS

	      thread	The thread whose scheduling priority is to be set.

	      prio	The new priority for the thread.

DESCRIPTION

       The function sets the scheduling priority of thread to the value prio.  If the function fails, the scheduling priority of the target thread
       is not changed.

RETURN VALUE

       Upon successful completion, returns zero.  Otherwise, an error number is returned to indicate the error (the variable is not set).

ERRORS

       If any of the following occur, the function returns the corresponding error number:

	      The value of   prio is invalid for the scheduling policy of the specified thread.

	      The implementation does not allow the application to modify the priority
			     to the value specified.

	      No thread could be found corresponding to
			     thread.

AUTHOR

       is derived from the IEEE Std 1003.1-2001.

SEE ALSO

       rtsched(2),  pthread_attr_setschedparam(3T),  pthread_attr_setschedpolicy(3T),  pthread_attr_getschedparam(3T),	 pthread_attr_getschedpol-
       icy(3T), pthread_setschedparam(3T), pthread_getschedparam(3T).

STANDARDS CONFORMANCE

								  Pthread Library					  pthread_setschedprio(3T)
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