Hi Mark
I have written a test case that consistently demonstrates this problem.
Using this program:
>cat ForkTest.cpp
#include <stdio.h>
#include <stdlib.h>
main (int argc, char **argv) {
int i, j, k;
printf ("Start test\n");
system("ls -al");
for (i=0 ; i<1000 ; i++) {
if ((i % 100) == 0) {
printf ("Doing loop %d\n", i);
}
for (j=0 ; j<1000000 ; j++) {
k = j * i;
}
}
printf ("End test\n");
}
I compile it with:
gcc -g -o ./FortTest. ./FortTest.cpp
I then run HPCToolkit and pfmon on it with the commands:
hpcrun -e CPU_OP_CYCLES_ALL:32767 -o ./hpcrun.data -- ./FortTest >./hpcrun
2>./hpcrun.debug
hpcprof --debug 5 ./FortTest ./hpcrun.data/* >./hpcprof 2>./hpcprof.debug
pfmon --debug --follow-fork -v -e CPU_OP_CYCLES_ALL ./FortTest >pfmon
2>pfmon.debug
The hpcrun data files created are:
-rw-r--r-- 1 hpctk users 1666 May 13 16:06
bash.CPU_OP_CYCLES_ALL.molson.19755.0x4d2b
-rw-r--r-- 1 hpctk users 1164 May 13 16:06
ForkTest.CPU_OP_CYCLES_ALL.molson.19754.0x4d2a
-rw-r--r-- 1 hpctk users 2200 May 13 16:06
ls.CPU_OP_CYCLES_ALL.molson.19755.0x4d2b
The results in the file ./hpcprof show :
Columns correspond to the following events [event:period (events/sample)]
CPU_OP_CYCLES_ALL:32767 - CPU Operating Cycles -- All CPU cycles counted
(35 samples)
CPU_OP_CYCLES_ALL:32767 - CPU Operating Cycles -- All CPU cycles counted
(0 samples)
CPU_OP_CYCLES_ALL:32767 - CPU Operating Cycles -- All CPU cycles counted
(38 samples)
CPU_OP_CYCLES_ALL (min):32767 - CPU Operating Cycles -- All CPU cycles
counted (The minimum for events of this type.) (0 samples) [not shown]
CPU_OP_CYCLES_ALL (max):32767 - CPU Operating Cycles -- All CPU cycles
counted (The maximum for events of this type.) (63 samples) [not shown]
CPU_OP_CYCLES_ALL (sum):32767 - CPU Operating Cycles -- All CPU cycles
counted (Summed over all events of this type.) (73 samples) [not shown]
The multiplication of samples times period (73 * 32767) give me:
2,391,991 Cpu cycles used
But the results in the file ./pfmon show:
26,045,577,230 CPU_OP_CYCLES_ALL
The test actually runs about 20 seconds on my system which makes the number
reported by pfmon appear to be accurate.
If I comment out the line (to rerun the test without the fork):
system("ls -al");
Then recompile and rerun the test:
The only hpcrun data file created is:
-rw-r--r-- 1 hpctk users 1392 May 13 16:09
ForkTest.CPU_OP_CYCLES_ALL.molson.19814.0x4d66
The results in the file ./hpcprof show :
Columns correspond to the following events [event:period (events/sample)]
CPU_OP_CYCLES_ALL:32767 - CPU Operating Cycles -- All CPU cycles counted
(795988 samples)
Which represents:
26,082,138,796 Cpu cycles used
The pfmon results for this test run reports:
26,045,163,278 CPU_OP_CYCLES_ALL
It is clear from these test results that hpcrun does not work correctly for
this type of executable and the problem is now easily reproducable.
I do not know if the workaround you have considered is the best way to fix
this or if the PAPI fix is a better way to go. But if you guys can point
me
in the right direction and give me an idea what needs to be changed, I am
willing to try and implement the fix. I just want to come up with a
correction
that someone with the authority to commit changes to the CVS/SVN would be
willing to put into a future release.
Thanks for your time,
Gary
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