Hi,
I may well be doing something wrong here, but the code below doesn't do
what I expect. It works fine when compiled with a 32 bit compiler, but
'behaves interestingly' when compiled in 64 bit mode.
I'm running RH EL3 on a dual cpu, dual core AMD system and the plpa
routines seem to think I have 8 logical cpus, whereas I only have 4.
The output when compiled in 64 bit mode is:
[davidc_at_frill tmp]$ ./a.out
Size = 128 - CPU_SETSIZE = 1024
0 - 1
1 - 1
2 - 1
3 - 1
Now for plpa
0 - 1
1 - 1
2 - 1
3 - 1
32 - 1
33 - 1
34 - 1
35 - 1
whereas in 32 bit mode (same system, same compiler) I get:
[davidc_at_frill tmp]$ ./a.out
Size = 128 - CPU_SETSIZE = 1024
0 - 1
1 - 1
2 - 1
3 - 1
Now for plpa
0 - 1
1 - 1
2 - 1
3 - 1
Thanks in advance for any help you can offer.
David
#include <stdio.h>
#include <sched.h>
#include <plpa.h>
int main()
{
cpu_set_t mask;
printf("Size = %ld - CPU_SETSIZE = %d\n", sizeof(mask), CPU_SETSIZE);
sched_getaffinity(0, &mask);
for (int i=0; i < CPU_SETSIZE; i++) {
if (CPU_ISSET(i, &mask)) {
printf("%d - 1\n", i);
}
}
printf("\nNow for plpa\n");
plpa_cpu_set_t cpuset;
PLPA_CPU_ZERO(&cpuset);
int ret = plpa_sched_getaffinity(0, sizeof(cpuset), &cpuset);
if (ret == 0)
{
for (int i=0; i < PLPA_BITMASK_CPU_MAX; i++) {
if (PLPA_CPU_ISSET(i, &cpuset)) {
printf("%d - 1\n", i);
}
}
}
}
--
David Creasy
Matrix Science
64 Baker Street
London W1U 7GB, UK
Tel: +44 (0)20 7486 1050
Fax: +44 (0)20 7224 1344
dcreasy_at_[hidden]
http://www.matrixscience.com
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