Hi,
I am looking to measure how long a thread takes to migrate between cpu's and
how often , what I have is below which is checking just one process is this the
correct track to be on here?
My aim is to look at a process and look at upping the reboose_interval on some
of our servers.
#!/usr/sbin/dtrace -s
sched:::off-cpu
{
self->cpu = cpu;
self->timestamp=timestamp;
}
sched:::on-cpu /self->cpu != cpu && execname=="mstragent"/
{
printf("%s migrated from cpu %d to cpu %d nsec:%d
\n",execname,self->cpu,cpu,timestamp-self->timestamp);
printf("%s migrated from cpu %d to cpu %d ms:%d
\n",execname,self->cpu,cpu,(timestamp-self->timestamp)/1000000);
self->cpu = 0;
self->timestamp = 0;
}
Sample output is as follows
dtrace: script './migr.d' matched 3 probes
CPU ID FUNCTION:NAME
1 782 resume:on-cpu mstragent migrated from cpu 0 to
cpu 1 nsec:1123786101964690
mstragent migrated from cpu 0 to cpu 1 ms:1123786101
0 782 resume:on-cpu mstragent migrated from cpu 1 to
cpu 0 nsec:38049334
mstragent migrated from cpu 1 to cpu 0 ms:38
0 782 resume:on-cpu mstragent migrated from cpu 1 to
cpu 0 nsec:39942749
mstragent migrated from cpu 1 to cpu 0 ms:39
0 782 resume:on-cpu mstragent migrated from cpu 1 to
cpu 0 nsec:40069916
mstragent migrated from cpu 1 to cpu 0 ms:40
0 782 resume:on-cpu mstragent migrated from cpu 1 to
cpu 0 nsec:39936750
mstragent migrated from cpu 1 to cpu 0 ms:39
0 782 resume:on-cpu mstragent migrated from cpu 1 to
cpu 0 nsec:39991167
mstragent migrated from cpu 1 to cpu 0 ms:39
0 782 resume:on-cpu mstragent migrated from cpu 1 to
cpu 0 nsec:40012583
mstragent migrated from cpu 1 to cpu 0 ms:40
0 782 resume:on-cpu mstragent migrated from cpu 1 to
cpu 0 nsec:39956000
mstragent migrated from cpu 1 to cpu 0 ms:39
0 782 resume:on-cpu mstragent migrated from cpu 1 to
cpu 0 nsec:39970999
mstragent migrated from cpu 1 to cpu 0 ms:39
Thanks
Al
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