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lib: Convert RUSAGE_SELF to RUSAGE_THREAD where we can

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When using getrusage, we have multiple choices about what
to call for data gathering about this particular thread of execution.

RUSAGE_SELF -> This means gather all cpu run time for all pthreads associated
with this process.

RUSAGE_THREAD -> This means gather all cpu run time for this particular
pthread.

Clearly with data gathering for slow thread as well as `show thread cpu`
it would be preferable to gather only data about the current running
pthread.  This probably was the original behavior of using RUSAGE_SELF
when we didn't have multiple pthreads.  So it didn't matter so much.

Prior to this change, 10 iterations of 1 million routes install/remove
from zebra would give us this cpu time for the dataplane pthread:

Showing statistics for pthread Zebra dplane thread
--------------------------------------------------
                      CPU (user+system): Real (wall-clock):
Active   Runtime(ms)   Invoked Avg uSec Max uSecs Avg uSec Max uSecs  Type  Thread
    0     280902.149    326541      860   2609982      550   2468910    E  dplane_thread_loop

After this change we are seeing this:

Showing statistics for pthread Zebra dplane thread
--------------------------------------------------
                      CPU (user+system): Real (wall-clock):
Active   Runtime(ms)   Invoked Avg uSec Max uSecs Avg uSec Max uSecs  Type  Thread
    0      58045.560    334944      173    277226      539   2502268    E  dplane_thread_loop

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2019-01-09 12:18:21 -05:00
parent 17c7cb4acd
commit 231db9a6e1
1 changed files with 6 additions and 1 deletions
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7
lib/thread.c
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@ -1572,8 +1572,13 @@ void thread_set_yield_time(struct thread *thread, unsigned long yield_time)
void thread_getrusage(RUSAGE_T *r)
{
#if defined RUSAGE_THREAD
#define FRR_RUSAGE RUSAGE_THREAD
#else
#define FRR_RUSAGE RUSAGE_SELF
#endif
monotime(&r->real);
getrusage(RUSAGE_SELF, &(r->cpu));
getrusage(FRR_RUSAGE, &(r->cpu));
}
/*