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From 0d743a7d946fe176a07baf2586a6af0e867fd89c Mon Sep 17 00:00:00 2001
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From: H.J. Lu <hongjiu.lu@intel.com>
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Date: Wed, 11 May 2011 16:19:55 +0200
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Subject: [PATCH] Recompute CPU usage at microsecond level
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If job finishes quickly, miliseconds arithmetic rounds to zero. If
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that happens, recalculate CPU usage ratio with microsecond accuracy
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to raise chance to get non-zero values.
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---
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resuse.h | 2 ++
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time.c | 15 +++++++++++++++
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2 files changed, 17 insertions(+), 0 deletions(-)
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diff --git a/resuse.h b/resuse.h
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index 992143f..7a3ee66 100644
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--- a/resuse.h
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+++ b/resuse.h
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@@ -33,9 +33,11 @@ struct timeval
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#if HAVE_SYS_RUSAGE_H
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/* This rusage structure measures nanoseconds instead of microseconds. */
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# define TV_MSEC tv_nsec / 1000000
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+# define TV_USEC tv_nsec / 1000
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# include <sys/rusage.h>
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#else
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# define TV_MSEC tv_usec / 1000
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+# define TV_USEC tv_usec
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# if HAVE_WAIT3
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# include <sys/resource.h>
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# else
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diff --git a/time.c b/time.c
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index 43aec0b..96cfdde 100644
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--- a/time.c
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+++ b/time.c
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@@ -326,6 +326,8 @@ summarize (fp, fmt, command, resp)
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{
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unsigned long r; /* Elapsed real milliseconds. */
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unsigned long v; /* Elapsed virtual (CPU) milliseconds. */
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+ unsigned long ru; /* Elapsed real microseconds. */
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+ unsigned long vu; /* Elapsed virtual (CPU) microseconds. */
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if (verbose)
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{
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@@ -350,6 +352,17 @@ summarize (fp, fmt, command, resp)
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v = resp->ru.ru_utime.tv_sec * 1000 + resp->ru.ru_utime.TV_MSEC +
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resp->ru.ru_stime.tv_sec * 1000 + resp->ru.ru_stime.TV_MSEC;
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+ if (r == 0 && v == 0)
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+ {
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+ ru = resp->elapsed.tv_usec;
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+ vu = resp->ru.ru_utime.TV_USEC + resp->ru.ru_stime.TV_USEC;
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+ }
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+ else
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+ {
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+ ru = 0;
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+ vu = 0;
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+ }
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+
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while (*fmt)
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{
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switch (*fmt)
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@@ -408,6 +421,8 @@ summarize (fp, fmt, command, resp)
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/* % cpu is (total cpu time)/(elapsed time). */
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if (r > 0)
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fprintf (fp, "%lu%%", (v * 100 / r));
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+ else if (ru > 0)
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+ fprintf (fp, "%lu%%", (vu * 100 / ru));
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else
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fprintf (fp, "?%%");
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break;
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--
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1.7.4.4
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