Revision: 1362
Author: [email protected]
Date: Thu Sep 16 11:03:07 2010
Log: Clarify the docs re clocks
http://code.google.com/p/perl-devel-nytprof/source/detail?r=1362
Modified:
/trunk/lib/Devel/NYTProf.pm
=======================================
--- /trunk/lib/Devel/NYTProf.pm Sun Sep 12 05:01:13 2010
+++ /trunk/lib/Devel/NYTProf.pm Thu Sep 16 11:03:07 2010
@@ -833,27 +833,25 @@
many timings. When using these clocks NYTProf outputs timings as a count
of 100
nanosecond ticks.
+=head3 CLOCK_MONOTONIC
+
+CLOCK_MONOTONIC represents the amount of time since an unspecified point in
+the past (typically system start-up time). It increments uniformly
+independent of adjustments to 'wallclock time'. NYTProf will use this
clock by
+default, if available.
+
=head3 CLOCK_REALTIME
CLOCK_REALTIME is typically the system's main high resolution 'wall clock
time'
source. The same source as used for the gettimeofday() call used by most
kinds
of perl benchmarking and profiling tools.
-If your system doesn't support clock_gettime() then NYTProf will use
-gettimeofday(), or the nearest equivalent,
-
The problem with real time is that it's far from simple. It tends to drift
and
then be reset to match 'reality', either sharply or by small adjustments
(via the
adjtime() system call).
Surprisingly, it can also go backwards, for reasons explained in
-http://preview.tinyurl.com/5wawnn
-
-=head3 CLOCK_MONOTONIC
-
-CLOCK_MONOTONIC represents the amount of time since an unspecified point in
-the past (typically system start-up time). It increments uniformly
-independent of adjustments to 'wallclock time'.
+http://preview.tinyurl.com/5wawnn so CLOCK_MONOTONIC is preferred.
=head3 CLOCK_VIRTUAL
@@ -887,6 +885,9 @@
This section lists other clock sources that NYTProf may use.
+If your system doesn't support clock_gettime() then NYTProf will use
+gettimeofday(), or the nearest equivalent,
+
=head3 gettimeofday
This is the traditional high resolution time of day interface for most
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