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On some systems the CPU's time stamp counter (TSC) cannot reliabily be

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used.  Mercury's ThreadScope support will now use gettimeofday() by
default, but use of the TSC may be enabled.

Note that in Linux, gettimeofday() does not always make a system call.

runtime/mercury_threadscope.[ch]:
    Add support for measuring time with gettimeofday().

    Use gettimeofday() to measure time by default.

runtime/mercury_atomic_ops.[ch]
    Add a new function MR_tsc_is_sensible(), It returns true if the TSC can
    (as far as the RTS can detect) be used.

    Fix trailing whitespace.

runtime/mercury_wrapper.c:
    Add a new runtime option --threadscope-use-tsc.
    When specified this option allows threadscope to use the CPU's TSC to
    measure time.

doc/userguide.texi:
    Document the --threadscope-use-tsc option.  This documentation is
    commented out.
This commit is contained in:
Paul Bone
2012-06-20 13:13:34 +00:00
parent 7380ec7f59
commit a9f82d004b
6 changed files with 121 additions and 41 deletions
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8
runtime/mercury_threadscope.h
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@@ -49,6 +49,14 @@ typedef struct MR_Threadscope_String {
MR_TS_StringId MR_tsstring_id;
} MR_Threadscope_String;
/*
** Set this to true to use the CPU's time stamp counter.
**
** This is initially set in mercury_wrapper.c and may be reset by
** MR_setup_threadscope if the TSC can't be used.
*/
extern MR_bool MR_threadscope_use_tsc;
/*
** This must be called by the primordial thread before starting any other
** threads but after the primordial thread has been pinned.