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| author | Will Newton <will.newton@linaro.org> | 2013-09-11 13:07:33 +0100 |
|---|---|---|
| committer | Will Newton <will.newton@linaro.org> | 2013-09-11 15:18:20 +0100 |
| commit | b987c776723eea2f223885289c466386f12e823a (patch) | |
| tree | c03a7eed4aabf2c8397cda6366509a589ece16a6 /benchtests/bench-timing.h | |
| parent | c0e0f3b2979ed2046547cbc800256dabc03d1944 (diff) | |
| download | glibc-b987c776723eea2f223885289c466386f12e823a.tar glibc-b987c776723eea2f223885289c466386f12e823a.tar.gz glibc-b987c776723eea2f223885289c466386f12e823a.tar.bz2 glibc-b987c776723eea2f223885289c466386f12e823a.zip | |
benchtests: Rename argument to TIMING_INIT macro.
The TIMING_INIT macro currently sets the number of loop iterations
to 1000, which limits usefulness. Make the argument a clock
resolution value and multiply by 1000 in bench-skeleton.c instead
to allow easier reuse.
ChangeLog:
2013-09-11 Will Newton <will.newton@linaro.org>
* benchtests/bench-timing.h (TIMING_INIT): Rename ITERS
parameter to RES. Remove hardcoded 1000 value.
* benchtests/bench-skeleton.c (main): Pass RES parameter
to TIMING_INIT and multiply result by 1000.
Diffstat (limited to 'benchtests/bench-timing.h')
| -rw-r--r-- | benchtests/bench-timing.h | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/benchtests/bench-timing.h b/benchtests/bench-timing.h index 009813bb80..48a85210a0 100644 --- a/benchtests/bench-timing.h +++ b/benchtests/bench-timing.h @@ -25,10 +25,10 @@ hp_timing_t _dl_hp_timing_overhead; typedef hp_timing_t timing_t; -# define TIMING_INIT(iters) \ +# define TIMING_INIT(res) \ ({ \ HP_TIMING_DIFF_INIT(); \ - (iters) = 1000; \ + (res) = 1; \ }) # define TIMING_NOW(var) HP_TIMING_NOW (var) @@ -43,15 +43,13 @@ typedef hp_timing_t timing_t; #else typedef uint64_t timing_t; -/* Measure 1000 times the resolution of the clock. So for a 1ns - resolution clock, we measure 1000 iterations of the function call at a - time. Measurements close to the minimum clock resolution won't make - much sense, but it's better than having nothing at all. */ -# define TIMING_INIT(iters) \ +/* Measure the resolution of the clock so we can scale the number of + benchmark iterations by this value. */ +# define TIMING_INIT(res) \ ({ \ struct timespec start; \ clock_getres (CLOCK_PROCESS_CPUTIME_ID, &start); \ - (iters) = 1000 * start.tv_nsec; \ + (res) = start.tv_nsec; \ }) # define TIMING_NOW(var) \ |