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benchtests: Rename argument to TIMING_INIT macro.

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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.
This commit is contained in:
Will Newton 2013-09-11 13:07:33 +01:00
parent c0e0f3b297
commit b987c77672
3 changed files with 17 additions and 10 deletions
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7
ChangeLog
View File

@ -1,3 +1,10 @@
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.
2013-09-10 Adhemerval Zanella <azanella@linux.vnet.ibm.com>
* sysdeps/powerpc/fpu/libm-test-ulps: Update.

6
benchtests/bench-skeleton.c
View File

@ -53,9 +53,11 @@ main (int argc, char **argv)
memset (&runtime, 0, sizeof (runtime));
unsigned long iters;
unsigned long iters, res;
TIMING_INIT (iters);
TIMING_INIT (res);
iters = 1000 * res;
for (int v = 0; v < NUM_VARIANTS; v++)
{

14
benchtests/bench-timing.h
View File

@ -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) \