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| author | Wilco Dijkstra <Wilco.Dijkstra@arm.com> | 2019-01-29 17:43:45 +0000 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2019-03-22 17:30:44 -0300 |
| commit | 7621e38bf3c58b2d0359545f1f2898017fd89d05 (patch) | |
| tree | fbf712328d2d62a509d7a048e2fb22a5bf0f4b55 /benchtests/README | |
| parent | 1e372ded4f83362509c8672ff501cba871bb1edc (diff) | |
| download | glibc-7621e38bf3c58b2d0359545f1f2898017fd89d05.tar glibc-7621e38bf3c58b2d0359545f1f2898017fd89d05.tar.gz glibc-7621e38bf3c58b2d0359545f1f2898017fd89d05.tar.bz2 glibc-7621e38bf3c58b2d0359545f1f2898017fd89d05.zip | |
Add generic hp-timing support
Add missing generic hp_timing support. It uses clock_gettime (CLOCK_MONOTONIC)
which has unspecified starting time, nano-second accuracy, and should faster on
architectures that implementes the symbol as vDSO.
Checked on aarch64-linux-gnu, x86_64-linux-gnu, and i686-linux-gnu. I also
checked the builds for all afected ABIs.
* benchtests/Makefile (USE_CLOCK_GETTIME) Remove.
* benchtests/README: Update description.
* benchtests/bench-timing.h: Default to hp-timing.
* sysdeps/generic/hp-timing.h (HP_TIMING_DIFF, HP_TIMING_ACCUM_NT,
HP_TIMING_PRINT): Remove.
(HP_TIMING_NOW): Add generic implementation.
(hp_timing_t): Change to uint64_t.
Diffstat (limited to 'benchtests/README')
| -rw-r--r-- | benchtests/README | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/benchtests/README b/benchtests/README index aaf0b659e2..c4f03fd872 100644 --- a/benchtests/README +++ b/benchtests/README @@ -27,12 +27,7 @@ BENCH_DURATION. The benchmark suite does function call measurements using architecture-specific high precision timing instructions whenever available. When such support is -not available, it uses clock_gettime (CLOCK_PROCESS_CPUTIME_ID). One can force -the benchmark to use clock_gettime by invoking make as follows: - - $ make USE_CLOCK_GETTIME=1 bench - -Again, one must run `make bench-clean' before changing the measurement method. +not available, it uses clock_gettime (CLOCK_MONOTONIC). On x86 processors, RDTSCP instruction provides more precise timing data than RDTSC instruction. All x86 processors since 2010 support RDTSCP |