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Diffstat (limited to 'benchtests/README')
| -rw-r--r-- | benchtests/README | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/benchtests/README b/benchtests/README index c4f03fd872..f440f3295a 100644 --- a/benchtests/README +++ b/benchtests/README @@ -27,7 +27,12 @@ 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_MONOTONIC). +not available, it uses clock_gettime (CLOCK_MONOTONIC). 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. On x86 processors, RDTSCP instruction provides more precise timing data than RDTSC instruction. All x86 processors since 2010 support RDTSCP |