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| author | Michael Cahill <michael.cahill@wiredtiger.com> | 2014-05-29 11:22:27 +1000 |
|---|---|---|
| committer | Michael Cahill <michael.cahill@wiredtiger.com> | 2014-05-29 11:22:27 +1000 |
| commit | b3f62b4381c358ab79fd2f76315b85b920f0e701 (patch) | |
| tree | 8eaf749617806252e6020112a202de1c3a2e0e6c /bench | |
| parent | 0698139a520463498d4f5c7e6b8c6e30bfd91e13 (diff) | |
| download | mongo-b3f62b4381c358ab79fd2f76315b85b920f0e701.tar.gz | |
Fix the pareto calculation in wtperf: __wt_random returns values up to UINT32_MAX, not RAND_MAX.
found when testing for #1032
Diffstat (limited to 'bench')
| -rw-r--r-- | bench/wtperf/wtperf.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/bench/wtperf/wtperf.c b/bench/wtperf/wtperf.c index 2b5059c2010..36e603cf4b0 100644 --- a/bench/wtperf/wtperf.c +++ b/bench/wtperf/wtperf.c @@ -2178,12 +2178,12 @@ wtperf_rand(CONFIG *cfg) #define PARETO_SHAPE 1.5 S1 = (-1 / PARETO_SHAPE); S2 = wtperf_value_range(cfg) * 0.2 * (PARETO_SHAPE - 1); - U = 1 - (double)rval / (double)RAND_MAX; + U = 1 - (double)rval / (double)UINT32_MAX; rval = (pow(U, S1) - 1) * S2; /* * This Pareto calculation chooses out of range values about * about 2% of the time, from my testing. That will lead to the - * last item in the table being "hot". + * first item in the table being "hot". */ if (rval > wtperf_value_range(cfg)) rval = wtperf_value_range(cfg); |