project-base/server-skynet-source-3rd-jemalloc
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Increase PRN 'a' and 'c' constants.

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Increase PRN 'a' and 'c' constants, so that high bits tend to cascade
more.
This commit is contained in:
Jason Evans 2010-10-03 00:10:15 -07:00
parent 9ce3bfd92d
commit c6e950665c
2 changed files with 2 additions and 2 deletions
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2
jemalloc/include/jemalloc/internal/ckh.h
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@ -45,7 +45,7 @@ struct ckh_s {
#endif #endif
/* Used for pseudo-random number generation. */ /* Used for pseudo-random number generation. */
#define CKH_A 12345 #define CKH_A 1103515241
#define CKH_C 12347 #define CKH_C 12347
uint32_t prn_state; uint32_t prn_state;

2
jemalloc/src/prof.c
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@ -644,7 +644,7 @@ prof_sample_threshold_update(void)
*/ */
PROF_SAMPLE_STATE_GET(prof_sample_state); PROF_SAMPLE_STATE_GET(prof_sample_state);
prn64(r, 53, prof_sample_state->prn_state, prn64(r, 53, prof_sample_state->prn_state,
(uint64_t)1125899906842625LLU, 1058392653243283975); (uint64_t)6364136223846793005LLU, (uint64_t)1442695040888963407LLU);
u = (double)r * (1.0/9007199254740992.0L); u = (double)r * (1.0/9007199254740992.0L);
prof_sample_state->threshold = (uint64_t)(log(u) / prof_sample_state->threshold = (uint64_t)(log(u) /
log(1.0 - (1.0 / (double)((uint64_t)1U << opt_lg_prof_sample)))) log(1.0 - (1.0 / (double)((uint64_t)1U << opt_lg_prof_sample))))