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Make semi-ordered-set rehashing configurable to aid in latency tuning

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John Sully 2022-10-24 15:27:10 +00:00 committed by Malavan Sotheeswaran
parent d4555a6e38
commit 687850a612
2 changed files with 8 additions and 2 deletions
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2
src/config.cpp
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@ -40,6 +40,7 @@
#endif
const char *KEYDB_SET_VERSION = KEYDB_REAL_VERSION;
size_t g_semiOrderedSetTargetBucketSize = 0; // Its a header only class so nowhere else for this to go
/*-----------------------------------------------------------------------------
* Config file name-value maps.
@ -2910,6 +2911,7 @@ standardConfig configs[] = {
createBoolConfig("allow-write-during-load", NULL, MODIFIABLE_CONFIG, g_pserver->fWriteDuringActiveLoad, 0, NULL, NULL),
createBoolConfig("force-backlog-disk-reserve", NULL, MODIFIABLE_CONFIG, cserver.force_backlog_disk, 0, NULL, NULL),
createBoolConfig("soft-shutdown", NULL, MODIFIABLE_CONFIG, g_pserver->config_soft_shutdown, 0, NULL, NULL),
createSizeTConfig("semi-ordered-set-bucket-size", NULL, MODIFIABLE_CONFIG, 0, 1024, g_semiOrderedSetTargetBucketSize, 0, INTEGER_CONFIG, NULL, NULL),
#ifdef USE_OPENSSL
createIntConfig("tls-port", NULL, MODIFIABLE_CONFIG, 0, 65535, g_pserver->tls_port, 0, INTEGER_CONFIG, NULL, updateTLSPort), /* TCP port. */

8
src/semiorderedset.h
View File

@ -27,6 +27,7 @@ namespace keydbutils
template<>
size_t hash(const sdsview &);
}
extern size_t g_semiOrderedSetTargetBucketSize;
template<typename T, typename T_KEY = T, bool MEMMOVE_SAFE = false>
class semiorderedset
@ -41,11 +42,14 @@ class semiorderedset
size_t idxRehash = (1ULL << bits_min);
int cfPauseRehash = 0;
constexpr size_t targetElementsPerBucket()
inline size_t targetElementsPerBucket()
{
// Aim for roughly 4 cache lines per bucket (determined by imperical testing)
// lower values are faster but use more memory
return std::max((64/sizeof(T))*8, (size_t)2);
if (g_semiOrderedSetTargetBucketSize == 0)
return std::max((64/sizeof(T))*8, (size_t)2);
else
return g_semiOrderedSetTargetBucketSize;
}
public: