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fix(rowstorage): SplitMix64 PRNG implementation to replace stdlib MT PRNG that uses /dev/urandom guarded by spinlock

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This commit is contained in:
Roman Nozdrin
2023-11-01 18:19:34 +00:00
parent 7aa6e4c107
commit dfc9e89496
2 changed files with 18 additions and 8 deletions
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7
utils/rowgroup/rowstorage.cpp
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@ -1495,9 +1495,6 @@ RowAggStorage::RowAggStorage(const std::string& tmpDir, RowGroup* rowGroupOut, R
, fTmpDir(tmpDir)
, fRowGroupOut(rowGroupOut)
, fKeysRowGroup(keysRowGroup)
, fRD()
, fRandGen(fRD())
, fRandDistr(0, 100)
{
char suffix[PATH_MAX];
snprintf(suffix, sizeof(suffix), "/p%u-t%p/", getpid(), this);
@ -1683,7 +1680,7 @@ void RowAggStorage::dump()
break;
}
int64_t totalMem = fMM->getConfigured();
const int64_t totalMem = fMM->getConfigured();
// If the generations are allowed and there are less than half of
// rowgroups in memory, then we start a new generation
if (fAllowGenerations && fStorage->fLRU->size() < fStorage->fRGDatas.size() / 2 &&
@ -1691,7 +1688,7 @@ void RowAggStorage::dump()
{
startNewGeneration();
}
else if (fAllowGenerations && freeMem < totalMem / 10 * 3 && fRandDistr(fRandGen) < 30)
else if (fAllowGenerations && freeMem < totalMem / 10 * 3 && nextRandDistib() < 30)
{
startNewGeneration();
}