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Merge #11658: During IBD, when doing pruning, prune 10% extra to avoid pruning again soon after

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ac51a26bdc During IBD, when doing pruning, prune 10% extra to avoid pruning again soon after (Luke Dashjr)

Pull request description:

  Pruning forces a chainstate flush, which can defeat the dbcache and harm performance significantly.

  Alternative to #11359

Tree-SHA512: 631e4e8f94f5699e98a2eff07204aa2b3b2325b2d92e8236b8c8d6a6730737a346e0ad86024e705f5a665b25e873ab0970ce7396740328a437c060f99e9ba4d9
This commit is contained in:
Pieter Wuille 2018-07-13 20:12:16 -07:00
commit 9a1ad2c5cb
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1 changed files with 9 additions and 0 deletions
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9
src/validation.cpp
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@ -3729,6 +3729,15 @@ static void FindFilesToPrune(std::set<int>& setFilesToPrune, uint64_t nPruneAfte
int count=0; int count=0;
if (nCurrentUsage + nBuffer >= nPruneTarget) { if (nCurrentUsage + nBuffer >= nPruneTarget) {
// On a prune event, the chainstate DB is flushed.
// To avoid excessive prune events negating the benefit of high dbcache
// values, we should not prune too rapidly.
// So when pruning in IBD, increase the buffer a bit to avoid a re-prune too soon.
if (IsInitialBlockDownload()) {
// Since this is only relevant during IBD, we use a fixed 10%
nBuffer += nPruneTarget / 10;
}
for (int fileNumber = 0; fileNumber < nLastBlockFile; fileNumber++) { for (int fileNumber = 0; fileNumber < nLastBlockFile; fileNumber++) {
nBytesToPrune = vinfoBlockFile[fileNumber].nSize + vinfoBlockFile[fileNumber].nUndoSize; nBytesToPrune = vinfoBlockFile[fileNumber].nSize + vinfoBlockFile[fileNumber].nUndoSize;