From ac51a26bdc69dc35e1f4f89b62c3134047e93bc1 Mon Sep 17 00:00:00 2001 From: Luke Dashjr Date: Sat, 11 Nov 2017 09:05:36 +0000 Subject: During IBD, when doing pruning, prune 10% extra to avoid pruning again soon after Pruning forces a chainstate flush, which can defeat the dbcache and harm performance significantly. --- src/validation.cpp | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'src/validation.cpp') diff --git a/src/validation.cpp b/src/validation.cpp index 4ce0723b21..7f447d4fcc 100644 --- a/src/validation.cpp +++ b/src/validation.cpp @@ -3391,6 +3391,15 @@ void FindFilesToPrune(std::set& setFilesToPrune, uint64_t nPruneAfterHeight int count=0; 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++) { nBytesToPrune = vinfoBlockFile[fileNumber].nSize + vinfoBlockFile[fileNumber].nUndoSize; -- cgit v1.2.3