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If ReadCompaction is switched off, then it is better to not even submit background compaction jobs.

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Summary:
If ReadCompaction is switched off, then it is better to not even
submit background compaction jobs. I see about 3% increase in
read-throughput on a pure memory database.

Test Plan: run db_bench

Reviewers: heyongqiang

Reviewed By: heyongqiang

Differential Revision: https://reviews.facebook.net/D5673
This commit is contained in:
Dhruba Borthakur
2012-09-25 09:15:32 -07:00
parent 26e0ecbd98
commit 24eea931ef
2 changed files with 3 additions and 2 deletions
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3
db/db_impl.cc
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@@ -1196,7 +1196,8 @@ Status DBImpl::Get(const ReadOptions& options,
mutex_.Lock();
}
if (have_stat_update && current->UpdateStats(stats)) {
if (!options_.disable_seek_compaction &&
have_stat_update && current->UpdateStats(stats)) {
MaybeScheduleCompaction();
}
mem->Unref();

2
db/version_set.cc
View File

@@ -1392,7 +1392,7 @@ Compaction* VersionSet::PickCompaction() {
// Wrap-around to the beginning of the key space
c->inputs_[0].push_back(current_->files_[level][0]);
}
} else if (seek_compaction && !options_->disable_seek_compaction) {
} else if (seek_compaction) {
level = current_->file_to_compact_level_;
c = new Compaction(level, MaxFileSizeForLevel(level),
MaxGrandParentOverlapBytes(level), NumberLevels());