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MemTable::PostProcess() can skip updating num_deletes if the delta is 0

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Summary: In many use cases there is no deletes. No need to pay the overhead of atomically updating num_deletes.

Test Plan: Run existing test.

Reviewers: ngbronson, yiwu, andrewkr, igor

Reviewed By: andrewkr

Subscribers: leveldb, andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D60555
This commit is contained in:
sdong 2016-07-08 12:51:24 -07:00
parent 2a282e5f54
commit e70ba4e40e
1 changed files with 4 additions and 2 deletions
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6
db/memtable.h
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@ -232,8 +232,10 @@ class MemTable {
num_entries_.fetch_add(update_counters.num_entries,
std::memory_order_relaxed);
data_size_.fetch_add(update_counters.data_size, std::memory_order_relaxed);
num_deletes_.fetch_add(update_counters.num_deletes,
std::memory_order_relaxed);
if (update_counters.num_deletes != 0) {
num_deletes_.fetch_add(update_counters.num_deletes,
std::memory_order_relaxed);
}
UpdateFlushState();
}