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Small speedup of CompactionFilterV2

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Summary: ToString() is expensive. Profiling shows that most compaction threads are stuck in jemalloc, allocating a new string. This will help out a litte.

Test Plan: make check

Reviewers: haobo, danguo

Reviewed By: danguo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17583
This commit is contained in:
Igor Canadi 2014-04-08 11:06:39 -07:00
parent 92c1eb0291
commit beeee9dccc
1 changed files with 4 additions and 4 deletions
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8
db/db_impl.cc
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@ -2961,9 +2961,9 @@ Status DBImpl::DoCompactionWork(CompactionState* compact,
const SliceTransform* transformer =
cfd->options()->compaction_filter_factory_v2->GetPrefixExtractor();
std::string key_prefix = transformer->Transform(key).ToString();
const auto key_prefix = transformer->Transform(key);
if (!prefix_initialized) {
compact->cur_prefix_ = key_prefix;
compact->cur_prefix_ = key_prefix.ToString();
prefix_initialized = true;
}
if (!ParseInternalKey(key, &ikey)) {
@ -2973,7 +2973,7 @@ Status DBImpl::DoCompactionWork(CompactionState* compact,
continue;
} else {
// If the prefix remains the same, keep buffering
if (key_prefix == compact->cur_prefix_) {
if (key_prefix.compare(Slice(compact->cur_prefix_)) == 0) {
// Apply the compaction filter V2 to all the kv pairs sharing
// the same prefix
if (ikey.type == kTypeValue &&
@ -2994,7 +2994,7 @@ Status DBImpl::DoCompactionWork(CompactionState* compact,
if (compact->key_buf_.size() > 0) {
CallCompactionFilterV2(compact, compaction_filter_v2);
}
compact->cur_prefix_ = key_prefix;
compact->cur_prefix_ = key_prefix.ToString();
}
}