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During benchmarking, I see excessive use of vector.reserve(). 

Summary:
This code path can potentially accumulate multiple important_files for level 0.
But for other levels, it should have only one file in the
important_files, so it is ok not to reserve excessive space, is it not?

Test Plan: make check

Reviewers: haobo

Reviewed By: haobo

CC: reconnect.grayhat, leveldb

Differential Revision: https://reviews.facebook.net/D14349
This commit is contained in:
Dhruba Borthakur 2013-11-25 22:04:29 -08:00
parent e60dde71c7
commit 8478f380a0
1 changed files with 3 additions and 1 deletions
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4
db/version_set.cc
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@ -458,7 +458,9 @@ void Version::Get(const ReadOptions& options,
// Get the list of files to search in this level
FileMetaData* const* files = &files_[level][0];
important_files.clear();
important_files.reserve(num_files);
if (level == 0) {
important_files.reserve(num_files);
}
// Some files may overlap each other. We find
// all files that overlap user_key and process them in order from