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sanitize readahead when direct read enabled 

Summary:
no readahead:
readseq      :       8.438 micros/op 118510 ops/sec;   13.1 MB/s
sanitize to 10MB:
readseq      :       6.051 micros/op 165248 ops/sec;   18.3 MB/s
Closes https://github.com/facebook/rocksdb/pull/1945

Differential Revision: D4645811

Pulled By: lightmark

fbshipit-source-id: 5d63770
This commit is contained in:
Aaron Gao 2017-03-02 17:11:18 -08:00 committed by Facebook Github Bot
parent f89b3893c0
commit 6fb9013441
1 changed files with 4 additions and 0 deletions
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4
db/db_impl.cc
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@ -197,6 +197,10 @@ DBOptions SanitizeOptions(const std::string& dbname, const DBOptions& src) {
result.db_paths.emplace_back(dbname, std::numeric_limits<uint64_t>::max());
}
if (result.use_direct_reads && result.compaction_readahead_size == 0) {
result.compaction_readahead_size = 1024 * 1024 * 2;
}
if (result.compaction_readahead_size > 0) {
result.new_table_reader_for_compaction_inputs = true;
}