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| author | Mathias Stearn <mathias@10gen.com> | 2015-10-01 17:32:25 -0400 |
|---|---|---|
| committer | Mathias Stearn <mathias@10gen.com> | 2015-10-08 12:06:52 -0400 |
| commit | 804ad14001e1a58538974a327e9943c338fd0925 (patch) | |
| tree | ba34ab7034b61ab256e520af64441a854e23d270 /src/mongo/db/stats | |
| parent | d6f74cfcbcaddff79b09de1fc8b07d30236d7972 (diff) | |
| download | mongo-804ad14001e1a58538974a327e9943c338fd0925.tar.gz | |
SERVER-20668 Support prehashing StringMap keys
This allows computing the hash outside of a mutex guarding the StringMap.
This commit applies this optimization in Top::record().
Diffstat (limited to 'src/mongo/db/stats')
| -rw-r--r-- | src/mongo/db/stats/top.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/mongo/db/stats/top.cpp b/src/mongo/db/stats/top.cpp index f4f66d42a05..5b06b7b3c0d 100644 --- a/src/mongo/db/stats/top.cpp +++ b/src/mongo/db/stats/top.cpp @@ -77,6 +77,8 @@ void Top::record(StringData ns, int op, int lockType, long long micros, bool com if (ns[0] == '?') return; + auto hashedNs = UsageMap::HashedKey(ns); + // cout << "record: " << ns << "\t" << op << "\t" << command << endl; stdx::lock_guard<SimpleMutex> lk(_lock); @@ -85,7 +87,7 @@ void Top::record(StringData ns, int op, int lockType, long long micros, bool com return; } - CollectionData& coll = _usage[ns]; + CollectionData& coll = _usage[hashedNs]; _record(coll, op, lockType, micros, command); } |