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db_bench: in uncompress benchmark, get Snappy size from compressed stream 

Summary: Now in benchmark "uncompress" in db_bench, we get size from compressed stream for all other compression types except Snappy, where we allocate memory based on parameter. Change it to match to behavior of other compression types.

Test Plan: Run ./db_bench --benchmarks=uncompress with snappy and other compression types.

Reviewers: yhchiang, kradhakrishnan, anthony, IslamAbdelRahman, igor

Reviewed By: igor

Subscribers: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D51681
This commit is contained in:
sdong 2015-12-07 17:12:43 -08:00
parent 9c227923c6
commit ac8e56f050
1 changed files with 13 additions and 6 deletions
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19
db/db_bench.cc
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@ -2267,12 +2267,19 @@ class Benchmark {
while (ok && bytes < 1024 * 1048576) {
char *uncompressed = nullptr;
switch (FLAGS_compression_type_e) {
case rocksdb::kSnappyCompression:
// allocate here to make comparison fair
uncompressed = new char[input.size()];
ok = Snappy_Uncompress(compressed.data(), compressed.size(),
uncompressed);
break;
case rocksdb::kSnappyCompression: {
// get size and allocate here to make comparison fair
size_t ulength = 0;
if (!Snappy_GetUncompressedLength(compressed.data(),
compressed.size(), &ulength)) {
ok = false;
break;
}
uncompressed = new char[ulength];
ok = Snappy_Uncompress(compressed.data(), compressed.size(),
uncompressed);
break;
}
case rocksdb::kZlibCompression:
uncompressed = Zlib_Uncompress(compressed.data(), compressed.size(),
&decompress_size, 2);