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Add --compression_type=X option with valid values: snappy (default) none bzip2 zlib

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Summary:
This adds an option to db_bench to specify the compression algorithm to
use for LevelDB

Test Plan: ran db_bench

Reviewers: dhruba

Reviewed By: dhruba

Differential Revision: https://reviews.facebook.net/D5421
This commit is contained in:
Mark Callaghan 2012-09-14 11:21:54 -07:00
parent 93f4952089
commit 837113908c
1 changed files with 69 additions and 7 deletions
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76
db/db_bench.cc
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@ -161,6 +161,10 @@ static int FLAGS_level0_slowdown_writes_trigger = 8;
// setting is 9 gets for every 1 put.
static int FLAGS_readwritepercent = 90;
// Algorithm to use to compress the database
static enum leveldb::CompressionType FLAGS_compression_type =
leveldb::kSnappyCompression;
// posix or hdfs environment
static leveldb::Env* FLAGS_env = leveldb::Env::Default();
@ -394,6 +398,22 @@ class Benchmark {
fprintf(stdout, "FileSize: %.1f MB (estimated)\n",
(((kKeySize + FLAGS_value_size * FLAGS_compression_ratio) * num_)
/ 1048576.0));
switch (FLAGS_compression_type) {
case leveldb::kNoCompression:
fprintf(stdout, "Compression: none\n");
break;
case leveldb::kSnappyCompression:
fprintf(stdout, "Compression: snappy\n");
break;
case leveldb::kZlibCompression:
fprintf(stdout, "Compression: zlib\n");
break;
case leveldb::kBZip2Compression:
fprintf(stdout, "Compression: bzip2\n");
break;
}
PrintWarnings();
fprintf(stdout, "------------------------------------------------\n");
}
@ -409,13 +429,39 @@ class Benchmark {
"WARNING: Assertions are enabled; benchmarks unnecessarily slow\n");
#endif
// See if snappy is working by attempting to compress a compressible string
const char text[] = "yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy";
std::string compressed;
if (!port::Snappy_Compress(text, sizeof(text), &compressed)) {
fprintf(stdout, "WARNING: Snappy compression is not enabled\n");
} else if (compressed.size() >= sizeof(text)) {
fprintf(stdout, "WARNING: Snappy compression is not effective\n");
if (FLAGS_compression_type != leveldb::kNoCompression) {
// The test string should not be too small.
const int len = FLAGS_block_size;
char* text = (char*) malloc(len+1);
bool result = true;
const char* name = NULL;
std::string compressed;
memset(text, (int) 'y', len);
text[len] = '\0';
switch (FLAGS_compression_type) {
case kSnappyCompression:
result = port::Snappy_Compress(text, strlen(text), &compressed);
name = "Snappy";
break;
case kZlibCompression:
result = port::Zlib_Compress(text, strlen(text), &compressed);
name = "Zlib";
break;
case kBZip2Compression:
result = port::BZip2_Compress(text, strlen(text), &compressed);
name = "BZip2";
break;
}
if (!result) {
fprintf(stdout, "WARNING: %s compression is not enabled\n", name);
} else if (name && compressed.size() >= strlen(text)) {
fprintf(stdout, "WARNING: %s compression is not effective\n", name);
}
free(text);
}
}
@ -802,6 +848,7 @@ class Benchmark {
options.level0_stop_writes_trigger = FLAGS_level0_stop_writes_trigger;
options.level0_slowdown_writes_trigger =
FLAGS_level0_slowdown_writes_trigger;
options.compression = FLAGS_compression_type;
Status s = DB::Open(options, FLAGS_db, &db_);
if (!s.ok()) {
fprintf(stderr, "open error: %s\n", s.ToString().c_str());
@ -1082,6 +1129,8 @@ class Benchmark {
int main(int argc, char** argv) {
FLAGS_write_buffer_size = leveldb::Options().write_buffer_size;
FLAGS_open_files = leveldb::Options().max_open_files;
// Compression test code above refers to FLAGS_block_size
FLAGS_block_size = leveldb::Options().block_size;
std::string default_db_path;
for (int i = 1; i < argc; i++) {
@ -1180,6 +1229,19 @@ int main(int argc, char** argv) {
} else if (sscanf(argv[i],"--level0_slowdown_writes_trigger=%d%c",
&n, &junk) == 1) {
FLAGS_level0_slowdown_writes_trigger = n;
} else if (strncmp(argv[i], "--compression_type=", 19) == 0) {
const char* ctype = argv[i] + 19;
if (!strcasecmp(ctype, "none"))
FLAGS_compression_type = leveldb::kNoCompression;
else if (!strcasecmp(ctype, "snappy"))
FLAGS_compression_type = leveldb::kSnappyCompression;
else if (!strcasecmp(ctype, "zlib"))
FLAGS_compression_type = leveldb::kZlibCompression;
else if (!strcasecmp(ctype, "bzip2"))
FLAGS_compression_type = leveldb::kBZip2Compression;
else {
fprintf(stdout, "Cannot parse %s\n", argv[i]);
}
} else {
fprintf(stderr, "Invalid flag '%s'\n", argv[i]);
exit(1);