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Improved benchmark, fixed bugs and SQLite parameters.

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- Based on suggestions on the sqlite-users mailing list,
  we removed the superfluous index on the primary key 
  for SQLite's benchmarks, and turned write-ahead logging 
  ("WAL") on. This led to performance improvements for SQLite.

- Based on a suggestion by Florian Weimer on the leveldb
  mailing list, we disabled hard drive write-caching via
  hdparm when testing synchronous writes. This led to
  performance losses for LevelDB and Kyoto TreeDB.

- Fixed a mistake in 2.A.->Random where the bar sizes
  were switched for Kyoto TreeDB and SQLite.



git-svn-id: https://leveldb.googlecode.com/svn/trunk@45 62dab493-f737-651d-591e-8d6aee1b9529
This commit is contained in:
gabor@google.com
2011-07-29 21:35:05 +00:00
parent b9ef9141ba
commit 1bfbe76b4e
2 changed files with 69 additions and 67 deletions
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10
doc/bench/db_bench_sqlite3.cc
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@@ -74,7 +74,7 @@ static bool FLAGS_use_existing_db = false;
static bool FLAGS_transaction = true;
// If true, we enable Write-Ahead Logging
static bool FLAGS_WAL_enabled = false;
static bool FLAGS_WAL_enabled = true;
inline
static void ExecErrorCheck(int status, char *err_msg) {
@@ -448,16 +448,20 @@ class Benchmark {
// Change journal mode to WAL if WAL enabled flag is on
if (FLAGS_WAL_enabled) {
std::string WAL_stmt = "PRAGMA journal_mode = WAL";
// LevelDB's default cache size is a combined 4 MB
std::string WAL_checkpoint = "PRAGMA wal_autocheckpoint = 4096";
status = sqlite3_exec(db_, WAL_stmt.c_str(), NULL, NULL, &err_msg);
ExecErrorCheck(status, err_msg);
status = sqlite3_exec(db_, WAL_checkpoint.c_str(), NULL, NULL, &err_msg);
ExecErrorCheck(status, err_msg);
}
// Change locking mode to exclusive and create tables/index for database
std::string locking_stmt = "PRAGMA locking_mode = EXCLUSIVE";
std::string create_stmt =
"CREATE TABLE test (key blob, value blob, PRIMARY KEY(key))";
std::string index_stmt = "CREATE INDEX keyindex ON test (key)";
std::string stmt_array[] = { locking_stmt, create_stmt, index_stmt };
std::string stmt_array[] = { locking_stmt, create_stmt };
int stmt_array_length = sizeof(stmt_array) / sizeof(std::string);
for (int i = 0; i < stmt_array_length; i++) {
status = sqlite3_exec(db_, stmt_array[i].c_str(), NULL, NULL, &err_msg);