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C binding for leveldb, better readseq benchmark for SQLite.

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- Added a C binding for LevelDB.
  May be useful as a stable ABI that can be used by 
  programs that keep leveldb in a shared library, 
  or for JNI API.

- Replaced SQLite's readseq benchmark to a more efficient version. 
  SQLite readseq speeds increased by about a factor of 2x 
  from the previous version. Also updated benchmark page to
  reflect readseq speed up.



git-svn-id: https://leveldb.googlecode.com/svn/trunk@46 62dab493-f737-651d-591e-8d6aee1b9529
This commit is contained in:
gabor@google.com
2011-08-05 20:40:49 +00:00
parent 1bfbe76b4e
commit 021ee9c32b
7 changed files with 1036 additions and 15 deletions
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26
doc/bench/db_bench_sqlite3.cc
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@@ -23,7 +23,6 @@
// fillseq100K -- write N/1000 100K values in sequential order in async mode
// readseq -- read N times sequentially
// readrandom -- read N times in random order
// readseq100K -- read N/1000 100K values in sequential order in async mode
// readrand100K -- read N/1000 100K values in sequential order in async mode
static const char* FLAGS_benchmarks =
"fillseq,"
@@ -38,7 +37,7 @@ static const char* FLAGS_benchmarks =
"readseq,"
"fillrand100K,"
"fillseq100K,"
"readseq100K,"
"readseq,"
"readrand100K,"
;
@@ -387,7 +386,7 @@ class Benchmark {
Write(write_sync, SEQUENTIAL, FRESH, num_ / 1000, 100 * 1000, 1);
WalCheckpoint(db_);
} else if (name == Slice("readseq")) {
Read(SEQUENTIAL, 1);
ReadSequential();
} else if (name == Slice("readrandom")) {
Read(RANDOM, 1);
} else if (name == Slice("readrand100K")) {
@@ -395,11 +394,6 @@ class Benchmark {
reads_ /= 1000;
Read(RANDOM, 1);
reads_ = n;
} else if (name == Slice("readseq100K")) {
int n = reads_;
reads_ /= 1000;
Read(SEQUENTIAL, 1);
reads_ = n;
} else {
known = false;
if (name != Slice()) { // No error message for empty name
@@ -640,6 +634,22 @@ class Benchmark {
ErrorCheck(status);
}
void ReadSequential() {
int status;
sqlite3_stmt *pStmt;
std::string read_str = "SELECT * FROM test ORDER BY key";
status = sqlite3_prepare_v2(db_, read_str.c_str(), -1, &pStmt, NULL);
ErrorCheck(status);
for (int i = 0; i < reads_ && SQLITE_ROW == sqlite3_step(pStmt); i++) {
bytes_ += sqlite3_column_bytes(pStmt, 1) + sqlite3_column_bytes(pStmt, 2);
FinishedSingleOp();
}
status = sqlite3_finalize(pStmt);
ErrorCheck(status);
}
};
}