On 07/30/2011 12:19 PM, Dan Kennedy wrote:
> On 07/30/2011 04:45 AM, Gabor Cselle wrote:
>> Just a heads-up that we just posted an update to the benchmarks:
>> - No more superfluous index on the primary key
>> - WAL turned on with auto-checkpointing every 4096 pages
>>
>> http://leveldb.googlecode.com/svn/trunk/doc/benchmark.html
>>
>> A diff of the results is here:
>> http://code.google.com/p/leveldb/source/diff?spec=svn45&r=45&format=side&path=/trunk/doc/benchmark.html&old_path=/trunk/doc/benchmark.html&old=44
>>
>> A new version of db_bench_sqlite3.cc is also included in the same revision.
>>
>> As predicted by people here, SQLite shows significant performance
>> improvements across the board except for large values (which I attribute to
>> WAL).
>>
>> We're planning to put together a benchmark that uses 64-bit integers as
>> keys, rather than 128-bit/16-byte blobs (My understanding is that SQLite
>> stores 64-bit, not 32-bit integers). I'll post the results to this mailing
>> list.
>
> That's correct. 64-bit integers.
>
>> Thanks everyone for your suggestions.
>
> Another one you could do, if you're making changes, is add a
> ReadSequential() function to db_bench_sqlite3.cc. Leveldb and KC are
> both using an iterator to read the keys sequentially, but SQLite is
> doing a separate lookup of each key.
>
> How about something like this:
>
> void ReadSequential() {
> int status;
> sqlite3_stmt *pStmt;
> int i;
> std::string read_str = "SELECT * FROM test";
Oops. Should be: "SELECT * FROM test ORDER BY key".
>
> status = sqlite3_prepare_v2(db_, read_str.c_str(), -1,&pStmt, NULL);
> ErrorCheck(status);
> for (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);
> }
>
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>
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