PHPBuilder - Open Source Databases: As the Tables Turn Page 3



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Open Source Databases: As the Tables Turn - Page 3

by: Tim Perdue
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November 12, 2000

Pleasantly Surprised

With 30 clients pounding the test machine, Postgres chugged along at 3.76 pages per second. That sounded really bad at first, until we ran the same test on MySQL. MySQL did so poorly that we eventually cancelled the test and reduced the concurrency to just 5 users, and it still only fared .77 pages per second.
To be clear, this is an unusually intense page and requires 16 queries and joins a dozen tables together in interesting ways. If you're wise, you won't make your entire web application this complex.
To spice up this test, we created a second PHP page that did inserts, updates, deletes, and used transactions. We had 30 clients hit this new page, and 30 clients hit the "My Personal Page" simultaneously. Since Postgres supports transactions, we decided to have 25% of the transactions "rollback" to see if that causes any performance problems.
To be fair, this is a test where we fully expected MySQL would fail - because of its table-level locking. The "My Personal Page" joins several times against our "Groups" table, which was being updated frequently in this test. While it was being updated, of course MySQL would have to wait to get a table-level lock, while PostgreSQL would simply move along using its "better than row level" locking.
Postgres chugged along at 2.05 pages/second, and MySQL simply failed the test and locked itself up (again table-level locking is the major pitfall of using MySQL). MySQL didn't crash, but our benchmarking software (Apache's "ab" utility) timed out when it didn't get any result from MySQL.
The numbers here are telling. MySQL was very slow even at 5 concurrent users, and failed at 15 concurrent users (the graph actually flatters MySQL's performance here).
Read/Update Concurrency Test graph

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