The Boston Diaries

The ongoing saga of a programmer who doesn't live in Boston, nor does he even like Boston, but yet named his weblog/journal “The Boston Diaries.”

Go figure.

Thursday, August 07, 2008

Still obsessing over stupid benchmarks …

The problem. The PHP implementation is a lot slower. Embarrassingly slower. Without any caching the Java version is able to do ~6000 queries per second. The PHP counterpart can push through ~850 queries. The implementations are the same. The stats provided by the author of the library are 8000 vs 1200. So about the same as my measurements.

Via reddit.com, Case study: Is PHP embarrasingly slower than Java?

In my ever continuing obsession with stupid benchmarks and optimization, I decided to tackle this particular little problem like I did with Jumble—map everything into memory and avoid disk I/O altogether (well, explicit disk I/O—the system will page in the data implicitly as it's used). This time, the data maps down to an object file about 8½ megabytes in size (all constant data, so pages can be discarded, not paged out), and with that, I was able to get ~100,000 queries per second.

On a 120MHz machine!

It didn't even take all that long to write …

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