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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