HHVM consistently slower than PHP CLI

StackOverflow https://stackoverflow.com/questions/21504348

  •  05-10-2022
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Question

I'm using code from the computer language benchmarks game; namely nbody.php.

When running without HHVM the performance is as follows:

$ time php -n n.php 
real    0m5.247s
user    0m5.235s
sys 0m0.008s

When running with HHVM in server mode and reloading the pages 30+ times the speed is:

real    0m6.905s
user    0m0.001s
sys 0m0.000s

I'm running HHVM with: hhvm -m server -v Eval.JitWarmupRequests=3 n.php

Am I missing some 'special' configuration for HHVM? Or, is it just slower with nbody? My PHP tests are with 5.5.3 without any kind of an opcode cache.

Was it helpful?

Solution

We don't JIT pseudomains (code not in a function or class) because $globals is way too crazy to deal with.

Put all your code in a function main() then call it.

Also, make sure you warm up the server a bunch (maybe 100 requests) so the translation cache is primed.

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