Object caching in HHVM

Are you positively sure that HHVM by itself offers any object caching that MediaWiki can use?

Alexander Mashin^talk

No I am not. During testing under HHVM I just enabled object caching to see if it worked and it did, and when enabled there is a measurable performance boost compared to a wiki setup without object caching and HHVM so something is happening. It is very hard to find any documentation about this, hence the black box :)

Felipe (talk)

And by what directive exactly did you enable object caching? In HHVM config, I mean.

Alexander Mashin^talk

I did not change anything to the default setup of the HHVM INI file.

Felipe (talk)

Thank you. Well, that's why I suspect there is no object caching in HHVM as such. There might be some in APC under HHVM though.

Alexander Mashin^talk

Are you suggesting that APC is somehow running "next" to HHVM? I am pretty sure that I did not install APC on any of the test systems. I was under the impression that as of PHP 5.5 APC is "dead".

Felipe (talk)

Yes, under new versions of PHP, APC has to be replaced with APCU, but, under HHVM, APC is one of the extensions that are enabled by default.

Alexander Mashin^talk

OK, this means that a wiki running on HHVM with object caching enabled the object caching is done by APC?

Felipe (talk)

It could be so.

Alexander Mashin^talk