Site performance, Server errors, outages and tunings

[Like Ra]

New forum record today:

"The most users online at one time was 120 on Today at 23:14"

Most likely they were bots, not real users, but the server survived the load. Nice 😉

[Like Ra]

- upgraded the kernel
- moved the apache cache to tmpfs
- added more cache tweaks

[Like Ra]

Fixed a couple of more issues. Still no luck with limiting the size of the cache file system - it periodically overflows. Tried another config, let's see if that helps.

[Like Ra]

As always - it's not that easy. Bugs, tweaks and workarounds. The cache does not want to be cleaned up, because of an old bug. The easiest solution (rather a dirty trick) is a cron job removing old files.

BTW, has anybody noticed anything? Any improvements?

[B1u3]

Hm, its not preloading so much, e.g. if I open a thread here in the forum and scroll down, its loading the posts while scrolling.
But in generell its really ok.

[Like Ra]

Yes, the idea was to load just what's needed (what's visible) as quick as possible. That allows to reduce the average page size and load time by about 30%. And not everybody scrolls down (or up).

[B1u3]

Ok, I'm fine with that 😊

[Like Ra]

Good! 😉

[Like Ra]

While APC cache reports pretty good statistics:

File Cache Information
Cached Files 402 ( 48.2 MBytes)
Hits 2978069
Misses 441529

User Cache Information
Cached Variables 585 ( 1.4 MBytes)
Hits 219488
Misses 149317

the pagespeed one is quite disappointing:

cache_hits: 5693
cache_misses: 22714

It's mostly related to the image rewriting, but I'm not sure it can be completely disabled.

[Like Ra]

I think I found it! I should've complained earlier 😉

It should work much faster now! 😊