xCache – PHP caching, performance and stability

I’ve been testing out xCache for a while – primarily as a PHP accelerator.

Early results were really promising – reducing page load times dramatically; and also reducing CPU load as common pages (i.e. the latest blog post and photos) were fed directly from the cache.

There seems to be some kind of memory leak/cache clean up issue with xCache 1.3 – I allocate some amount of RAM for cache (16MB, 64MB, 256MB – it really doesn’t matter) and at some point Apache/PHP starts eating up RAM, then starting to swap – and finally the server grinds to a halt.

xCache is off for now – I’ll keep investigating.

Overnight line problems

Any ideas?

Twice this week all connectivity has been lost – upstream of the CPE (on premise router).

The first was from 2100 to 0800:


The next from 2130 to 0430:


It looks like some kind of maintenance window from the Qwest who actually provision the line.