Thanks for your helpful response. From what you say, opcode caching is
essential and Xcache is the way to go.
But just to understand - does a php-fpm pool access a single Xcache, or
is there a separate cache set up for each process? I'm trying to get a
handle on the memory implications.
Thanks for the heads up on uWSGI. But my sysadmin skills are basic (I'm
a developer really) and it looks a bit scary. There's not much info out
there, while fastcgi is supported in the php core. For someone who is
not a proper sysadmin, is uWSGI, in its present state of development,
really a sensible way to go?