libeatmydata is a small LD_PRELOAD library designed to (transparently) disable fsync (and friends, like open(O_SYNC)). This has two side-effects: making software that writes data safely to disk a lot quicker and making this software no longer crash safe. DO NOT use libeatmydata on software where you care about what it stores. It’s called libEAT-MY-DATA for …
Use Apache 2.4 (so if you use Centos / RHEL, use v7). This has lower memory requirements, stable Event MPM (see below) and far more functionality. If you terminate SSL at Apache, use a clustered cache to keep track of SSL sessions. Otherwise the SSL session establishment will have to be renegotiated every time you …
perf.fail – do, learn, fail forward.. Great blog about web & system performance gotchas.
Manage Your Performance with Cgroups and Projects – O’Reilly Broadcast.