Antonis Christofides wrote:
Hi,
At the almost idle Dual Core machine which runs slapd, I run:
nice sh -c 'while true; do true; done' & nice sh -c 'while true; do true; done' &
(i.e. I'm running this twice). Then each of the two CPUs always has some job to do, so both CPUs have 100% usage, but this is "nice".
Then, slapd takes too long to respond to queries. It may take 10 or 20 seconds. If I kill or stop one of the two dummy processes, it replies instantly. If I continue both dummy processes, it's back to 10 or 20 seconds. Needless to say all machine resources seem ok; low disk usage, lots of spare memory; and slapd is not niced.
If it's not something immediately obvious, could you help me debug it? I've run slapd with various "-d" options but it gives me results that I have trouble understanding.
The OS is Debian 3.1 (Sarge), with a 2.6.12 SMP Linux kernel.
You didn't mention what version of slapd you're running. On the current version (2.3.30) with my dual-core system your test only slowed slapd down by 5%.