5.x SLOW - How do I speed it up?
Arjan van Leeuwen
avleeuwen at piwebs.com
Wed Jan 28 08:57:44 PST 2004
On Wednesday 28 January 2004 03:18, slave-mike wrote:
> What are all the options one needs to change before doing a
> to make sure all the debugging features are off?
- remove the kernel debugging options, as it says
- turn off malloc debugging, e.g.
ln -s aj /etc/malloc.conf
> > NOTE TO PEOPLE WHO THINK THAT FreeBSD 5.x IS SLOW:
> > FreeBSD 5.x has many debugging features turned on, in
> > both the kernel and userland. These features attempt to detect
> > incorrect use of system primitives, and encourage loud failure
> > through extra sanity checking and fail stop semantics. They
> > also substantially impact system performance. If you want to
> > do performance measurement, benchmarking, and optimization,
> > you'll want to turn them off. This includes various WITNESS-
> > related kernel options, INVARIANTS, malloc debugging flags
> > in userland, and various verbose features in the kernel. Many
> > developers choose to disable these features on build machines
> > to maximize performance.
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