Dan Nelson schrieb:
In the last episode (Jan 23), Rahul Siddharthan said:
Kenneth Culver wrote:
Did you by any chance build your own kernel? If so did you leave
things like this in:
options INVARIANTS #Enable calls of extra sanity
options INVARIANT_SUPPORT #Extra sanity checks of internal
options WITNESS #Enable checks to detect deadlocks
options WITNESS_SKIPSPIN #Don't run witness on spinlocks
I'd like to add that even with these removed, I was experiencing
terrible performance in building ports, etc (anything involving heavy
filesystem activity or memory usage). Setting up an /etc/malloc.conf
fixed this (this is also briefly noted in UPDATING). Specifically I
use (don't know whether it's optimal, but it works):
# ls -l /etc/malloc.conf
lrwxr-xr-x 1 root wheel 4 Jan 23 11:52 /etc/malloc.conf -> HR<
H and < should only make a difference if you are low on memory. R is on
by default in 5.0 anyway, due to A and J being on by default. Setting
malloc.conf to "aj" makes it work like it does in 4.*.
Ahh, thanks for the info. Just a notice. With malloc.conf pointing to "aj"
I got a speedup of over 85% for a specific test program for Perl 5.8.0:
To reproduce:
cd /usr/ports/lang/perl
make
cd work/perl-5.8.0
time ./perl t/op/pat.t
Results:
no /etc/malloc.conf 125 seconds user time
/etc/malloc.conf -> aj 18 seconds user time
on an AMD K6-2 300. I'd say this is a significant difference...
Daniel
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