Subject: Re: SymCache performance
To: <>
From: David Laight <david@l8s.co.uk>
List: tech-toolchain
Date: 09/06/2002 14:37:55
On Fri, Sep 06, 2002 at 01:13:39PM +0000, Charles Hannum wrote:
>
> So I test the SymCache code a little, and made two observations:
>
> * Although it does reduce many lookups that my `combreloc' code does
> not currently, it did not actually make a measurable change in
> mozilla's startup time. Perhaps it will win more with some other
> applications.
The bottleneck must be somewhere else. Maybe either profiling
or timestamping the LD_DEBUG output would be informative.
> * It actually makes David Laight's stupid-program
The best test programs always are :-)
> test run slower for me. With it disabled, I get:
>
> mururoa# time /var/tmp/qd 999
> 1.15 real 0.42 user 0.71 sys
>
> and with it enabled, I get:
>
> mururoa# time /var/tmp/qd 999
> 1.34 real 0.44 user 0.88 sys
Have you got my fix (see kern/18085) for process time counting
installed?
Without it the values reported by 'time' are not reliable.
David
--
David Laight: david@l8s.co.uk