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Re: [patch] Speed up find_pc_section

On Fri, Jul 17, 2009 at 10:19 AM, Paul Pluzhnikov<ppluzhnikov@google.com> wrote:

>  NNN  before     after
>
>  256  0m1.042s 0m0.337s
>  512  0m6.837s 0m0.887s
> 1024 0m31.406s 0m4.594s

Looks like I managed to confuse myself even more (too many variants of
gen.pl :-(

Above results are for a simplified test case (gen-20090720.pl, attached).

Here are the timings I get using unpatched vs. patched GDB using the
original gen.pl from
http://sourceware.org/ml/gdb-patches/2009-07/msg00417/gen.pl

 NNN     before       after

 256   0m03.544s     0m02.724s
 512   0m15.693s     0m10.025s
1024   1m06.844s     0m39.742s

So not such a drastic improvement for *this* test case.

Most of the time for this test is actually spent in dwarf2_frame_find_fde,
for which I'll send another patch shortly.

Thanks,
-- 
Paul Pluzhnikov

Attachment: gen-20090720.pl
Description: Perl program

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