[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Libunwind-devel] Performance issue with tdep_get_elf_image()
From: |
Arun Sharma |
Subject: |
Re: [Libunwind-devel] Performance issue with tdep_get_elf_image() |
Date: |
Mon, 2 Jun 2008 23:39:34 -0700 |
On Sat, May 31, 2008 at 7:16 AM, David Mosberger-Tang
<address@hidden> wrote:
> Caching would improve performance greatly. The ia64 version of
> libunwind has this implemented, but not the DWARF-based version (yet).
There is such a cache in dwarf/Gparser.c:get_rs_cache().
But I've tested it only on x86. Perhaps it's not getting enabled on
ARM for some reason?
On x86_64:
$ tests/Lperf-simple
unw_getcontext : cold avg= 259.876 nsec, warm avg= 209.808 nsec
unw_init_local : cold avg= 309.944 nsec, warm avg= 169.277 nsec
no cache : unw_step : 1st=10104.406 min= 1750.674 avg= 1812.264 nsec
global cache : unw_step : 1st= 7665.725 min= 122.615 avg= 133.057 nsec
per-thread cache: unw_step : 1st= 6103.516 min= 122.615 avg= 133.020 nsec
-Arun
- Re: [Libunwind-devel] Performance issue with tdep_get_elf_image(),
Arun Sharma <=