----- "Michal Nowak" <mnowak(a)redhat.com> wrote:
----- "Ian Lance Taylor" <iant(a)google.com> wrote:
> Hi, Tom Tromey pointed me at your message
>
http://lists.fedoraproject.org/pipermail/devel/2010-March/133039.html
Hi Ian.
> I was curious what you are timing when you compare ld and gold. Is
> that the total time that it takes to build the package, or just the
> time that the linker runs?
You may be familiar with Mock which builds source RPMs in chroot. Mock
prepares build root (e.g. fedora-12-x86_64), installs BuildRequires,
and builds given SRPM. Such a build should be repeatable. What is
done
is that run of this `mock' process is timed -- bad thing obviously
here
is that the build time includes part which is not related to build
itself
(i.e. build root preparation, package installation), however good is
that
the unrelated time is pretty much constant among runs.
If anyone knows hot to measure just the build time, I'd be glad to
know.
> As you mention, xulrunner and thunderbird are much slower, which is
> rather odd and completely contrary to my own testing. Do you know
if
> those builds use linker scripts? Do you have the build logs?
Unfortunately logs are gone with my yesterday's reinstall. However I
am
building xulrunner and thunderbird right now on different box. Will
let
you know till Monday.
No idea about the linking script since logs are gone.
> Also, what sort of machine were you running this on, and how much
RAM
> did it have?
Dualcore, Intel(R) Xeon(R) CPU 5110 @ 1.60GHz, 2GB RAM, 4GB swap.
Ian -
> I'd certainly like to get to the bottom of any cases where
gold is
> significantly slower than GNU ld.
>
> I'm not on the devel(a)lists.fedoraproject.org mailing list.
Run with gold was run first, build root was cleared afterwards and
run with ld was run then. gold seems to be way slower.
GNU GOLD
========
[ PACKAGES xulrunner thunderbird REBUILD ]
ld: CVS snapshot from date: 20100312
gcc: gcc-4.4.3-4.fc12 (likely, just a guess)
kernel: Linux <BLANK> 2.6.32.9-70.fc12.x86_64 #1 SMP Wed Mar 3 04:40:41 UTC 2010
x86_64 x86_64 x86_64 GNU/Linux (from this machine)
[1/2]
Package: xulrunner-1.9.1.8-1.fc12
Time: 18:27.26
Size: 67M
Status: PASS
[2/2]
Package: thunderbird-3.0.3-1.fc12
Time: 15:55.48
Size: 89M
Status: PASS
==============================================
TOTAL: 2 PASS: 2 FAIL: 0
GNU ld
======
[ PACKAGES xulrunner thunderbird REBUILD ]
ld: binutils-2.19.51.0.14-37.fc12 (likely, just a guess)
gcc: gcc-4.4.3-4.fc12 (likely, just a guess)
kernel: Linux <BLANK> 2.6.32.9-70.fc12.x86_64 #1 SMP Wed Mar 3 04:40:41 UTC 2010
x86_64 x86_64 x86_64 GNU/Linux (from this machine)
[1/2]
Package: xulrunner-1.9.1.8-1.fc12
Time: 10:00.12
Size: 66M
Status: PASS
[2/2]
Package: thunderbird-3.0.3-1.fc12
Time: 9:37.08
Size: 87M
Status: PASS
==============================================
TOTAL: 2 PASS: 2 FAIL: 0
Here are the logs:
http://people.redhat.com/psklenar/pub/
Michal