[Bug malloc/16159] malloc_printerr() deadlock, when calling malloc_printerr() again

["neleai at seznam dot cz" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=16159

--- Comment #19 from Ondrej Bilka <neleai at seznam dot cz> ---
On Thu, Nov 14, 2013 at 03:54:30PM +0000, bugdal at aerifal dot cx wrote:
> https://sourceware.org/bugzilla/show_bug.cgi?id=16159
> 
> --- Comment #18 from Rich Felker <bugdal at aerifal dot cx> ---
> Ondrej, did you even check your results with readelf or ldd? -lgcc is a static
> library and is always linked, so of course it won't make any difference. You
> need to test with -lgcc_s (and double-check to make sure the dependency really
> got added).
> 
I asked for benchmark because of that, with a lgcc_s there is difference.

plain

real    0m3.039s
user    0m0.195s
sys    0m3.049s

with lgcc_s

real    0m3.141s
user    0m0.169s
sys    0m3.179s

with lpthread

real    0m3.282s
user    0m0.182s
sys    0m3.308s

> BTW, I'm not sure how well your test will do measuring exec time versus other
> overhead. If you'd like, I have a test I can post that execs itself and
> measures the actual time from just before the execve syscall to the start of
> main.
> 
These also count as I wanted to show a relative performance impact. If
this is taken into extreme we could improve performance by staticaly linking lm
and lpthread

Or using prelink.

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