[erlang-questions] performance drop in R15A?

Nico Kruber <>
Wed Nov 30 17:05:29 CET 2011


thank you
We'll try again tomorrow

Nico

On Wednesday 30 November 2011 16:30:05 Lukas Larsson wrote:
> Hello!
> 
> I was able to verify you findings on my machine for R14B04 and R15A. The
> problem is however fixed (I even get a 15% throughput improvement on your
> bench) in our latest internal master which will be pushed to github later
> this evening. So if you could pull the latest from github tomorrow and
> verify my findings that would be great!
> 
> Lukas
> 
> On Wed, Nov 30, 2011 at 11:36 AM, Nico Kruber <> wrote:
> > Is it possible, that some debug option is on by default in the R15A
> > tagged git
> > checkout?
> > We build the source using the following commands (on a x86_64 system
> > with 8 cores):
> > 
> > ./otp_build autoconf
> > ./configure --prefix=/home/buildbot/apps/erlang-R15A
> > make
> > make install
> > 
> > and then compiled our application (http://code.google.com/p/scalaris/)
> > using
> > R15A.
> > 
> > With our internal benchmarks ("make bench") showed a drop of around 15%
> > in performance compared to R14B04. We were actually hoping for an
> > increased performance reading about the memory allocation
> > improvements...
> > 
> > Is there some switch (during configuration or build) influencing the
> > performance?
> > 
> > output of R14B04 erl:
> > ------------------------------------------------------------
> > Erlang R14B04 (erts-5.8.5) [source] [64-bit] [smp:8:8] [rq:8] [async-
> > threads:0] [hipe] [kernel-poll:false]
> > 
> > Eshell V5.8.5  (abort with ^G)
> > 1>
> > ------------------------------------------------------------
> > 
> > output of R15A erl:
> > ------------------------------------------------------------
> > Erlang R15A (erts-5.9.pre) [source] [64-bit] [smp:8:8] [rq:8] [async-
> > threads:0] [hipe] [kernel-poll:false]
> > 
> > Eshell V5.9.pre  (abort with ^G)
> > 1>
> > ------------------------------------------------------------
> > 
> > 
> > Regards
> > Nico Kruber
> > _______________________________________________
> > erlang-questions mailing list
> > 
> > http://erlang.org/mailman/listinfo/erlang-questions
-- 
Nico Kruber
phone: +49 30 84185-253
-----
Zuse Institute Berlin
Takustr. 7
D-14195 Berlin
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