[erlang-questions] performance drop in R15A?

Lukas Larsson <>
Wed Nov 30 16:30:05 CET 2011


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
> _______________________________________________
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> 
> http://erlang.org/mailman/listinfo/erlang-questions
>
>
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