[erlang-questions] performance drop in R15A?

Nico Kruber <>
Wed Nov 30 11:36:17 CET 2011


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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