[erlang-bugs] Erlang 18.0-rc1 is behaving slower than 17.4 (and 17.5)

[Jesper Louis Andersen]

On Wed, Apr 8, 2015 at 3:34 PM, José Valim <jose.valim@REDACTED>
wrote:

> In the reports you can see the total time for running the test suite, as
> well as the time taken only for loading, and then just running the tests.


It can be either the way the tests are constructed and run, the compiler
producing worse code, or a slowdown in the runtime. I'd suggest
investigating by measuring the behaviour of the system while it is
executing the tests. Many things have changed, so it can be anything which
causes such a slowdown. Also, confirmation from the OTP team that the build
has no assertions in it would be nice. E.g., FreeBSD enables a lot of extra
checking on their -CURRENT to catch problems early on. But as a
benchmarking target, it is fairly bad :)

To heed Brendan Gregg, use active benchmarking, the USE method[0]

http://www.brendangregg.com/activebenchmarking.html


-- 
J.
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