[erlang-questions] Erlang is the best choice for building commercial application servers

Richard O'Keefe <>
Thu Mar 15 01:09:29 CET 2012


Jan Burse's naive reverse for Erlang is not quite what we usually mean
by nrev; he measures the time to create the initial data list as well,
which the Java version doesn't.

Revising the Erlang code slightly, I got 2.8 usec per call.
I also revised the Java code slightly, for example, NOT to
use accessor methods, and NOT to require any casting during
the benchmark.  Also, both benchmarks were revised by
doing

	t0 = now
	run a dummy benchmark calling an identity function
	t1 = now
	run the real benchmark
	t2 = now
	report ((t2 - t1) - (t1 - t0))/(double)number-of-iterations

as is traditional in the naive reverse benchmark.

The final score:

Erlang:  2.8 usec per call
Java  :  3.2 usec per call (reported as 3226.977 nsec)

Machine: a MacBook pro with a 2GHz Intel core 2 Duo cpu running
Mac OS X 10.6.8.

Multiplying these numbers by 6000 to match Jan Burse's:
	Me	    Him	     Him, scaled
Erlang  16.8 m      ~60 ms   ~ 72.9 ms
Java    19.2 ms     ~30 ms   ~ 36.5 ms
(The scaled column assumes that the 2430 number is CPU
speed; if that's not what it is, ignore that column.)

There's one tiny change that accounts for this.

And it's the reason this benchmark really tells us nothing worth knowing.




More information about the erlang-questions mailing list