Comments on: Running rings around Scala

By: Igor Minar

Igor Minar — Mon, 21 Sep 2009 20:09:48 +0000

My guess is that the perf difference between jdk5 vs jdk6 is due to jdk 5′s default -d32 -client mode vs -d64 -server in apple’s jdk6.

By: Thomas

Thomas — Mon, 24 Aug 2009 13:15:31 +0000

Hi,

I am a language nerd, and a learn new languages as a hobby – strange isn’t it. I experimented with Erlang, and I like it a lot, but I think it would be tough sell in my conservative company, I think it could be a lot easier with Scala, as it can be sold as a better Java.

I was looking whether I could get the same multicore boost in Scala as in Erlang. Your numbers are quite promissing – in your example message passing is about 2 times slower, but is it fair to say, that in a real world application, you would probably do more actual work in your actors, and the message passing overhead on Erlang would show up less ?

But on the otherside, isn’t the idea in Erlang, to use actors for really any smallest task ?

See I am still learning

Thomas

By: Manuel Barkhau

Manuel Barkhau — Wed, 08 Jul 2009 15:39:53 +0000

Scala version 2.7.3final (OpenJDK 64-Bit Server VM, Java 1.6.0_0)
100M messages : 200308
1000M messages : 2119845

No noticeable improvement through jit.
I should say it probably wouldn’t show, since cpu’s weren’t maxed out, indicating that memory bandwidth may be the bottleneck, with which jit wouldn’t help anyway.

By: Rich Dougherty

Rich Dougherty — Sat, 24 Jan 2009 21:29:53 +0000

I didn’t see it documented anywhere, but you can look inside the ‘scala’ script to see how it works. The following command seems to do the trick: JAVA_OPTS="-Xmx256M -Xms32M -server" scala.

By: Alex

Alex — Fri, 09 Jan 2009 17:36:49 +0000

Actually, I did not as I could figure out how to do that. scala -server gives me a usage error message. I actually searched for quite a while to figure out how to switch the hotspot version and never did find it on Google or searching the Scala site or the book. What am I missing?