Sorry... should have read your blog post...
The first problem is your hardware... the hard drive in the MacBook Pro
is a dog.
The second problem is your OS... the Mach Kernel is notoriously bad for
doing IO... Linus has an occasional rant about this. My MacBook Pro has
something like 1/2 the disk read performance of my ThinkPad T41 running
Ubuntu (same disk rotation speed and the TPad has an IDE drive, not SATA.)
My guess is that you're spending nearly a whole CPU doing disk IO... you
might try a larger file and see how much of your time is spent in System
vs. User.
David Pollak wrote:
> How many cores in your machine?
>
> Martin Probst wrote:
>> Hi,
>>
>> I tried to implement Tim Bray's Wide Finder proposal
>> (
http://www.tbray.org/ongoing/When/200x/2007/09/20/Wide-Finder) in
>> Scala,
>> using Actors. The code is here:
>>
http://www.martin-probst.com/2007/09/24/wide-finder-in-scala/>>
>> Basically, it's about parsing a log file using regular expressions.
>> In my
>> code, I have one coordinator who reads the log file and sends work
>> chunks
>> to several analyzers, and the combines their work again.
>>
>> As I write there, I don't see any speedup when running the code using
>> Actors in comparison with the serial version. Any ideas? Am I doing
>> something wrong?
>>
>> Is there any way to specify the number of threads that should be used
>> for
>> Actor execution?
>>
>> Regards,
>> Martin
>>
>>
>
