Re: [Jython-users] Memory allocation

[Jim B. <jb...@zy...>]

Try using xrange instead.

The range function is returning a list of 1,000,000 elements, and you're
allocating 20 of these. That's enough to start exhausting the heap by
exceeding the max heap size, which defaults to 512M. Unlike CPython, you
must specify that for JVM languages, perhaps it's a feature, regardless it's
what we have to work with. But obviously you don't have anything here that
needs for changing that setting (but to be complete, you would set it with
something like -J-Xmx1024m)

On Wed, Aug 19, 2009 at 3:53 PM, una_muna <ma...@gm...> wrote:

>
> Hello!
> I just started to use Jython, so I ask your pardon if I ask something
> obviuos.
> As an example I have written a simple application using threads:
> ############################################
> #!/usr/bin/jython
>
> import threading
> import os, glob
>
> number_of_threads_in_pool = 20
> threadPool =[]
>
> class Compute ( threading.Thread ):
>
>      def run ( self ):
>        sum = 0
>        for i in range (1000000):
>            sum += i
>
> for i in range(number_of_threads_in_pool):
>         new_thread = Compute()
>         new_thread.setDaemon(True)
>         threadPool.append(new_thread)
>         new_thread.start( )
>         print "Thread no." + new_thread.getName() + " is started";
> for existing_thread in threadPool:
>        existing_thread.join( )
> print "Main finished";
> ############################################
> When running it I receive the following error:
> ############################################
> Traceback (most recent call last):
>  File
>
> "/home/marias/StarTeamCP/bin/c:/Work/websec/Main/Projects/ct-jython-test/threading.py",
> line 460, in _Thread__bootstrap
>    self.run()
>  File "threadpoolsimple.py", line 24, in run
>    sum += i
> OutOfMemoryError: java.lang.OutOfMemoryError: Java heap space
> ############################################
> When running with the CPython interpreter everything works fine.
> What I'm doing wrong? Why does this error occure? Does python use java's
> Integer object to store the numbers? Is there any memory leak?
>
> I use jython 2.5.0, OS - fedora 8.
>
> Thank you.
> Maria.
> --
> View this message in context:
> http://www.nabble.com/Memory-allocation-tp25052594p25052594.html
> Sent from the jython-users mailing list archive at Nabble.com.
>
>
>
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-- 
Jim Baker
jb...@zy...