2749
Comment:

← Revision 5 as of 20081114 13:41:56 ⇥
2751
converted to 1.6 markup

Deletions are marked like this.  Additions are marked like this. 
Line 1:  Line 1: 
Investigate memory leaks associated to [http://sage.math.washington.edu/sage/hg/sagemain/file/3643a7cae944/sage/modular/ssmod/ssmod.py SupersingularModule ] code  Investigate memory leaks associated to [[http://sage.math.washington.edu/sage/hg/sagemain/file/3643a7cae944/sage/modular/ssmod/ssmod.pySupersingularModule ]] code 
Investigate memory leaks associated to SupersingularModule code
 Forwarded message  Date: Wed, 14 Feb 2007 20:51:12 0800 From: William Stein <[email protected]> ReplyTo: [email protected] To: [email protected] Subject: [sagedevel] Re: Memory leaks You should try to create a coding sprint project out of this for SAGE Days 3: http://sage.math.washington.edu:9001/days3/sprints The memory leak might just be the result of caching in the ssmod.py module... You would do well to think through precisely what X = SupersingularModule(p) X.hecke_matrix(2) does. The get_memory_usage() command can be very useful also for seeing when memory is going up but not down. On Wed, 14 Feb 2007 19:42:22 0800, Iftikhar Burhanuddin <[email protected]> wrote: > > Hi folks, > > The following piece of code seems to leak a lot of memory (with/without > the statement 'del X') during long runs of computation: > > while true: > X = SupersingularModule(p) > X.hecke_matrix(2) > del X > p = ZZ(p).next_prime() > > To pin down the souce of leakage, I incorporated the below code > > http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65333 > > into mine > > http://sage.math.washington.edu/home/burhanud/leak/leak.py > > > [1] When I run > > load leak.py > > at the sage prompt, I get the following output ad infinitum: > > http://sage.math.washington.edu/home/burhanud/leak/dump.txt > > Are _PolynomialRing_general, _FiniteField_ext_pariElement leaking memory? > > [2] When I run > > nohup sage <leak.py> tmp.txt & > > from the shell prompt, sage exits in a few milliseconds due to an > Indentation Error exception. > > http://sage.math.washington.edu/home/burhanud/leak/tmp.txt > > Why does the leak.py run perfectly from the sage prompt but not from the > shell? Preparsing issue? > > Regards, > Ifti  Forwarded message  Date: Fri, 16 Feb 2007 06:02:11 +0000 From: Joshua Kantor <[email protected]> ReplyTo: [email protected] To: sagedevel <[email protected]> Subject: [sagedevel] Re: Memory leaks Perhaps related (and maybe already fixed). But I noticed the following do M=MatrixSpace(ZZ,1000) then repeatedly do m=M.random_element();get_memory_usage() You should see the memory usage go up by around 16 mb per execution and it doesn't appear to ever go down, If you do the same thing with RDF matrices for example, the memory usage goes up a bit but remains basically constant.