[Pysparse-developers] Fwd: ll_mat memory leak

[Roman G. <rom...@gm...>]

Hi

I got this bug report (with proposed fix) from a pysparse user. It sounds like it concerns some of the newer code (which I'm unfamiliar with). Could you please take a look at it?

Thanks,
Roman

Begin forwarded message:

> From: Andreea Georgiana Gane <and...@gm...>
> Date: July 26, 2010 9:17:36 PM GMT+02:00
> To: ro...@ge...
> Subject: ll_mat memory leak
> 
> Hi,
> 
> I have recently downloaded the latest version of pysparse (pysparse-1.1.1) and I want to report a memory leak in the ll_mat implementation.
> 
> For the following code:
>         for i in range(nt):
>             # get max value and index on each row
>             row = relTT[i,:]
> the program crashed with MemoryError at about 13000th iteration (relTT was a ll_mat matrix of size 63751 x 63751).
> 
> It seems the problem was in the getSubMatrix_FromList implementation, since when "we have a mixture of index sets", some indexes were created (irow, jcol) and the memory they occupied was never deallocated (lines 850-887 in the ll_mat.c file). Freeing the allocated index/indexes before each return of the function solved my problem.
> 
> Best regards,
> Andreea