[parsec-users] freqmine: segmentation fault on simlarge input

Amittai Aviram amittai.aviram at yale.edu
Tue May 15 13:17:59 EDT 2012

I forgot to mention in the posting below that I am encountering this problem with freqmine with the OpenMP configuration.

Amittai Aviram

On May 15, 2012, at 3:55 AM, Amittai Aviram wrote:

> Hi!  I am getting a segmentation fault when running freqmine with any number of threads (I have tried 1, 2, 4, and 8), using the "simlarge" input (kosarek_990k.dat).  The problem occurs consistently in FP_tree::FP_growth_first, in file fp_tree.cpp, line 1312:
> /* Lines 1311-1312: */
>        for (int k = 0; k < hot_node_num; k ++)
>                hashtable[0][k] = NULL;
> The segmentation fault seems to occur when k == 1, and it seems to occur in the master thread (or at least occurs in that thread first on my system).  I have tried to do more investigations and experiments, but, so far, I have not found a solution.
> Oddly, freqmine runs fine with the even larger "native" input.
> I am running PARSEC on Ubuntu-linux x86_64 (server), kernel 2.6.32, on a 12-core AMD machine.  I left the compilation defaults intact in parsegmgmt, so it's using g++, which is version 4.4.3.
> Has anybody else encountered this problem?  Thanks!
> Amittai Aviram
> PhD Student in Computer Science
> Yale University
> 646 483 2639
> amittai.aviram at yale.edu
> http://www.amittai.com

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