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

Justin Zhang jzz at mit.edu
Tue May 15 14:38:21 EDT 2012


I got similar problems. There are some segfaults issues with OpenMP on this. 


在 2012-5-15,下午1:17, Amittai Aviram 写道:

> 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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