[Trilinos-Users] Performance of InsertGlobalValue() in Epetra

andrea3.villa at mail.polimi.it andrea3.villa at mail.polimi.it
Fri Apr 18 07:16:53 MDT 2008


I have used this function:

int Epetra_FECrsMatrix::InsertGlobalValues  (  int  numRows,
   const int *  rows,
   int  numCols,
   const int *  cols,
   const double *const *  values,
   int  format = Epetra_FECrsMatrix::ROW_MAJOR
  )

Thank you!



Citando "Williams, Alan B" <william at sandia.gov>:

> Andrea,
>
> That is a large and unexpected performance difference.
>
> I looked through the FECrsMatrix code and there is no function   
> called exactly 'InsertGlobalValue'. Do you mean one of the   
> overloaded 'InsertGlobalValues' functions? There are several of   
> these, both in FECrsMatrix and its base class CrsMatrix. Can you   
> tell which of these it is?
>
> I'll set up a test of my own and attempt to reproduce this.
> Alan
>
>
>> -----Original Message-----
>> From: trilinos-users-bounces at software.sandia.gov
>> [mailto:trilinos-users-bounces at software.sandia.gov] On Behalf
>> Of andrea3.villa at mail.polimi.it
>> Sent: Thursday, April 17, 2008 8:17 AM
>> To: trilinos-users at software.sandia.gov
>> Subject: [Trilinos-Users] Performance of InsertGlobalValue() in Epetra
>>
>>   Hi,
>>
>> I've a problem assembling a FECrsMatrix, in particoular in the
>> InsertGlobalValue() function. While on my laptop an assemble process
>> of a 500.000 row square matrix takes about 50 seconds, on my
>> workstation
>> it takes about 2300 seconds. I've made a profile of the code
>> I've found
>> that the difference is inside the InsertGlobalValue() function.
>>
>> The laptop is:
>> 2.5Ghz Intel T9300 (4Mb cache), 4Gb ram, with OS: Suse 10.3
>>
>> The worstation is:
>> 2.0Ghz AMD Opteron 8212 (1Mb cache), 16Gb ram, with OS: Scientific
>> Linux 5.0
>>
>> On both I've installed Trilinos 8.0.5, with this flags:
>> CXXFLAGS="-DMPICH_SKIP_MPICXX -O3"
>> CFLAGS="-O3"
>> FFLAGS="-O5 -funroll-all-loops -ftree-vectorize"
>>
>> Have anyone experienced a similar problem?
>> Any idea to close the gap?
>>
>> Thanks for any help,
>>
>>     Andrea V.
>>
>>
>>
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>> Trilinos-Users at software.sandia.gov
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>>
>
>








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