Re: [Getfem-users] GMM++ and Visual Studio 2008

[Andriy Andreykiv - 3ME]

Dear Danesh,

Regarding the performance with Visual Studio. I was wondering if you're linking GMM++ with some windows built BLAS library, do you? If not then I think GMM++ is using its own replacement for BLAS which is very slow.  At least it was the case when I was doing this on Linux.

Best regards,
                        Andriy


-----Original Message-----
From: address@hidden on behalf of Cédric Venet
Sent: Sun 10/10/2010 12:09 PM
To: Danesh Daroui
Cc: address@hidden
Subject: Re: [Getfem-users] GMM++ and Visual Studio 2008

  Le 09/10/2010 22:34, Danesh Daroui a écrit :
>
> Thanks for your tip. Well, the correct term is _SECURE_SCL and it can
> be passed to compiler to turn it off by adding /D "_SECURE_SCL=0".
> But, I have read somewhere that it can make your code

sorry for the typo, I didn't check it first.

> unstable and get many runtime crashes. However, I have not tested yet.
> Microsoft have also announced that

Like I said, its an abi incompatible change (in the STL). So all the
library that you like and use the STL must be compiled with this flag.
If you do it, there is no problem. If you forget => strange runtime
crash. I use this flag for all my project for 3+years and never had any
problem. If you see strange bug in the stl, you know where it cames from.


> this flag is off by default in release mode in Visual Studio's later
> version. So the problem is fixed in
> Visual Studio 2010.

yes, like I said "well known gotcha which has been fixed in VS2010"

>
> Thanks again for your help,
>
> D.
>
>
> On 2010-10-09 16:34, Cédric Venet wrote:
>>> WOW! I really hope that this will fix the problem. I will check it
>>> tomorrow, but can you please let me know what does this flag do?
>>
>> check on the internet, its a well known gotcha which has been fixed
>> in VS2010. basically, it disable some iterator checking which is
>> strangely active even in release mode.
>>
>>
>>>
>>> Another question! Do I have to add the line
>>>
>>> #define _SCL_SECURE 0
>>>
>>> to all my header and code sources even source of GMM++ or just on my
>>> own source files or even on file is enough?
>>
>> easiest way is to add  /D"_SCL_SECURE=0" (or the like) to your
>> command line when compiling your code *and* gmm (if its not header only?)
>> or add it first in all the C++ files.
>>
>>
>>> What about those pragmas you mentioned?
>>
>> check msdn. if needed add, they must be defined before including the
>> gmn headers.
>>
>>
>>>
>>>
>>> Thanks
>>>
>>>
>>>
>>> On 2010-10-08 10:09, Cédric Venet wrote:
>>>> hi,
>>>>
>>>> try to define _SCL_SECURE=0 (warning ABI incompatible so all the
>>>> code you link must use this flag)
>>>> for code using the stl heavily, it can result in 100x speedup.
>>>>
>>>> perhaps also:
>>>>
>>>> #pragma inline_recursion
>>>> #pragma inline_depth
>>>>
>>>> and check all the optimisation are on.
>>>>
>>>> regards
>>>> Cédric
>>>>
>>>>
>>>> On 07/10/2010 23:23, Danesh Daroui wrote:
>>>> >
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>>>> > Hi,
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>>>> > I have recently ported our code written with GMM++ to
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>>>> > and recompiled the code in Visual Studio 2008. The
>>>> weird
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>>>> Visual
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>>>> > 2008 has extremely poor performance comparing to the
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>>>> code
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>>>> Intel
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>>>> > What is the reason? I thought, maybe the GMM++ code is
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>>>> that
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>>>> > experience?
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>>>> > Thanks,
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>>>> > D.
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>>>> > _______________________________________________
>>>>
>>>>
>>>>
>>>> Getfem-users
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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>>>>
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>>>>
>>>>
>>>> mailing
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>>>> > list address@hidden
>>>>
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>>>> https://mail.gna.org/listinfo/getfem-users
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>>>
>>>
>>> --
>>> Danesh Daroui
>>> Ph.D Student
>>> Lulea University of Technology
>>> http://www.ltu.se
>>>
>>> address@hidden
>>> Tel: +46-(0)920-492451
>>> Cell phone: +46-(0)704-399847
>>
>
>
> --
> Danesh Daroui
> Ph.D Student
> Lulea University of Technology
> http://www.ltu.se
>
> address@hidden
> Tel: +46-(0)920-492451
> Cell phone: +46-(0)704-399847