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Re: nVidia Optumus prevents using CUDA?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg122665] Re: nVidia Optumus prevents using CUDA?
  • From: Oliver Ruebenkoenig <ruebenko at wolfram.com>
  • Date: Sat, 5 Nov 2011 04:46:32 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <201111030844.DAA15180@smc.vnet.net>

On Thu, 3 Nov 2011, DmitryG wrote:

> On Nov 2, 4:29 am, "Oleksandr Rasputinov"
> <oleksandr_rasputi... at hmamail.com> wrote:
>> On Tue, 01 Nov 2011 05:03:29 -0000, DmitryG <einsch... at gmail.com> wrote:
>>> Hi All,
>>
>>> Being interested in GPU computations, I have bought a new powerful
>>> laptop Lenovo Y570 ($1080) that has, according to my test today, a
>>> 1.05 Mathematica 8.0.4 benchmark, under Windows 7 64 bit.
>>
>>> The main reason to buy this laptop was that it has nVidia Geforce 555M
>>> graphic card that is one of the best in the consumer range and has 96
>>> CUDA cores.
>>
>>> I have got the new Mathematica 8.0.4 activated today and the first
>>> thing was to try out CUDA. To my disappointment, it appears that
>>> Mathematica does not see the nVidia GPU at all, and all that it sees
>>> is the integrated Intel HD graphics. Thus CUDAInformation[] command
>>> outputs "CUDAInformation::invdevnm: "CUDA is not supported on device \!
>>> \(\"Intel(R) HD Graphics Family\"\)."
>>
>>> I know that there is nVidia Optimus manager that tries to redistribute
>>> the load between the integrated HD graphics and the nVidia GPU. Also
>>> there is a hardware switch in my laptop to activate or deactivate the
>>> GPU. Thus I have GPU activated per this switch and also in the "Manage
>>> 3D settings -> Global settings" of the nVidia control panel I have
>>> checked nVidia as the preferred graphic processor (other options are
>>> Automatic and integrated HD graphics). However, this did not bring
>>> anything to the way Mathematica works with CUDA.
>>
>>> I do not know if the above is related to another disappointment. I
>>> have installed Microsoft Visual C++ 2010 express, as on my previous
>>> Win 7 64 bit laptop (that has a too old nVidia card, though) and it
>>> turned out that it does not work with Mathematica. Even the command
>>> CCompilers[Full] does not say that Microsoft Visual can be installed
>>> on my system, there are only Intel Compiler and a generic C compiler
>>> in the list. I don't know why there is such a difference with my
>>> previous laptop. I have checked Windows SDK and it is installed. What
>>> else?
>>
>>> It seems that there is some relation between CUDa and C compiler,
>>> maybe a C compiler is a prerequisite for CUDA?
>>
>>> It appears I have serious problems with Mathematica on my new laptop,
>>> and any advice will be appreciated.
>>
>>> Dmitry
>>
>> I won't comment on the CUDA issue as it's not something that I'm familiar
>> with. However, I have had Visual C++ 2010 working with Mathematica (8.0.1;
>> I haven't got 8.0.4 yet) without difficulty. The installation is slightly
>> convoluted; here are my notes on the matter:
>>
>> Minimal installation of Microsoft Visual C++ 10.0 (2010) SP1
>>
>> Note that this installation does not include the Visual Studio IDE, help,
>> tools, etc. Only the build system, compilers, headers, and libraries will
>> be installed.
>>
>> 1. Get the Microsoft Windows SDK 7.1 for Windows 7 and .NET Framework 4:
>>
>>    http://www.microsoft.com/download/en/details.aspx?id=8442
>>
>> 2. From the SDK, install at least the headers and libraries, but do not
>> install the compilers. The headers and libraries will be installed for the
>> x86, x64, and IA64 platforms. To keep the installation self-contained, and
>> for for consistency with Visual Studio, one may install to
>> %ProgramFiles(x86)%\Microsoft Visual Studio 10.0\SDK rather than the
>> default location.
>>
>> 3. Get the Microsoft Visual C++ 2010 Service Pack 1 Compiler Update for
>> the Windows SDK 7.1:
>>
>>    http://www.microsoft.com/download/en/details.aspx?id=4422
>>
>> 4. Install the Compiler Update. This will install x86, x64, and IA64
>> compilers.
>>
>> 5. If support for the IA64 platform is not required, one can remove the
>> IA64 compiler via Add/Remove Programs (if present there) and then simply
>> delete all of the directories installed by either the SDK or the Compiler
>> Update that contain IA64-specific files. (Note that the Compiler Update
>> will install the x86-hosted IA64 cross-compiler along with the x86
>> compiler even if the IA64 compiler itself is not installed.) The
>> directories to delete can easily be identified since they all have "IA64"
>> as part of the name. This saves about 200MB of space. Note that apart from
>> the main installation directory, some (small) files are also installed
>> into %ProgramFiles(x86)%\MSBuild, including some for IA64 in
>> MSBuild\Microsoft.Cpp\v4.0\Platforms\IA64.
>>
>> 5. After installing, it is recommended to run Microsoft Update in case any
>> patches are required.
>>
>> As you see, this does not involve Visual Studio Express, which I
>> deliberately avoided since it does not include the 64-bit compilers
>> necessary for operation with Mathematica. Personally, I use MinGW-w64 GCC
>> 4.6.1 rather than Visual C++; this works perfectly well also but does
>> require modifications to Mathematica which I will not discuss here other
>> than to say that it would be nice if this compiler could be supported
>> without need of modifications in a future release.
>
> It is unfortunately Mathematica 8.0.4 that does not accept any
> compilers except of the Intel C Compiler, according to
> CCompilers[Full]. Checked on Windows 7 and Mac Snow Leopard.
>
> Dmitry
>
>

-- 

Dmitry, we have not dropped support for any of the compilers - there seems 
to be a configuration issue on your machine, why don't you contact 
support at wolfram.com - They will be able to assist you in sorting this out.

Oliver



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