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Re: nVidia Optumus prevents using CUDA?
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