Re: nVidia Optumus prevents using CUDA?
- To: mathgroup at smc.vnet.net
- Subject: [mg122604] Re: nVidia Optumus prevents using CUDA?
- From: DmitryG <einschlag at gmail.com>
- Date: Thu, 3 Nov 2011 03:44:56 -0500 (EST)
- Delivered-to: email@example.com
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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
- Re: nVidia Optumus prevents using CUDA?
- From: Oliver Ruebenkoenig <firstname.lastname@example.org>
- Re: nVidia Optumus prevents using CUDA?