Re: CUDA Fatal Error While Trying to Run Under Windows 8.1

From: Jim Phillips (jim_at_ks.uiuc.edu)
Date: Thu Nov 06 2014 - 13:00:35 CST

My guess is that NAMD is ignoring your GPU because it only has two
multiprocessors. You can override this by adding "+devices 0" to the
command line (which means "use device 0", not "use 0 devices").

Jim

On Thu, 6 Nov 2014, Justin Sanders wrote:

> Hello,
>
> I am trying to get the latest binaries of NAMD (2014-08-22) for Windows-64
> with CUDA to run on my laptop running Windows 8.1. When I started to run a
> simulation under VEGA ZZ, it gave me the following error:
>
>
>
> FATAL ERROR: CUDA error on Pe 2 (Kaori device 0): All CUDA devices are in
> prohibited mode, of compute capability 1.0, unable to map host memory, too
> small, or otherwise unusable.
>
>
>
> I checked the drivers and they are up to date. I ran samples from the most
> recent CUDA toolkit (v 6.5) that I installed. The GPU was available and
> communicating with the computer. But when tried to run the sample program,
> it failed. I discovered that in my laptop, I had to set for programs to
> have access to the GPU. After adjusting the setting, the sample program
> worked. But NAMD still gives me the same error.
>
>
>
> I was reading in the manual about ld_library_path variable. Is this part of
> the problem? And if so, how would I go about setting it in Windows 8.1? I
> have set environment variables in WinXP and IRIX before but not in 8.1.
>
>
>
> Thank you.
>
> Justin
>
>
>
> P.S. Attached below is the output from the deviceQuery program distributed
> in the CUDA Toolkit with technical information about the driver and GPU.
>
>
>
> CUDA Device Query (Runtime API) version (CUDART static linking)
>
>
>
> Detected 1 CUDA Capable device(s)
>
> Device 0: "GeForce GT 740M"
>
> CUDA Driver Version / Runtime Version 6.5 / 6.5
>
> CUDA Capability Major/Minor version number: 3.5
>
> Total amount of global memory: 2048 MBytes (2147483648
> bytes)
>
> ( 2) Multiprocessors, (192) CUDA Cores/MP: 384 CUDA Cores
>
> GPU Clock rate: 1033 MHz (1.03 GHz)
>
> Memory Clock rate: 800 Mhz
>
> Memory Bus Width: 64-bit
>
> L2 Cache Size: 524288 bytes
>
> Maximum Texture Dimension Size (x,y,z) 1D=(65536), 2D=(65536,
> 65536),
>
> 3D=(4096, 4096, 4096)
>
> Maximum Layered 1D Texture Size, (num) layers 1D=(16384), 2048 layers
>
> Maximum Layered 2D Texture Size, (num) layers 2D=(16384, 16384), 2048
> layers
>
> Total amount of constant memory: 65536 bytes
>
> Total amount of shared memory per block: 49152 bytes
>
> Total number of registers available per block: 65536
>
> Warp size: 32
>
> Maximum number of threads per multiprocessor: 2048
>
> Maximum number of threads per block: 1024
>
> Max dimension size of a thread block (x,y,z): (1024, 1024, 64)
>
> Max dimension size of a grid size (x,y,z): (2147483647, 65535, 65535)
>
> Maximum memory pitch: 2147483647 bytes
>
> Texture alignment: 512 bytes
>
> Concurrent copy and kernel execution: Yes with 1 copy engine(s)
>
> Run time limit on kernels: Yes
>
> Integrated GPU sharing Host Memory: No
>
> Support host page-locked memory mapping: Yes
>
> Alignment requirement for Surfaces: Yes
>
> Device has ECC support: Disabled
>
> CUDA Device Driver Mode (TCC or WDDM): WDDM (Windows Display
> Driver Mo
>
> del)
>
> Device supports Unified Addressing (UVA): Yes
>
> Device PCI Bus ID / PCI location ID: 4 / 0
>
> Compute Mode:
>
> < Default (multiple host threads can use ::cudaSetDevice() with device
> simu
>
> ltaneously) >
>
>
>
> deviceQuery, CUDA Driver = CUDART, CUDA Driver Version = 6.5, CUDA Runtime
> Versi
>
> on = 6.5, NumDevs = 1, Device0 = GeForce GT 740M
>
> Result = PASS
>

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