Original post is here: eklausmeier.goip.de
This article "CUDA-Enabled GPUs" made me check my GPU again using deviceQuery in /usr/local/cuda/samples/sdk/1_Utilities/deviceQuery:
CUDA Device Query (Runtime API) version (CUDART static linking)
Detected 1 CUDA Capable device(s)
Device 0: "GeForce GTX 560"
CUDA Driver Version / Runtime Version 6.0 / 5.0
CUDA Capability Major/Minor version number: 2.1
Total amount of global memory: 1023 MBytes (1072889856 bytes)
( 7) Multiprocessors x ( 48) CUDA Cores/MP: 336 CUDA Cores
[more_WP_Tag] GPU Clock rate: 1660 MHz (1.66 GHz)
Memory Clock rate: 2004 Mhz
Memory Bus Width: 256-bit
L2 Cache Size: 524288 bytes
Max Texture Dimension Size (x,y,z) 1D=(65536), 2D=(65536,65535), 3D=(2048,2048,2048)
Max Layered Texture Size (dim) x layers 1D=(16384) x 2048, 2D=(16384,16384) x 2048
Total amount of constant memory: 65536 bytes
Total amount of shared memory per block: 49152 bytes
Total number of registers available per block: 32768
Warp size: 32
Maximum number of threads per multiprocessor: 1536
Maximum number of threads per block: 1024
Maximum sizes of each dimension of a block: 1024 x 1024 x 64
Maximum sizes of each dimension of a grid: 65535 x 65535 x 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
Device supports Unified Addressing (UVA): Yes
Device PCI Bus ID / PCI location ID: 1 / 0
Compute Mode:
deviceQuery, CUDA Driver = CUDART, CUDA Driver Version = 6.0, CUDA Runtime Version = 5.0, NumDevs = 1, Device0 = GeForce GTX 560
C++ program is roughly:
1cudaDriverGetVersion(&driverVersion);
2cudaRuntimeGetVersion(&runtimeVersion);
3getCudaAttribute<int>(&memoryClock, CU_DEVICE_ATTRIBUTE_MEMORY_CLOCK_RATE, dev);
4getCudaAttribute<int>(&memBusWidth, CU_DEVICE_ATTRIBUTE_GLOBAL_MEMORY_BUS_WIDTH, dev);
5getCudaAttribute<int>(&L2CacheSize, CU_DEVICE_ATTRIBUTE_L2_CACHE_SIZE, dev);
6
7// lots of printf() omitted
8printf(" (%2d) Multiprocessors x (%3d) CUDA Cores/MP: %d CUDA Cores\n",
9 deviceProp.multiProcessorCount,
10 _ConvertSMVer2Cores(deviceProp.major, deviceProp.minor),
11 _ConvertSMVer2Cores(deviceProp.major, deviceProp.minor) * deviceProp.multiProcessorCount);
12printf(" GPU Clock rate: %.0f MHz (%0.2f GHz)\n", deviceProp.clockRate * 1e-3f, deviceProp.clockRate * 1e-6f);
Some remarks concerning the relation between multiprocessors and CUDA cores.
The following graphic from "CUDA C Programming Guide", October 2012, shows the architectural difference between CPU and GPU, and in particular the large number of floating-point units, see CUDA C Programming Guide.
The multiprocessor architecture below is from "Parallel Thread Execution ISA Version 3.1", September 2012, i.e., the quasi NVidia assembler guide, see Parallel Thread Execution ISA Version.
For GPUGrid this GPU model GTX 560 gives decent performance and ranking:
And once again output from nvidia-smi, see CUDA Performance and Newer GPUGRID Tasks Keep GPU Really Hot:
Sun Dec 1 18:14:47 2013
+------------------------------------------------------+
| NVIDIA-SMI 331.20 Driver Version: 331.20 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GTX 560 Off | 0000:01:00.0 N/A | N/A |
| 62% 57C N/A N/A / N/A | 581MiB / 1023MiB | N/A Default |
+-------------------------------+----------------------+----------------------+
+-----------------------------------------------------------------------------+
| Compute processes: GPU Memory |
| GPU PID Process name Usage |
|=============================================================================|
| 0 Not Supported |
+-----------------------------------------------------------------------------+
Added 20-Jan-2018: GTX 560 is a Fermi architecture graphic card. It is supported up to CUDA-8, but no longer in CUDA-9. Output from deviceQuery program compiled with CUDA-9 gives wrong results!