CUDA: Difference between revisions
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nvidia 0000:07:00.0: setting latency timer to 64 | nvidia 0000:07:00.0: setting latency timer to 64 | ||
NVRM: loading NVIDIA UNIX x86_64 Kernel Module 190.53 Wed Dec 9 15:29:46 PST 2009</pre> | NVRM: loading NVIDIA UNIX x86_64 Kernel Module 190.53 Wed Dec 9 15:29:46 PST 2009</pre> | ||
Once the module is loaded, CUDA should be able to find the device. See [[CUDA#deviceQuery_Output|below]] for sample outputs. Each device has a | Once the module is loaded, CUDA should be able to find the device. See [[CUDA#deviceQuery_Output|below]] for sample outputs. Each device has a [[CUDA#Compute_Capabilities|compute capability]], though this does not encompass all differentiated capabilities (see also <tt>deviceOverlap</tt> and <tt>canMapHostMemory</tt>...). Note that "emulation mode" has been removed as of CUDA Toolkit Version 3.1. | ||
==CUDA model== | ==CUDA model== | ||
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===Streaming Multiprocessor=== | ===Streaming Multiprocessor=== | ||
* Each SM has a register file, fast local (''shared'') memory, a cache for constant memory, an instruction cache (ROP), a multithreaded instruction dispatcher, and some number of [[#Stream Processor|Stream Processors]] (SPs). | * Each SM has a register file, fast local (''shared'') memory, a cache for constant memory, an instruction cache (ROP), a multithreaded instruction dispatcher, and some number of [[#Stream Processor|Stream Processors]] (SPs). | ||
** | ** 8K registers for compute capability <= 1.1, otherwise | ||
** | ** 16K for compute capability <= 1.3, otherwise | ||
** | ** 32K for compute capability <= 2.1, otherwise | ||
** | ** 64K through at least compute capability 3.5 | ||
* A group of threads which share a memory and can "synchronize their execution to coördinate accesses to memory" (use a [[barrier]]) form a '''block'''. Each thread has a ''threadId'' within its (three-dimensional) block. | * A group of threads which share a memory and can "synchronize their execution to coördinate accesses to memory" (use a [[barrier]]) form a '''block'''. Each thread has a ''threadId'' within its (three-dimensional) block. | ||
** For a block of dimensions <D<sub>x</sub>, D<sub>y</sub>, D<sub>z</sub>>, the threadId of the thread having index <x, y, z> is (x + y * D<sub>x</sub> + z * D<sub>y</sub> * D<sub>x</sub>). | ** For a block of dimensions <D<sub>x</sub>, D<sub>y</sub>, D<sub>z</sub>>, the threadId of the thread having index <x, y, z> is (x + y * D<sub>x</sub> + z * D<sub>y</sub> * D<sub>x</sub>). | ||