What is global memory in CUDA?
The global memory is a high-latency memory (the slowest in the figure). It supports short-latency, high-bandwidth, read-only access by the device when all threads simultaneously access the same location. There is a total of 64K constant memory on a CUDA capable device. The constant memory is cached.
Can CUDA use shared GPU memory?
This type of memory is what integrated graphics eg Intel HD series typically use. This is not on your NVIDIA GPU, and CUDA can’t use it. Tensorflow can’t use it when running on GPU because CUDA can’t use it, and also when running on CPU because it’s reserved for graphics.
Is shared memory slower than global?
Because it is on-chip, shared memory has a much higher bandwidth and lower latency than global memory. But this speed increase requires that your application have no bank conflicts between threads. These occur when all threads in a warp access the same location in shared memory.
What is global shared memory?
The global memory is the total amount of DRAM of the GPU you are using. e.g I use GTX460M which has 1536 MB DRAM, therefore 1536 MB global memory. Shared memory is specified by the device architecture and is measured on per-block basis.
What is global memory?
The global memory is defined as the region of system memory that is accessible to both the OpenCL™ host and device. There is a handshake between host and device over control of the data stored in this memory. The host processor transfers data from the host memory space into the global memory space.
What is the difference between shared memory and registers?
Specifically, shared memory serves as a cache for the threads in a thread block, while registers allow “caching” of data in a single thread.
Is unified memory better than RAM?
The Unified Memory Architecture doesn’t mean you need less RAM; it’s just faster and more efficient throughput between the RAM and the devices that need to use and access it.
Is shared memory faster?
Shared memory is the fastest form of interprocess communication. The main advantage of shared memory is that the copying of message data is eliminated. The usual mechanism for synchronizing shared memory access is semaphores.
Why is shared memory slow?
2 Answers. If you are only using the data once and there is no data reuse between different threads in a block, then using shared memory will actually be slower. The reason is that when you copy data from global memory to shared, it still counts as a global transaction.
Is shared memory Slow?
So, in general, shared memory should be just as fast as any other memory for most accesses, but, depending on what you put there, and how many different threads/processes access it, you can get some slowdown for specific usage patterns.
What are the advantages of shared memory?
What is global memory in computer?
[′glō·bəl ′mem·rē] (computer science) Computer storage that can be used by a number of processors connected together in a multiprocessor system.