Runtime:cudaHostAlloc(), use cudaHostAllocMapped flagDriver :cuMemHostAlloc()use CUDA_MEMHOSTALLOC_DEVICEMAP 3.Get a CUDA device pointer to this memory Runtime:cudaHostGetDevicePointer()Driver :cuMemHostGetDevicePointer() 4.Just use that pointer in your kernels! Zero-Copy Guidlines •Data...
Unified Memory offers a “single-pointer-to-data” model that is conceptually similar to CUDA’s zero-copy memory. One key difference between the two is that with zero-copy allocations the physical location of memory is pinned in CPU system memory such that a program may have fast or slow ...
同时,UVA也提出了“zero copy memory”的概念。zero copy mem是一种特殊的内存,被pin在了host 的物理内存页上,当device 需要的时候,可以通过PCI-e远程访问,不再需要使用memcopy。“zero copy mem”也可以看作一种在编程效率上的优化,但是可惜并不能对程序性能起到太大的帮助,因为零拷贝并不是无需拷贝,而是一...
Using features such as Zero-Copy Memory, Asynchronous Data Transfers, Unified Virtual Addressing, Peer-to-Peer Communication, Concurrent Kernels, and more Sharing data between CUDA and Direct3D/OpenGL graphics APIs (interoperability) Data-parallel algorithms and primitives for linear algebra operations: ...
与统一内存相似的, 有一种零复制内存(zero-copy memory), 相似之处是, 它们都提供了一种能被 CPU 和 GPU 都能访问到的存储器. 不同之处是, 零复制内存是主机内存, 而统一内存则将数据放在一个最合适的地方, 可能是设备, 也可能是主机. 所以如果使用零复制内存, 数据传输走 PCIe. 统一内存分配实验 以下...
D.2.2.1.2. Zero Copy Memory 零拷贝系统内存与全局内存具有相同的一致性和一致性保证,并遵循上面详述的语义。 内核可能不会分配或释放零拷贝内存,但可能会使用从主机程序传入的指向零拷贝的指针。 D.2.2.1.3. Constant Memory 常量是不可变的,不能从设备修改,即使在父子启动之间也是如此。 也就是说,所有__const...
UVA启用“零复制(Zero-Copy)” 内存,“零复制”内存是固定的主机内存,可由设备上的代码通过PCI-Express总线直接访问,而无需使用memcpy。零复制为统一内存模型提供了一些便利,但是却没有提高性能,因为它总是通过带宽低而且延迟高的PCI-Express进行访问。 UVA不会像统一内存模型一样自动将数据从一个物理位置迁移到另...
The simple zero-copy CUDA sample comes with a detailed document on the page-locked memory APIs. 3.2.4.1. Portable Memory A block of page-locked memory can be used in conjunction with any device in the system (seeMulti-Device Systemfor more details on multi-device systems), but by defa...
cudaDeviceScheduleAuto: The default value if the flags parameter is zero, uses a heuristic based on the number of active CUDA contexts in the process C and the number of logical processors in the system P. If C > P, then CUDA will yield to other OS threads when waiting for the device...
9.2.2.1.2. Zero Copy Memory 9.2.2.1.3. Constant Memory 9.2.2.1.4. Shared and Local Memory 9.2.2.1.5. Local Memory 9.2.2.1.6. Texture Memory 9.3. Programming Interface 9.3.1. CUDA C++ Reference 9.3.1.1. Device-Side Kernel Launch ...