By Wen-mei W. Hwu
His is the second one quantity of Morgan Kaufmanns GPU Computing gemstones, providing an all-new set of insights, principles, and useful «hands-on» abilities from researchers and builders world wide. each one bankruptcy delivers a window into the paintings being played throughout numerous software domain names, and the chance to witness the effect of parallel GPU computing at the potency of clinical learn.
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Extra resources for GPU Computing Gems Jade Edition
However, rather than computing a cumulative result, it returns the “ballot” of predicates provided by each thread in the warp. ballot() provides a mechanism for quickly broadcasting one bit per thread among all the threads of a warp without using shared memory. Finally, the Fermi architecture provides a new class of barrier intrinsics that simultaneously synchronize all the threads of a thread block and perform a reduction across a per-thread predicate. The three barrier intrinsics are: int syncthreads count(int p) Executes a barrier equivalent to syncthreads() and returns the count of non-zero predicates p.
4] Y. K. -P. Sloan, C. Boyd, J. Manferdelli, Fast scan algorithms on graphics processors, in: Proceedings of the 22nd Annual International Conference on Supercomputing, ACM, 2008, pp. 205–213. id=1375527&picked=prox.  S. Sengupta, M. Harris, M. Garland, Efficient Parallel scan algorithms for GPUs, Technical Report NVR2008-003, NVIDIA Corporation, 2008.  M. Billeter, O. Olsson, U. Assarsson, Efficient stream compaction on wide SIMD many-core architectures, in: HPG ’09: Proceedings of the Conference on High Performance Graphics 2009, ACM, New York, 2009, pp.
Every thread receives the same 32-bit ballot containing the predicate bits from all threads in its warp, but it only counts the predicates from threads that have a lower index. 3. For each lane k, lanemask lt computes a 32-bit mask whose bits are 1 in positions less than k and 0 everywhere else. To compute the prefix sums, each thread applies its mask to the 32-bit ballot, and then counts the remaining bits using popc(). By modifying the construction of the mask, we can construct the four fundamental prefix sums operations: 1.