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. 2015 Feb 13;6:42. doi: 10.3389/fphys.2015.00042

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Copyright © 2015 Sumiyoshi, Hirata, Hiroi and Funahashi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Uncoalesced and coalesced access to global memory. Stick figures indicate the threads that access global memory for the storage of the simulation results. In (A), threads 1 and 4 have already finished storing their results for the first step and are attempting to store the results for the second step; threads 2 and 3 are attempting to store their results for the first step. This is an example of uncoalesced access. In (B), shared memory is used to temporarily store the simulation results, which are later transferred together to global memory. This is an example of coalesced access.