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UCP/TAG: Tag offload bounce buffer optimization #4589

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Dec 20, 2019
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UCP/TAG: Tag offload bounce buffer optimization #4589

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5 changes: 4 additions & 1 deletion src/ucp/tag/offload.c
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Original file line number Diff line number Diff line change
Expand Up @@ -256,7 +256,10 @@ ucp_tag_offload_do_post(ucp_request_t *req)

mdi = context->tl_rscs[wiface->rsc_index].md_index;

if (ucs_unlikely(length >= worker->tm.offload.zcopy_thresh)) {
/* Do not use bounce buffer for receives to GPU memory to avoid
* cost of h2d transfers (i.e. cuda_copy from staging to dest memory). */
if ((length >= worker->tm.offload.zcopy_thresh) ||
!UCP_MEM_IS_ACCESSIBLE_FROM_CPU(req->recv.mem_type)) {
if (length > wiface->attr.cap.tag.recv.max_zcopy) {
/* Post maximum allowed length. If sender sends smaller message
* (which is allowed per MPI standard), max recv should fit it.
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