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CANN: Stream sync between devices for acl_graph (#15809)

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* CANN: Switch to stream synchronization

Switch to stream synchronization because events are not effective.

Co-authored-by: hipudding <huafengchun@gmail.com>

* CANN: add Comments

---------

Co-authored-by: hipudding <huafengchun@gmail.com>
This commit is contained in:
Chenguang Li
2025-09-08 10:03:29 +08:00
committed by GitHub
parent 3976dfbe00
commit 85ca66a746
1 changed files with 9 additions and 8 deletions
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17
ggml/src/ggml-cann/ggml-cann.cpp
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@@ -2092,16 +2092,17 @@ static bool ggml_backend_cann_cpy_tensor_async(
ACL_CHECK(aclrtMemcpyAsync(dst->data, copy_size, src->data, copy_size,
ACL_MEMCPY_DEVICE_TO_DEVICE,
cann_ctx_src->stream()));
// record event on src stream after the copy
if (!cann_ctx_src->copy_event) {
ACL_CHECK(aclrtCreateEventWithFlag(&cann_ctx_src->copy_event, ACL_EVENT_SYNC));
}
ACL_CHECK(aclrtRecordEvent(cann_ctx_src->copy_event, cann_ctx_src->stream()));
// TODO: this event is not effective with acl graph mode, change to use aclrtSynchronizeStream
// if (!cann_ctx_src->copy_event) {
// ACL_CHECK(aclrtCreateEventWithFlag(&cann_ctx_src->copy_event, ACL_EVENT_SYNC));
// }
// ACL_CHECK(aclrtRecordEvent(cann_ctx_src->copy_event, cann_ctx_src->stream()));
// wait on dst stream for the copy to complete
ggml_cann_set_device(cann_ctx_dst->device);
ACL_CHECK(aclrtStreamWaitEvent(cann_ctx_dst->stream(), cann_ctx_src->copy_event));
// // wait on dst stream for the copy to complete
// ggml_cann_set_device(cann_ctx_dst->device);
// ACL_CHECK(aclrtStreamWaitEvent(cann_ctx_dst->stream(), cann_ctx_src->copy_event));
ACL_CHECK(aclrtSynchronizeStream(cann_ctx_src->stream()));
} else {
// src and dst are on the same backend
ACL_CHECK(aclrtMemcpyAsync(dst->data, copy_size, src->data, copy_size,