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Reset schedule earlier to allow overlap with ggml graph computation on device #6933

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merged 3 commits into from
Apr 26, 2024
Merged

Reset schedule earlier to allow overlap with ggml graph computation on device #6933

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a2beaff
Reset schedule earlier to allow overlap with graph computation on device
agray3 Apr 26, 2024
34847ca
moved reset to end of llama_decode_internal
agray3 Apr 26, 2024
728562b
style fix
slaren Apr 26, 2024
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12 changes: 7 additions & 5 deletions ggml-backend.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1780,12 +1780,14 @@ void ggml_backend_sched_free(ggml_backend_sched_t sched) {

void ggml_backend_sched_reset(ggml_backend_sched_t sched) {
// reset state for the next run
size_t hash_size = sched->hash_set.size;
memset(sched->hash_set.keys, 0, sizeof(sched->hash_set.keys[0]) * hash_size); // NOLINT
memset(sched->tensor_backend_id, -1, sizeof(sched->tensor_backend_id[0]) * hash_size);
memset(sched->tensor_copies, 0, sizeof(sched->tensor_copies[0]) * hash_size);
if (!sched->is_reset) {
size_t hash_size = sched->hash_set.size;
memset(sched->hash_set.keys, 0, sizeof(sched->hash_set.keys[0]) * hash_size); // NOLINT
memset(sched->tensor_backend_id, -1, sizeof(sched->tensor_backend_id[0]) * hash_size);
memset(sched->tensor_copies, 0, sizeof(sched->tensor_copies[0]) * hash_size);

sched->is_reset = true;
sched->is_reset = true;
}
sched->is_alloc = false;
}

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4 changes: 4 additions & 0 deletions llama.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -11205,6 +11205,10 @@ static int llama_decode_internal(
}
}

// Reset state for the next token before backend sync, to allow the CPU activities in the reset to
// overlap with device computation.
ggml_backend_sched_reset(lctx.sched);

return 0;
}

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