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ggml : add GGML_SCHED_NO_REALLOC option to disable reallocations in ggml_backend_sched (#17276)

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* ggml : add GGML_SCHED_NO_REALLOC option to disable reallocations in ggml_backend_sched
Enabled in ggml-ci for testing.

* llama : update worst-case graph for unified cache

* ci : disable op offload in some tests

* fix spelling

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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
This commit is contained in:
Diego Devesa
2025-11-28 07:33:23 -08:00
committed by GitHub
parent c6f7a423c8
commit e072b2052e
8 changed files with 37 additions and 20 deletions
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ggml/src/ggml-backend.cpp
+9 -3
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@@ -1395,14 +1395,20 @@ static bool ggml_backend_sched_alloc_splits(ggml_backend_sched_t sched) {
// allocate graph
if (backend_ids_changed || !ggml_gallocr_alloc_graph(sched->galloc, &sched->graph)) {
#ifdef GGML_SCHED_NO_REALLOC
GGML_ABORT("%s: failed to allocate graph, but graph re-allocation is disabled by GGML_SCHED_NO_REALLOC\n", __func__);
#endif
#ifndef NDEBUG
GGML_LOG_DEBUG("%s: failed to allocate graph, reserving (backend_ids_changed = %d)\n", __func__, backend_ids_changed);
#endif
// the re-allocation may cause the split inputs to be moved to a different address
// synchronize without ggml_backend_sched_synchronize to avoid changing cur_copy
for (int i = 0; i < sched->n_backends; i++) {
ggml_backend_synchronize(sched->backends[i]);
}
#ifndef NDEBUG
GGML_LOG_DEBUG("%s: failed to allocate graph, reserving (backend_ids_changed = %d)\n", __func__, backend_ids_changed);
#endif
ggml_gallocr_reserve_n(sched->galloc, &sched->graph, sched->node_backend_ids, sched->leaf_backend_ids);
if (!ggml_gallocr_alloc_graph(sched->galloc, &sched->graph)) {
GGML_LOG_ERROR("%s: failed to allocate graph\n", __func__);