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

* 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

---------

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 Georgi Gerganov
parent c372bdbb3c
commit 463003e76c
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GPG Key ID: 449E073F9DC10735
4 changed files with 22 additions and 6 deletions
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1
ggml/CMakeLists.txt
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@ -183,6 +183,7 @@ endif()
# ggml core
set(GGML_SCHED_MAX_COPIES "4" CACHE STRING "ggml: max input copies for pipeline parallelism")
option(GGML_CPU "ggml: enable CPU backend" ON)
option(GGML_SCHED_NO_REALLOC "ggml: disallow reallocations in ggml-alloc (for debugging)" OFF)
# 3rd party libs / backends
option(GGML_ACCELERATE "ggml: enable Accelerate framework" ON)

4
ggml/src/CMakeLists.txt
View File

@ -221,6 +221,10 @@ if (GGML_BACKEND_DL)
target_compile_definitions(ggml-base PUBLIC GGML_BACKEND_DL)
endif()
if (GGML_SCHED_NO_REALLOC)
target_compile_definitions(ggml-base PUBLIC GGML_SCHED_NO_REALLOC)
endif()
add_library(ggml
ggml-backend-reg.cpp)
add_library(ggml::ggml ALIAS ggml)

11
ggml/src/ggml-alloc.c
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@ -921,10 +921,15 @@ bool ggml_gallocr_reserve_n(ggml_gallocr_t galloc, struct ggml_cgraph * graph, c
}
if (realloc) {
#ifndef NDEBUG
size_t cur_size = galloc->buffers[i] ? ggml_vbuffer_size(galloc->buffers[i]) : 0;
GGML_LOG_DEBUG("%s: reallocating %s buffer from size %.02f MiB to %.02f MiB\n", __func__, ggml_backend_buft_name(galloc->bufts[i]), cur_size / 1024.0 / 1024.0, new_size / 1024.0 / 1024.0);
{
size_t cur_size = galloc->buffers[i] ? ggml_vbuffer_size(galloc->buffers[i]) : 0;
if (cur_size > 0) {
GGML_LOG_DEBUG("%s: reallocating %s buffer from size %.02f MiB to %.02f MiB\n",
__func__, ggml_backend_buft_name(galloc->bufts[i]),
cur_size / 1024.0 / 1024.0, new_size / 1024.0 / 1024.0);
}
}
#endif
ggml_vbuffer_free(galloc->buffers[i]);
galloc->buffers[i] = ggml_vbuffer_alloc(galloc->bufts[i], galloc->buf_tallocs[i], GGML_BACKEND_BUFFER_USAGE_COMPUTE);
if (galloc->buffers[i] == NULL) {

12
ggml/src/ggml-backend.cpp
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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__);