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ggml: add env var GGML_OP_OFFLOAD_MIN_BATCH (#18535)

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* ggml: add env var GGML_OP_OFFLOAD_MIN_BATCH
* makes the min_batch_size for triggering op offload configurable via env var, defaulting to the prior hardcoded value of 32

* ggml: read GGML_OP_OFFLOAD_MIN_BATCH once and store to dev ctx

* cann: forward declaration of device context struct

* cann: move offload op check after device context declaration

* cuda: fix whitespace

Co-authored-by: Aman Gupta <amangupta052@gmail.com>

---------

Co-authored-by: Aman Gupta <amangupta052@gmail.com>
This commit is contained in:
Doctor Shotgun
2026-01-08 11:03:21 +02:00
committed by GitHub
co-authored by Aman Gupta
parent 9c142e3a2a
commit 9a5724dee2
7 changed files with 45 additions and 38 deletions
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ggml/src/ggml-cuda/ggml-cuda.cu
+5 -4
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@@ -4122,6 +4122,7 @@ struct ggml_backend_cuda_device_context {
std::string name;
std::string description;
std::string pci_bus_id;
int op_offload_min_batch_size;
};
static const char * ggml_backend_cuda_device_get_name(ggml_backend_dev_t dev) {
@@ -4676,11 +4677,9 @@ static int64_t get_op_batch_size(const ggml_tensor * op) {
}
static bool ggml_backend_cuda_device_offload_op(ggml_backend_dev_t dev, const ggml_tensor * op) {
const int min_batch_size = 32;
ggml_backend_cuda_device_context * dev_ctx = (ggml_backend_cuda_device_context *) dev->context;
return get_op_batch_size(op) >= min_batch_size;
GGML_UNUSED(dev);
return get_op_batch_size(op) >= dev_ctx->op_offload_min_batch_size;
}
static ggml_backend_event_t ggml_backend_cuda_device_event_new(ggml_backend_dev_t dev) {
@@ -4848,6 +4847,7 @@ ggml_backend_reg_t ggml_backend_cuda_reg() {
std::lock_guard<std::mutex> lock(mutex);
if (!initialized) {
ggml_backend_cuda_reg_context * ctx = new ggml_backend_cuda_reg_context;
const int min_batch_size = getenv("GGML_OP_OFFLOAD_MIN_BATCH") ? atoi(getenv("GGML_OP_OFFLOAD_MIN_BATCH")) : 32;
for (int i = 0; i < ggml_cuda_info().device_count; i++) {
ggml_backend_cuda_device_context * dev_ctx = new ggml_backend_cuda_device_context;
@@ -4861,6 +4861,7 @@ ggml_backend_reg_t ggml_backend_cuda_reg() {
char pci_bus_id[16] = {};
snprintf(pci_bus_id, sizeof(pci_bus_id), "%04x:%02x:%02x.0", prop.pciDomainID, prop.pciBusID, prop.pciDeviceID);
dev_ctx->pci_bus_id = pci_bus_id;
dev_ctx->op_offload_min_batch_size = min_batch_size;
ggml_backend_dev_t dev = new ggml_backend_device {
/* .iface = */ ggml_backend_cuda_device_interface,