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metal : support virtual devices (#18919)

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* metal : support virtual devices

* cont : manage buffer type context memory

* metal : add events

* cont : implement cpy_tensor_async
This commit is contained in:
Georgi Gerganov
2026-02-02 14:29:44 +02:00
committed by GitHub
parent 6156ae5111
commit 6fdddb4987
7 changed files with 508 additions and 127 deletions
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ggml/src/ggml-metal/ggml-metal.cpp
+318 -108
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@@ -7,11 +7,12 @@
#include "ggml-metal-context.h"
#include "ggml-metal-ops.h"
// globals
#define GGML_METAL_NAME "MTL"
#define GGML_METAL_MAX_DEVICES 16
// initialized in ggml_backend_metal_reg
static ggml_backend_reg g_ggml_metal_reg;
static ggml_backend_device g_ggml_metal_device;
// number of Metal devices
// note: can be overriden with GGML_METAL_DEVICES env to simulate virtual devices
static int g_devices = 1;
////////////////////////////////////////////////////////////////////////////////
// backend interface
@@ -165,10 +166,28 @@ static ggml_backend_buffer_i ggml_backend_metal_buffer_private_i = {
/* .reset = */ NULL,
};
static bool ggml_backend_buffer_is_metal(ggml_backend_buffer_t buffer) {
return buffer->iface.free_buffer == ggml_backend_metal_buffer_shared_free_buffer ||
buffer->iface.free_buffer == ggml_backend_metal_buffer_private_free_buffer;
}
//
// buffer types
//
struct ggml_backend_metal_buffer_type {
int device;
std::string name;
};
struct ggml_backend_metal_buffer_type_deleter {
void operator()(ggml_backend_metal_buffer_type * ctx) const {
delete ctx;
}
};
typedef std::unique_ptr<ggml_backend_metal_buffer_type, ggml_backend_metal_buffer_type_deleter> ggml_backend_metal_buffer_type_ptr;
// common method for allocating shread or private Metal buffers
static ggml_backend_buffer_t ggml_backend_metal_buffer_type_alloc_buffer(ggml_backend_buffer_type_t buft, size_t size, bool shared) {
ggml_metal_device_t ctx_dev = (ggml_metal_device_t)buft->device->context;
@@ -218,9 +237,9 @@ static size_t ggml_backend_metal_buffer_type_get_alloc_size(ggml_backend_buffer_
// default (shared) buffer type
static const char * ggml_backend_metal_buffer_type_shared_get_name(ggml_backend_buffer_type_t buft) {
return "Metal";
ggml_backend_metal_buffer_type * ctx = (ggml_backend_metal_buffer_type *)buft->context;
GGML_UNUSED(buft);
return ctx->name.c_str();
}
static ggml_backend_buffer_t ggml_backend_metal_buffer_type_shared_alloc_buffer(ggml_backend_buffer_type_t buft, size_t size) {
@@ -249,29 +268,54 @@ static bool ggml_backend_metal_buffer_type_shared_is_host(ggml_backend_buffer_ty
GGML_UNUSED(buft);
}
static ggml_backend_buffer_type_t ggml_backend_metal_buffer_type_shared(void) {
static ggml_backend_buffer_type ggml_backend_buffer_type_metal = {
/* .iface = */ {
/* .get_name = */ ggml_backend_metal_buffer_type_shared_get_name,
/* .alloc_buffer = */ ggml_backend_metal_buffer_type_shared_alloc_buffer,
/* .get_alignment = */ ggml_backend_metal_buffer_type_shared_get_alignment,
/* .get_max_size = */ ggml_backend_metal_buffer_type_shared_get_max_size,
/* .get_alloc_size = */ ggml_backend_metal_buffer_type_shared_get_alloc_size,
/* .is_host = */ ggml_backend_metal_buffer_type_shared_is_host,
},
/* .device = */ &g_ggml_metal_device,
/* .context = */ NULL,
};
static ggml_backend_buffer_type_t ggml_backend_metal_buffer_type_shared(int device) {
static std::mutex mutex;
std::lock_guard<std::mutex> lock(mutex);
return &ggml_backend_buffer_type_metal;
static std::vector<ggml_backend_buffer_type> bufts;
static std::vector<ggml_backend_metal_buffer_type_ptr> ctxs;
static bool initialized = false;
if (!initialized) {
bufts.reserve(g_devices);
ctxs.reserve(g_devices);
for (int i = 0; i < g_devices; ++i) {
ggml_backend_metal_buffer_type * raw_ctx =
new ggml_backend_metal_buffer_type {
/* .device = */ i,
/* .name = */ GGML_METAL_NAME + std::to_string(i),
};
ctxs.emplace_back(raw_ctx);
ggml_backend_buffer_type buft = {
/* .iface = */ {
/* .get_name = */ ggml_backend_metal_buffer_type_shared_get_name,
/* .alloc_buffer = */ ggml_backend_metal_buffer_type_shared_alloc_buffer,
/* .get_alignment = */ ggml_backend_metal_buffer_type_shared_get_alignment,
/* .get_max_size = */ ggml_backend_metal_buffer_type_shared_get_max_size,
/* .get_alloc_size = */ ggml_backend_metal_buffer_type_shared_get_alloc_size,
/* .is_host = */ ggml_backend_metal_buffer_type_shared_is_host,
},
/* .device = */ ggml_backend_reg_dev_get(ggml_backend_metal_reg(), i),
/* .context = */ raw_ctx,
};
bufts.emplace_back(buft);
}
initialized = true;
}
return &bufts[device];
}
// default (private) buffer type
static const char * ggml_backend_metal_buffer_type_private_get_name(ggml_backend_buffer_type_t buft) {
return "Metal_Private";
ggml_backend_metal_buffer_type * ctx = (ggml_backend_metal_buffer_type *)buft->context;
GGML_UNUSED(buft);
return ctx->name.c_str();
}
static ggml_backend_buffer_t ggml_backend_metal_buffer_type_private_alloc_buffer(ggml_backend_buffer_type_t buft, size_t size) {
@@ -300,29 +344,53 @@ static bool ggml_backend_metal_buffer_type_private_is_host(ggml_backend_buffer_t
GGML_UNUSED(buft);
}
static ggml_backend_buffer_type_t ggml_backend_metal_buffer_type_private(void) {
static ggml_backend_buffer_type ggml_backend_buffer_type_metal = {
/* .iface = */ {
/* .get_name = */ ggml_backend_metal_buffer_type_private_get_name,
/* .alloc_buffer = */ ggml_backend_metal_buffer_type_private_alloc_buffer,
/* .get_alignment = */ ggml_backend_metal_buffer_type_private_get_alignment,
/* .get_max_size = */ ggml_backend_metal_buffer_type_private_get_max_size,
/* .get_alloc_size = */ ggml_backend_metal_buffer_type_private_get_alloc_size,
/* .is_host = */ ggml_backend_metal_buffer_type_private_is_host,
},
/* .device = */ &g_ggml_metal_device,
/* .context = */ NULL,
};
static ggml_backend_buffer_type_t ggml_backend_metal_buffer_type_private(int device) {
static std::mutex mutex;
std::lock_guard<std::mutex> lock(mutex);
return &ggml_backend_buffer_type_metal;
static std::vector<ggml_backend_buffer_type> bufts;
static std::vector<ggml_backend_metal_buffer_type_ptr> ctxs;
static bool initialized = false;
if (!initialized) {
bufts.reserve(g_devices);
ctxs.reserve(g_devices);
for (int i = 0; i < g_devices; ++i) {
ggml_backend_metal_buffer_type * raw_ctx = new ggml_backend_metal_buffer_type{
/* .device = */ i,
/* .name = */ GGML_METAL_NAME + std::to_string(i) + "_Private"
};
ctxs.emplace_back(raw_ctx);
ggml_backend_buffer_type buft = {
/* .iface = */ {
/* .get_name = */ ggml_backend_metal_buffer_type_private_get_name,
/* .alloc_buffer = */ ggml_backend_metal_buffer_type_private_alloc_buffer,
/* .get_alignment = */ ggml_backend_metal_buffer_type_private_get_alignment,
/* .get_max_size = */ ggml_backend_metal_buffer_type_private_get_max_size,
/* .get_alloc_size = */ ggml_backend_metal_buffer_type_private_get_alloc_size,
/* .is_host = */ ggml_backend_metal_buffer_type_private_is_host,
},
/* .device = */ ggml_backend_reg_dev_get(ggml_backend_metal_reg(), i),
/* .context = */ raw_ctx,
};
bufts.emplace_back(buft);
}
initialized = true;
}
return &bufts[device];
}
// mapped buffer type
static const char * ggml_backend_metal_buffer_type_mapped_get_name(ggml_backend_buffer_type_t buft) {
return "Metal_Mapped";
ggml_backend_metal_buffer_type * ctx = (ggml_backend_metal_buffer_type *)buft->context;
GGML_UNUSED(buft);
return ctx->name.c_str();
}
static ggml_backend_buffer_t ggml_backend_metal_buffer_type_mapped_alloc_buffer(ggml_backend_buffer_type_t buft, size_t size) {
@@ -352,31 +420,55 @@ static bool ggml_backend_metal_buffer_type_mapped_is_host(ggml_backend_buffer_ty
GGML_UNUSED(buft);
}
static ggml_backend_buffer_type_t ggml_backend_metal_buffer_type_mapped(void) {
// note: not obvious, but this buffer type still needs to implement .alloc_buffer:
// https://github.com/ggml-org/llama.cpp/pull/15832#discussion_r2333177099
static ggml_backend_buffer_type ggml_backend_buffer_type_mapped_metal = {
/* .iface = */ {
/* .get_name = */ ggml_backend_metal_buffer_type_mapped_get_name,
/* .alloc_buffer = */ ggml_backend_metal_buffer_type_mapped_alloc_buffer,
/* .get_alignment = */ ggml_backend_metal_buffer_type_mapped_get_alignment,
/* .get_max_size = */ ggml_backend_metal_buffer_type_mapped_get_max_size,
/* .get_alloc_size = */ ggml_backend_metal_buffer_type_mapped_get_alloc_size,
/* .is_host = */ ggml_backend_metal_buffer_type_mapped_is_host,
},
/* .device = */ &g_ggml_metal_device,
/* .context = */ NULL,
};
static ggml_backend_buffer_type_t ggml_backend_metal_buffer_type_mapped(int device) {
static std::mutex mutex;
std::lock_guard<std::mutex> lock(mutex);
return &ggml_backend_buffer_type_mapped_metal;
static std::vector<ggml_backend_buffer_type> bufts;
static std::vector<ggml_backend_metal_buffer_type_ptr> ctxs;
static bool initialized = false;
if (!initialized) {
bufts.reserve(g_devices);
ctxs.reserve(g_devices);
for (int i = 0; i < g_devices; ++i) {
ggml_backend_metal_buffer_type * raw_ctx = new ggml_backend_metal_buffer_type{
/* .device = */ i,
/* .name = */ GGML_METAL_NAME + std::to_string(i) + "_Mapped"
};
ctxs.emplace_back(raw_ctx);
// note: not obvious, but this buffer type still needs to implement .alloc_buffer:
// https://github.com/ggml-org/llama.cpp/pull/15832#discussion_r2333177099
ggml_backend_buffer_type buft = {
/* .iface = */ {
/* .get_name = */ ggml_backend_metal_buffer_type_mapped_get_name,
/* .alloc_buffer = */ ggml_backend_metal_buffer_type_mapped_alloc_buffer,
/* .get_alignment = */ ggml_backend_metal_buffer_type_mapped_get_alignment,
/* .get_max_size = */ ggml_backend_metal_buffer_type_mapped_get_max_size,
/* .get_alloc_size = */ ggml_backend_metal_buffer_type_mapped_get_alloc_size,
/* .is_host = */ ggml_backend_metal_buffer_type_mapped_is_host,
},
/* .device = */ ggml_backend_reg_dev_get(ggml_backend_metal_reg(), i),
/* .context = */ raw_ctx,
};
bufts.emplace_back(buft);
}
initialized = true;
}
return &bufts[device];
}
// backend
static const char * ggml_backend_metal_name(ggml_backend_t backend) {
return "Metal";
ggml_metal_t ctx = (ggml_metal_t)backend->context;
GGML_UNUSED(backend);
return ggml_metal_get_name(ctx);
}
static void ggml_backend_metal_free(ggml_backend_t backend) {
@@ -409,12 +501,24 @@ static void ggml_backend_metal_get_tensor_async(ggml_backend_t backend, const gg
}
static bool ggml_backend_metal_cpy_tensor_async(ggml_backend_t backend_src, ggml_backend_t backend_dst, const ggml_tensor * src, ggml_tensor * dst) {
return false;
if (!ggml_backend_is_metal(backend_src) || !ggml_backend_is_metal(backend_dst)) {
return false;
}
GGML_UNUSED(backend_src);
GGML_UNUSED(backend_dst);
GGML_UNUSED(src);
GGML_UNUSED(dst);
if (!ggml_backend_buffer_is_metal(src->buffer) || !ggml_backend_buffer_is_metal(dst->buffer)) {
return false;
}
ggml_metal_t ctx_src = (ggml_metal_t)backend_src->context;
ggml_metal_t ctx_dst = (ggml_metal_t)backend_dst->context;
//ggml_backend_buffer_t buf_src = src->view_src ? src->view_src->buffer : src->buffer;
//ggml_backend_buffer_t buf_dst = dst->view_src ? dst->view_src->buffer : dst->buffer;
//ggml_metal_buffer_t buf_ctx_src = (ggml_metal_buffer_t)buf_src->context;
//ggml_metal_buffer_t buf_ctx_dst = (ggml_metal_buffer_t)buf_dst->context;
return ggml_metal_cpy_tensor_async(ctx_src, ctx_dst, src, dst);
}
static enum ggml_status ggml_backend_metal_graph_compute(ggml_backend_t backend, ggml_cgraph * cgraph) {
@@ -423,6 +527,20 @@ static enum ggml_status ggml_backend_metal_graph_compute(ggml_backend_t backend,
return ggml_metal_graph_compute(ctx, cgraph);
}
static void ggml_backend_metal_event_record(ggml_backend_t backend, ggml_backend_event_t event) {
ggml_metal_t ctx = (ggml_metal_t)backend->context;
ggml_metal_event_t ev = (ggml_metal_event_t)event->context;
ggml_metal_event_record(ctx, ev);
}
static void ggml_backend_metal_event_wait(ggml_backend_t backend, ggml_backend_event_t event) {
ggml_metal_t ctx = (ggml_metal_t)backend->context;
ggml_metal_event_t ev = (ggml_metal_event_t)event->context;
ggml_metal_event_wait(ctx, ev);
}
static void ggml_backend_metal_graph_optimize(ggml_backend_t backend, ggml_cgraph * cgraph) {
ggml_metal_t ctx = (ggml_metal_t)backend->context;
@@ -435,7 +553,6 @@ static void ggml_backend_metal_set_n_cb(ggml_backend_t backend, int n_cb) {
ggml_metal_t ctx = (ggml_metal_t)backend->context;
ggml_metal_set_n_cb(ctx, n_cb);
}
static ggml_backend_i ggml_backend_metal_i = {
@@ -450,12 +567,8 @@ static ggml_backend_i ggml_backend_metal_i = {
/* .graph_plan_update = */ NULL,
/* .graph_plan_compute = */ NULL,
/* .graph_compute = */ ggml_backend_metal_graph_compute,
// the events API is needed only for multi-GPU setups, so likely no need to implement it for Metal
// in any case, these docs seem relevant if we ever decide to implement it:
// https://developer.apple.com/documentation/metal/mtlcommandbuffer#Synchronizing-Passes-with-Events
/* .event_record = */ NULL,
/* .event_wait = */ NULL,
/* .event_record = */ ggml_backend_metal_event_record,
/* .event_wait = */ ggml_backend_metal_event_wait,
/* .graph_optimize = */ ggml_backend_metal_graph_optimize,
};
@@ -519,15 +632,17 @@ void ggml_backend_metal_capture_next_compute(ggml_backend_t backend) {
// backend device
static const char * ggml_backend_metal_device_get_name(ggml_backend_dev_t dev) {
return "Metal";
ggml_metal_device_t ctx_dev = (ggml_metal_device_t)dev->context;
GGML_UNUSED(dev);
const ggml_metal_device_props * props_dev = ggml_metal_device_get_props(ctx_dev);
return props_dev->name;
}
static const char * ggml_backend_metal_device_get_description(ggml_backend_dev_t dev) {
ggml_metal_device_t ctx_dev = (ggml_metal_device_t)dev->context;
return ggml_metal_device_get_props(ctx_dev)->name;
return ggml_metal_device_get_props(ctx_dev)->desc;
}
static void ggml_backend_metal_device_get_memory(ggml_backend_dev_t dev, size_t * free, size_t * total) {
@@ -550,14 +665,14 @@ static void ggml_backend_metal_device_get_props(ggml_backend_dev_t dev, ggml_bac
ggml_backend_metal_device_get_memory(dev, &props->memory_free, &props->memory_total);
props->caps = {
/* .async = */ true,
/* .host_buffer = */ false,
/* .buffer_from_host_ptr = */ true,
/* .events = */ false,
/* .async = */ true,
/* .host_buffer = */ false,
/* .buffer_from_host_ptr = */ true,
/* .events = */ true,
};
}
static ggml_backend_t ggml_backend_metal_device_init(ggml_backend_dev_t dev, const char * params) {
static ggml_backend_t ggml_backend_metal_device_init_backend(ggml_backend_dev_t dev, const char * params) {
ggml_metal_device_t ctx_dev = (ggml_metal_device_t)dev->context;
ggml_metal_t ctx = ggml_metal_init(ctx_dev);
@@ -587,7 +702,7 @@ static ggml_backend_buffer_type_t ggml_backend_metal_device_get_buffer_type(ggml
const ggml_metal_device_props * props_dev = ggml_metal_device_get_props(ctx_dev);
return props_dev->use_shared_buffers ? ggml_backend_metal_buffer_type_shared() : ggml_backend_metal_buffer_type_private();
return props_dev->use_shared_buffers ? ggml_backend_metal_buffer_type_shared(props_dev->device) : ggml_backend_metal_buffer_type_private(props_dev->device);
}
static ggml_backend_buffer_t ggml_backend_metal_device_buffer_mapped(ggml_backend_dev_t dev, void * ptr, size_t size, size_t max_tensor_size) {
@@ -595,7 +710,9 @@ static ggml_backend_buffer_t ggml_backend_metal_device_buffer_mapped(ggml_backen
ggml_metal_buffer_t res = ggml_metal_buffer_map(ctx_dev, ptr, size, max_tensor_size);
return ggml_backend_buffer_init(ggml_backend_metal_buffer_type_mapped(), ggml_backend_metal_buffer_shared_i, res, size);
const ggml_metal_device_props * props_dev = ggml_metal_device_get_props(ctx_dev);
return ggml_backend_buffer_init(ggml_backend_metal_buffer_type_mapped(props_dev->device), ggml_backend_metal_buffer_shared_i, res, size);
}
static bool ggml_backend_metal_device_supports_op(ggml_backend_dev_t dev, const ggml_tensor * op) {
@@ -606,9 +723,10 @@ static bool ggml_backend_metal_device_supports_op(ggml_backend_dev_t dev, const
static bool ggml_backend_metal_device_supports_buft(ggml_backend_dev_t dev, ggml_backend_buffer_type_t buft) {
return
buft->device == dev && (
buft->iface.get_name == ggml_backend_metal_buffer_type_shared_get_name ||
buft->iface.get_name == ggml_backend_metal_buffer_type_private_get_name ||
buft->iface.get_name == ggml_backend_metal_buffer_type_mapped_get_name;
buft->iface.get_name == ggml_backend_metal_buffer_type_mapped_get_name);
GGML_UNUSED(dev);
}
@@ -632,45 +750,97 @@ static bool ggml_backend_metal_device_offload_op(ggml_backend_dev_t dev, const g
get_op_batch_size(op) >= ggml_metal_device_get_props(ctx_dev)->op_offload_min_batch_size;
}
static ggml_backend_event_t ggml_backend_metal_device_event_new(ggml_backend_dev_t dev) {
ggml_metal_device_t ctx_dev = (ggml_metal_device_t)dev->context;
ggml_metal_event_t event = ggml_metal_device_event_init(ctx_dev);
GGML_ASSERT(event);
ggml_backend_event_t ev = new ggml_backend_event {
/* .device = */ dev,
/* .context = */ event,
};
return ev;
}
static void ggml_backend_metal_device_event_free(ggml_backend_dev_t dev, ggml_backend_event_t event) {
ggml_metal_device_t ctx_dev = (ggml_metal_device_t)dev->context;
ggml_metal_event_t ev = (ggml_metal_event_t)event->context;
ggml_metal_device_event_free(ctx_dev, ev);
delete event;
}
static void ggml_backend_metal_device_event_synchronize(ggml_backend_dev_t dev, ggml_backend_event_t event) {
ggml_metal_device_t ctx_dev = (ggml_metal_device_t)dev->context;
ggml_metal_event_t evt = (ggml_metal_event_t)event->context;
ggml_metal_device_event_synchronize(ctx_dev, evt);
}
static ggml_backend_device_i ggml_backend_metal_device_i = {
/* .get_name = */ ggml_backend_metal_device_get_name,
/* .get_description = */ ggml_backend_metal_device_get_description,
/* .get_memory = */ ggml_backend_metal_device_get_memory,
/* .get_type = */ ggml_backend_metal_device_get_type,
/* .get_props = */ ggml_backend_metal_device_get_props,
/* .init_backend = */ ggml_backend_metal_device_init,
/* .init_backend = */ ggml_backend_metal_device_init_backend,
/* .get_buffer_type = */ ggml_backend_metal_device_get_buffer_type,
/* .get_host_buffer_type = */ NULL,
/* .buffer_from_host_ptr = */ ggml_backend_metal_device_buffer_mapped,
/* .supports_op = */ ggml_backend_metal_device_supports_op,
/* .supports_buft = */ ggml_backend_metal_device_supports_buft,
/* .offload_op = */ ggml_backend_metal_device_offload_op,
/* .event_new = */ NULL,
/* .event_free = */ NULL,
/* .event_synchronize = */ NULL,
/* .event_new = */ ggml_backend_metal_device_event_new,
/* .event_free = */ ggml_backend_metal_device_event_free,
/* .event_synchronize = */ ggml_backend_metal_device_event_synchronize,
};
// backend registry
struct ggml_backend_metal_reg {
std::vector<ggml_backend_dev_t> devices;
};
typedef struct ggml_backend_metal_reg * ggml_backend_metal_reg_t;
static ggml_backend_metal_reg_t ggml_backend_metal_reg_init(void) {
ggml_backend_metal_reg_t ctx = new struct ggml_backend_metal_reg;
return ctx;
}
static void ggml_backend_metal_reg_free(ggml_backend_metal_reg_t ctx) {
delete ctx;
}
struct ggml_backend_metal_reg_deleter {
void operator()(ggml_backend_metal_reg_t ctx) {
ggml_backend_metal_reg_free(ctx);
}
};
typedef std::unique_ptr<struct ggml_backend_metal_reg, ggml_backend_metal_reg_deleter> ggml_backend_metal_reg_ptr;
static const char * ggml_backend_metal_reg_get_name(ggml_backend_reg_t reg) {
return "Metal";
return GGML_METAL_NAME;
GGML_UNUSED(reg);
}
static size_t ggml_backend_metal_reg_device_count(ggml_backend_reg_t reg) {
return 1;
GGML_UNUSED(reg);
ggml_backend_metal_reg_t ctx = (ggml_backend_metal_reg_t)reg->context;
return ctx->devices.size();
}
static ggml_backend_dev_t ggml_backend_metal_reg_device_get(ggml_backend_reg_t reg, size_t index) {
GGML_ASSERT(index == 0);
return &g_ggml_metal_device;
GGML_UNUSED(reg);
GGML_UNUSED(index);
ggml_backend_metal_reg_t ctx = (ggml_backend_metal_reg_t)reg->context;
GGML_ASSERT(index < ctx->devices.size());
return ctx->devices[index];
}
static ggml_backend_feature g_ggml_backend_metal_features[] = {
@@ -698,27 +868,67 @@ static void * ggml_backend_metal_get_proc_address(ggml_backend_reg_t reg, const
static ggml_backend_reg_i ggml_backend_metal_reg_i = {
/* .get_name = */ ggml_backend_metal_reg_get_name,
/* .device_count = */ ggml_backend_metal_reg_device_count,
/* .device_get = */ ggml_backend_metal_reg_device_get,
/* .get_device_count = */ ggml_backend_metal_reg_device_count,
/* .get_device = */ ggml_backend_metal_reg_device_get,
/* .get_proc_address = */ ggml_backend_metal_get_proc_address,
};
ggml_backend_reg_t ggml_backend_metal_reg(void) {
{
g_ggml_metal_reg = {
/* .api_version = */ GGML_BACKEND_API_VERSION,
/* .iface = */ ggml_backend_metal_reg_i,
/* .context = */ NULL,
};
static ggml_backend_dev_t ggml_backend_metal_device_init(ggml_backend_reg_t reg, int device) {
return new ggml_backend_device {
/* .iface = */ ggml_backend_metal_device_i,
/* .reg = */ reg,
/* .context = */ ggml_metal_device_get(device),
};
}
g_ggml_metal_device = {
/* .iface = */ ggml_backend_metal_device_i,
/* .reg = */ &g_ggml_metal_reg,
/* .context = */ ggml_metal_device_get(),
};
static void ggml_backend_metal_device_free(ggml_backend_dev_t dev) {
delete dev;
}
struct ggml_backend_device_deleter {
void operator()(ggml_backend_dev_t ctx) {
ggml_backend_metal_device_free(ctx);
}
};
typedef std::unique_ptr<ggml_backend_device, ggml_backend_device_deleter> ggml_backend_device_ptr;
ggml_backend_reg_t ggml_backend_metal_reg(void) {
static ggml_backend_reg reg;
static bool initialized = false;
{
static std::mutex mutex;
std::lock_guard<std::mutex> lock(mutex);
const char * env = getenv("GGML_METAL_DEVICES");
if (env) {
g_devices = atoi(env);
}
static std::vector<ggml_backend_device_ptr> devs;
if (!initialized) {
static ggml_backend_metal_reg_ptr reg_ctx(ggml_backend_metal_reg_init());
for (int i = 0; i < g_devices; ++i) {
auto * dev = ggml_backend_metal_device_init(&reg, i);
devs.emplace_back(dev);
reg_ctx->devices.push_back(dev);
}
reg = {
/* .api_version = */ GGML_BACKEND_API_VERSION,
/* .iface = */ ggml_backend_metal_reg_i,
/* .context = */ reg_ctx.get(),
};
}
initialized = true;
}
return &g_ggml_metal_reg;
return &reg;
}
GGML_BACKEND_DL_IMPL(ggml_backend_metal_reg)