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metal : parallel command buffer encoding (#1860)

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* metal : parallel command buffer encoding

* metal : determine number of command buffers based on gf->n_threads
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Georgi Gerganov 2023-06-15 20:29:48 +03:00 committed by GitHub
parent 6b8312e797
commit 4bfcc855ab
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 471 additions and 447 deletions
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1
ggml-metal.h
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@ -55,6 +55,7 @@ void ggml_metal_set_tensor(struct ggml_metal_context * ctx, struct ggml_tensor *
void ggml_metal_get_tensor(struct ggml_metal_context * ctx, struct ggml_tensor * t);
// same as ggml_graph_compute but uses Metal
// creates gf->n_threads command buffers in parallel
void ggml_metal_graph_compute(struct ggml_metal_context * ctx, struct ggml_cgraph * gf);
#ifdef __cplusplus

45
ggml-metal.m
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@ -287,15 +287,40 @@ void ggml_metal_graph_compute(
struct ggml_cgraph * gf) {
metal_printf("%s: evaluating graph\n", __func__);
// create multiple command buffers and enqueue them
// then, we encode the graph into the command buffers in parallel
const int n_cb = gf->n_threads;
NSMutableArray * command_buffers = [NSMutableArray arrayWithCapacity:n_cb];
for (int i = 0; i < n_cb; ++i) {
command_buffers[i] = [ctx->queue commandBuffer];
// enqueue the command buffers in order to specify their execution order
[command_buffers[i] enqueue];
}
// TODO: is this the best way to start threads?
dispatch_queue_t queue = dispatch_queue_create("llama.cpp", DISPATCH_QUEUE_CONCURRENT);
for (int cb_idx = 0; cb_idx < n_cb; ++cb_idx) {
const int n_nodes_per_cb = (gf->n_nodes + n_cb - 1) / n_cb;
dispatch_async(queue, ^{
size_t offs_src0 = 0;
size_t offs_src1 = 0;
size_t offs_dst = 0;
id<MTLCommandBuffer> command_buffer = [ctx->queue commandBuffer];
id<MTLCommandBuffer> command_buffer = command_buffers[cb_idx];
id<MTLComputeCommandEncoder> encoder = nil;
for (int i = 0; i < gf->n_nodes; ++i) {
//metal_printf("%s: encoding node %3d, op = %8s\n", __func__, i, ggml_op_name(gf->nodes[i]->op));
const int node_start = (cb_idx + 0) * n_nodes_per_cb;
const int node_end = (cb_idx == n_cb - 1) ? gf->n_nodes : (cb_idx + 1) * n_nodes_per_cb;
for (int i = node_start; i < node_end; ++i) {
metal_printf("%s: encoding node %3d, op = %8s\n", __func__, i, ggml_op_name(gf->nodes[i]->op));
struct ggml_tensor * src0 = gf->nodes[i]->src0;
struct ggml_tensor * src1 = gf->nodes[i]->src1;
@ -626,7 +651,6 @@ void ggml_metal_graph_compute(
}
};
[encoder setBuffer:id_src0 offset:offs_src0 atIndex:0];
[encoder setBuffer:id_src1 offset:offs_src1 atIndex:1];
[encoder setBuffer:id_dst offset:offs_dst atIndex:2];
@ -800,12 +824,11 @@ void ggml_metal_graph_compute(
}
[command_buffer commit];
[command_buffer waitUntilCompleted];
{
const double time_elapsed = [command_buffer GPUEndTime] - [command_buffer GPUStartTime];
UNUSED(time_elapsed);
metal_printf("%s: time elapsed = %f ms\n", __func__, time_elapsed * 1000.0);
});
}
// wait for all threads to finish
dispatch_barrier_sync(queue, ^{});
[command_buffers[n_cb - 1] waitUntilCompleted];
}