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Merged
merged 3 commits into from
Sep 4, 2024
Merged

rpc : make RPC servers come first in the device list #9296

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0178724
rpc : make RPC servers come first in the device list
rgerganov Aug 30, 2024
7049733
rpc : disable options for non-RPC builds
rgerganov Sep 3, 2024
99cd446
rpc : rpc_count always zero for non-RPC builds
rgerganov Sep 3, 2024
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4 changes: 4 additions & 0 deletions common/common.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1234,11 +1234,13 @@ bool gpt_params_find_arg(int argc, char ** argv, const std::string & arg, gpt_pa
#endif // GGML_USE_CUDA_SYCL_VULKAN
return true;
}
#ifdef GGML_USE_RPC
if (arg == "--rpc") {
CHECK_ARG
params.rpc_servers = argv[i];
return true;
}
#endif
if (arg == "--no-mmap") {
params.use_mmap = false;
return true;
Expand Down Expand Up @@ -1929,7 +1931,9 @@ void gpt_params_print_usage(int /*argc*/, char ** argv, const gpt_params & param
options.push_back({ "*", " --image FILE", "path to an image file. use with multimodal models. Specify multiple times for batching" });

options.push_back({ "backend" });
#ifdef GGML_USE_RPC
options.push_back({ "*", " --rpc SERVERS", "comma separated list of RPC servers" });
#endif

if (llama_supports_mlock()) {
options.push_back({ "*", " --mlock", "force system to keep model in RAM rather than swapping or compressing" });
Expand Down
4 changes: 4 additions & 0 deletions examples/llama-bench/llama-bench.cpp
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Expand Up @@ -299,7 +299,9 @@ static void print_usage(int /* argc */, char ** argv) {
printf(" --cpu-strict <0|1> (default: %s)\n", join(cmd_params_defaults.cpu_strict, ",").c_str());
printf(" --poll <0...100> (default: %s)\n", join(cmd_params_defaults.poll, ",").c_str());
printf(" -ngl, --n-gpu-layers <n> (default: %s)\n", join(cmd_params_defaults.n_gpu_layers, ",").c_str());
#ifdef GGML_USE_RPC
printf(" -rpc, --rpc <rpc_servers> (default: %s)\n", join(cmd_params_defaults.rpc_servers, ",").c_str());
#endif
printf(" -sm, --split-mode <none|layer|row> (default: %s)\n", join(transform_to_str(cmd_params_defaults.split_mode, split_mode_str), ",").c_str());
printf(" -mg, --main-gpu <i> (default: %s)\n", join(cmd_params_defaults.main_gpu, ",").c_str());
printf(" -nkvo, --no-kv-offload <0|1> (default: %s)\n", join(cmd_params_defaults.no_kv_offload, ",").c_str());
Expand Down Expand Up @@ -482,12 +484,14 @@ static cmd_params parse_cmd_params(int argc, char ** argv) {
}
auto p = string_split<int>(argv[i], split_delim);
params.n_gpu_layers.insert(params.n_gpu_layers.end(), p.begin(), p.end());
#ifdef GGML_USE_RPC
} else if (arg == "-rpc" || arg == "--rpc") {
if (++i >= argc) {
invalid_param = true;
break;
}
params.rpc_servers.push_back(argv[i]);
#endif
} else if (arg == "-sm" || arg == "--split-mode") {
if (++i >= argc) {
invalid_param = true;
Expand Down
75 changes: 42 additions & 33 deletions src/llama.cpp
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Expand Up @@ -3346,37 +3346,41 @@ static size_t llama_get_device_count(const llama_model & model) {
static ggml_backend_buffer_type_t llama_default_buffer_type_offload(const llama_model & model, int gpu) {
ggml_backend_buffer_type_t buft = nullptr;

#if defined(GGML_USE_RPC)
int dev_count = (int)llama_get_device_count(model);
#ifdef GGML_USE_RPC
int rpc_count = (int)model.rpc_servers.size();
if (gpu >= dev_count - rpc_count) {
const char * endpoint = model.rpc_servers[gpu - dev_count + rpc_count].c_str();
#else
int rpc_count = 0;
#endif
int local_gpu = gpu - rpc_count;
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I don't think this will work correctly if a list of RPC servers is given in a build without the RPC backend (they should be ignored). The device ids should be from 0 to llama_get_device_count() - 1.

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I think giving a list of RPC servers in non-RPC build should produce an error, i.e. the --rpc command line option must not be available.

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Fixing that in the examples is good, but it still needs to be handled properly for 3rd party applications that use the llama.cpp API directly. llama_model::rpc_servers should probably only exist in builds with the RPC backend.

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I have added ifdefs for the rpc_count. If we want to remove the existence of llama_model::rpc_server, we will need more ifdefs.

#if defined(GGML_USE_RPC)
if (gpu < rpc_count) {
const char * endpoint = model.rpc_servers[gpu].c_str();
return ggml_backend_rpc_buffer_type(endpoint);
}
#endif
#if defined(GGML_USE_METAL)
buft = ggml_backend_metal_buffer_type();
#elif defined(GGML_USE_CUDA)
buft = ggml_backend_cuda_buffer_type(gpu);
buft = ggml_backend_cuda_buffer_type(local_gpu);
#elif defined(GGML_USE_VULKAN)
buft = ggml_backend_vk_buffer_type(gpu);
buft = ggml_backend_vk_buffer_type(local_gpu);
#elif defined(GGML_USE_SYCL)
buft = ggml_backend_sycl_buffer_type(gpu);
buft = ggml_backend_sycl_buffer_type(local_gpu);
#elif defined(GGML_USE_KOMPUTE)
buft = ggml_backend_kompute_buffer_type(gpu);
buft = ggml_backend_kompute_buffer_type(local_gpu);
if (buft == nullptr) {
LLAMA_LOG_WARN("%s: cannot use GPU %d, check `vulkaninfo --summary`\n", __func__, gpu);
LLAMA_LOG_WARN("%s: cannot use GPU %d, check `vulkaninfo --summary`\n", __func__, local_gpu);
}
#elif defined(GGML_USE_CANN)
buft = ggml_backend_cann_buffer_type(gpu);
buft = ggml_backend_cann_buffer_type(local_gpu);
#endif

if (buft == nullptr) {
buft = llama_default_buffer_type_cpu(true);
}
return buft;
GGML_UNUSED(model);
GGML_UNUSED(gpu);
GGML_UNUSED(local_gpu);
}

static ggml_backend_buffer_type_t llama_default_buffer_type_split(const llama_model & model, int fallback_gpu, const float * tensor_split) {
Expand All @@ -3403,42 +3407,46 @@ static ggml_backend_buffer_type_t llama_default_buffer_type_split(const llama_mo
}

static size_t llama_get_device_memory(const llama_model & model, int device) {
#if defined(GGML_USE_RPC)
int dev_count = (int)llama_get_device_count(model);
#ifdef GGML_USE_RPC
int rpc_count = (int)model.rpc_servers.size();
if (device >= dev_count - rpc_count) {
#else
int rpc_count = 0;
#endif
int local_device = device - rpc_count;
#if defined(GGML_USE_RPC)
if (device < rpc_count) {
size_t total;
size_t free;
const char * endpoint = model.rpc_servers[device - dev_count + rpc_count].c_str();
const char * endpoint = model.rpc_servers[device].c_str();
ggml_backend_rpc_get_device_memory(endpoint, &free, &total);
return free;
}
#endif
#if defined(GGML_USE_CUDA)
size_t total;
size_t free;
ggml_backend_cuda_get_device_memory(device, &free, &total);
ggml_backend_cuda_get_device_memory(local_device, &free, &total);
return free;
#elif defined(GGML_USE_SYCL)
size_t total;
size_t free;
ggml_backend_sycl_get_device_memory(device, &free, &total);
ggml_backend_sycl_get_device_memory(local_device, &free, &total);
return free;
#elif defined(GGML_USE_VULKAN)
size_t total;
size_t free;
ggml_backend_vk_get_device_memory(device, &free, &total);
ggml_backend_vk_get_device_memory(local_device, &free, &total);
return free;
#elif defined(GGML_USE_CANN)
size_t total;
size_t free;
ggml_backend_cann_get_device_memory(device, &free, &total);
ggml_backend_cann_get_device_memory(local_device, &free, &total);
return free;
#else
return 1;
#endif
GGML_UNUSED(model);
GGML_UNUSED(device);
GGML_UNUSED(local_device);
}

//
Expand Down Expand Up @@ -18186,6 +18194,20 @@ struct llama_context * llama_new_context_with_model(

if (!hparams.vocab_only) {
// initialize backends
#if defined(GGML_USE_RPC)
if (model->n_gpu_layers > 0) {
for (const auto & endpoint : model->rpc_servers) {
ggml_backend_t backend = ggml_backend_rpc_init(endpoint.c_str());
if (backend == nullptr) {
LLAMA_LOG_ERROR("%s: failed to initialize RPC to '%s'\n", __func__, endpoint.c_str());
llama_free(ctx);
return nullptr;
}
ctx->backends.push_back(backend);
}
}
#endif

#if defined(GGML_USE_METAL)
if (model->n_gpu_layers > 0) {
ctx->backend_metal = ggml_backend_metal_init();
Expand Down Expand Up @@ -18310,19 +18332,6 @@ struct llama_context * llama_new_context_with_model(
}
#endif

#if defined(GGML_USE_RPC)
if (model->n_gpu_layers > 0) {
for (const auto & endpoint : model->rpc_servers) {
ggml_backend_t backend = ggml_backend_rpc_init(endpoint.c_str());
if (backend == nullptr) {
LLAMA_LOG_ERROR("%s: failed to initialize RPC to '%s'\n", __func__, endpoint.c_str());
llama_free(ctx);
return nullptr;
}
ctx->backends.push_back(backend);
}
}
#endif
ctx->backend_cpu = ggml_backend_cpu_init();
if (ctx->backend_cpu == nullptr) {
LLAMA_LOG_ERROR("%s: failed to initialize CPU backend\n", __func__);
Expand Down
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