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server : graceful server shutdown (#5244)

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This updates the server queue to support graceful shutdown of the server on signals.
This commit is contained in:
Daniel Hiltgen 2024-02-18 08:23:16 -08:00 committed by GitHub
parent 1dcc3fde00
commit 66c1968f7a
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2 changed files with 39 additions and 4 deletions
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23
examples/server/server.cpp
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@ -28,6 +28,7 @@
#include <chrono>
#include <condition_variable>
#include <atomic>
#include <signal.h>
using json = nlohmann::json;
@ -2511,6 +2512,9 @@ static void append_to_generated_text_from_generated_token_probs(llama_server_con
}
}
std::function<void(int)> shutdown_handler;
inline void signal_handler(int signal) { shutdown_handler(signal); }
int main(int argc, char **argv)
{
#if SERVER_VERBOSE != 1
@ -3128,8 +3132,25 @@ int main(int argc, char **argv)
std::placeholders::_2,
std::placeholders::_3
));
llama.queue_tasks.start_loop();
shutdown_handler = [&](int) {
llama.queue_tasks.terminate();
};
#if defined (__unix__) || (defined (__APPLE__) && defined (__MACH__))
struct sigaction sigint_action;
sigint_action.sa_handler = signal_handler;
sigemptyset (&sigint_action.sa_mask);
sigint_action.sa_flags = 0;
sigaction(SIGINT, &sigint_action, NULL);
#elif defined (_WIN32)
auto console_ctrl_handler = +[](DWORD ctrl_type) -> BOOL {
return (ctrl_type == CTRL_C_EVENT) ? (signal_handler(SIGINT), true) : false;
};
SetConsoleCtrlHandler(reinterpret_cast<PHANDLER_ROUTINE>(console_ctrl_handler), true);
#endif
llama.queue_tasks.start_loop();
svr.stop();
t.join();
llama_backend_free();

20
examples/server/utils.hpp
View File

@ -220,6 +220,7 @@ inline std::string format_chatml(std::vector<json> messages)
struct llama_server_queue {
int id = 0;
std::mutex mutex_tasks;
bool running;
// queues
std::vector<task_server> queue_tasks;
std::vector<task_server> queue_tasks_deferred;
@ -278,9 +279,18 @@ struct llama_server_queue {
queue_tasks_deferred.clear();
}
// Start the main loop. This call is blocking
[[noreturn]]
// end the start_loop routine
void terminate() {
{
std::unique_lock<std::mutex> lock(mutex_tasks);
running = false;
}
condition_tasks.notify_all();
}
// Start the main loop.
void start_loop() {
running = true;
while (true) {
// new task arrived
LOG_VERBOSE("have new task", {});
@ -324,8 +334,12 @@ struct llama_server_queue {
{
std::unique_lock<std::mutex> lock(mutex_tasks);
if (queue_tasks.empty()) {
if (!running) {
LOG_VERBOSE("ending start_loop", {});
return;
}
condition_tasks.wait(lock, [&]{
return !queue_tasks.empty();
return (!queue_tasks.empty() || !running);
});
}
}