Spawn workers on demand
parent
40f66f3333
commit
bc0189ffa1
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@ -30,6 +30,7 @@ use melib::async_workers::{Work, WorkContext};
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use melib::datetime::{self, UnixTimestamp};
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use melib::text_processing::Truncate;
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use std::collections::HashMap;
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use std::sync::atomic::{AtomicUsize, Ordering};
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use std::sync::Arc;
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use std::sync::Mutex;
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use std::thread;
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@ -174,6 +175,8 @@ impl WorkController {
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};
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let queue: WorkQueue = WorkQueue::new(new_jobs_tx, work_context.clone());
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let active_threads = Arc::new(AtomicUsize::new(MAX_WORKER));
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// Create a SyncFlag to share whether or not there are more jobs to be done.
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let (thread_end_tx, thread_end_rx) = bounded(1);
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@ -185,13 +188,14 @@ impl WorkController {
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let mut threads = threads_lock.lock().unwrap();
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/* spawn worker threads */
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for thread_num in 0..MAX_WORKER {
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for _ in 0..MAX_WORKER {
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/* Each worker thread will wait on two channels: thread_end and new_jobs. thread_end
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* informs the worker that it should quit and new_jobs informs that there is a new job
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* available inside the queue. Only one worker will get each job, and others will
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* go back to waiting on the channels */
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let thread_queue = queue.clone();
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let active_threads = active_threads.clone();
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let thread_end_rx = thread_end_rx.clone();
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let new_jobs_rx = new_jobs_rx.clone();
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let new_jobs_rx = new_jobs_rx.clone();
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@ -199,37 +203,14 @@ impl WorkController {
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let work_context = work_context.clone();
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let pulse = pulse.clone();
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let handle = thread::spawn(move || {
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let mut work_done = 0;
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'work_loop: loop {
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debug!("Waiting for work");
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select! {
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recv(thread_end_rx) -> _ => {
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debug!("received thread_end_rx, quitting");
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break 'work_loop;
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},
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recv(new_jobs_rx) -> _ => {
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while let Some(work) = thread_queue.get_work() {
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debug!("Got some work");
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work.compute(work_context.clone());
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debug!("finished work");
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work_done += 1;
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work_context.set_name.send((std::thread::current().id(), "idle-worker".to_string())).unwrap();
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work_context.set_status.send((std::thread::current().id(), "inactive".to_string())).unwrap();
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pulse.send(ThreadEvent::Pulse).unwrap();
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std::thread::yield_now();
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}
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continue 'work_loop;
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},
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}
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}
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/* report the amount of work done. */
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debug!("Thread {} did {} jobs.", thread_num, work_done);
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});
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let handle = spawn_worker(
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thread_queue,
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active_threads,
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thread_end_rx,
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new_jobs_rx,
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work_context,
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pulse,
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);
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/* add the handle for the newly spawned thread to the list of handles */
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threads.insert(handle.thread().id(), String::from("idle-worker").into());
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@ -242,7 +223,6 @@ impl WorkController {
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let threads_lock = threads_lock.clone();
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let _static_threads_lock = static_threads_lock.clone();
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let thread_queue = queue.clone();
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let threads_lock = threads_lock.clone();
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let thread_end_rx = thread_end_rx.clone();
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let work_context = work_context.clone();
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@ -259,6 +239,19 @@ impl WorkController {
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let handle = thread::spawn(move || work.compute(work_context));
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_static_threads_lock.lock().unwrap().insert(handle.thread().id(), String::new().into());
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} else {
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if active_threads.load(Ordering::SeqCst) == 0 {
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let handle = spawn_worker(
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thread_queue.clone(),
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active_threads.clone(),
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thread_end_rx.clone(),
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new_jobs_rx.clone(),
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work_context.clone(),
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pulse.clone(),
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);
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/* add the handle for the newly spawned thread to the list of handles */
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threads_lock.lock().unwrap().insert(handle.thread().id(), String::from("idle-worker").into());
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}
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thread_queue.add_work(work);
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}
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}
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@ -356,3 +349,37 @@ impl WorkController {
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self.work_context.clone()
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}
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}
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fn spawn_worker(
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thread_queue: WorkQueue,
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active_threads: Arc<AtomicUsize>,
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thread_end_rx: crossbeam::Receiver<bool>,
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new_jobs_rx: crossbeam::Receiver<bool>,
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work_context: WorkContext,
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pulse: crossbeam::Sender<ThreadEvent>,
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) -> std::thread::JoinHandle<()> {
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thread::spawn(move || 'work_loop: loop {
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debug!("Waiting for work");
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select! {
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recv(thread_end_rx) -> _ => {
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debug!("received thread_end_rx, quitting");
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active_threads.fetch_sub(1, Ordering::SeqCst);
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break 'work_loop;
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},
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recv(new_jobs_rx) -> _ => {
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active_threads.fetch_sub(1, Ordering::SeqCst);
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while let Some(work) = thread_queue.get_work() {
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debug!("Got some work");
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work.compute(work_context.clone());
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debug!("finished work");
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work_context.set_name.send((std::thread::current().id(), "idle-worker".to_string())).unwrap();
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work_context.set_status.send((std::thread::current().id(), "inactive".to_string())).unwrap();
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pulse.send(ThreadEvent::Pulse).unwrap();
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std::thread::yield_now();
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}
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active_threads.fetch_add(1, Ordering::SeqCst);
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},
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}
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})
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}
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