Return a list of all Thread objects currently active. The listincludes daemonic threads and dummy thread objects created bycurrent_thread(). It excludes terminated threads and threadsthat have not yet been started. However, the main thread is always partof the result, even when terminated.
Return the thread stack size used when creating new threads. The optionalsize argument specifies the stack size to be used for subsequently createdthreads, and must be 0 (use platform or configured default) or a positiveinteger value of at least 32,768 (32 KiB). If size is not specified,0 is used. If changing the thread stack size isunsupported, a RuntimeError is raised. If the specified stack size isinvalid, a ValueError is raised and the stack size is unmodified. 32 KiBis currently the minimum supported stack size value to guarantee sufficientstack space for the interpreter itself. Note that some platforms may haveparticular restrictions on values for the stack size, such as requiring aminimum stack size > 32 KiB or requiring allocation in multiples of the systemmemory page size - platform documentation should be referred to for moreinformation (4 KiB pages are common; using multiples of 4096 for the stack size isthe suggested approach in the absence of more specific information).
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Daemon threads are abruptly stopped at shutdown. Their resources (suchas open files, database transactions, etc.) may not be released properly.If you want your threads to stop gracefully, make them non-daemonic anduse a suitable signalling mechanism such as an Event.
The Thread ID (TID) of this thread, as assigned by the OS (kernel).This is a non-negative integer, or None if the thread has notbeen started. See the get_native_id() function.This value may be used to uniquely identify this particular threadsystem-wide (until the thread terminates, after which the valuemay be recycled by the OS).
A boolean value indicating whether this thread is a daemon thread (True)or not (False). This must be set before start() is called,otherwise RuntimeError is raised. Its initial value is inheritedfrom the creating thread; the main thread is not a daemon thread andtherefore all threads created in the main thread default todaemon = False.
When more than one thread is blocked in acquire() waiting for thestate to turn to unlocked, only one thread proceeds when a release()call resets the state to unlocked; which one of the waiting threads proceedsis not defined, and may vary across implementations.
Release a lock, decrementing the recursion level. If after the decrement it iszero, reset the lock to unlocked (not owned by any thread), and if any otherthreads are blocked waiting for the lock to become unlocked, allow exactly oneof them to proceed. If after the decrement the recursion level is stillnonzero, the lock remains locked and owned by the calling thread.
The typical programming style using condition variables uses the lock tosynchronize access to some shared state; threads that are interested in aparticular change of state call wait() repeatedly until theysee the desired state, while threads that modify the state callnotify() or notify_all() when they changethe state in such a way that it could possibly be a desired state for oneof the waiters. For example, the following code is a genericproducer-consumer situation with unlimited buffer capacity:
To choose between notify() and notify_all(),consider whether one state change can be interesting for only one or severalwaiting threads. E.g. in a typical producer-consumer situation, adding oneitem to the buffer only needs to wake up one consumer thread.
Wake up all threads waiting on this condition. This method acts likenotify(), but wakes up all waiting threads instead of one. If thecalling thread has not acquired the lock when this method is called, aRuntimeError is raised.
If the internal counter is zero on entry, block until awoken by a call torelease(). Once awoken (and the counter is greaterthan 0), decrement the counter by 1 and return True. Exactly onethread will be awoken by each call to release(). Theorder in which threads are awoken should not be relied on.
Semaphores are often used to guard resources with limited capacity, for example,a database server. In any situation where the size of the resource is fixed,you should use a bounded semaphore. Before spawning any worker threads, yourmain thread would initialize the semaphore:
Timers are started, as with threads, by calling their Timer.startmethod. The timer can be stopped (before its action has begun) by calling thecancel() method. The interval the timer will wait beforeexecuting its action may not be exactly the same as the interval specified bythe user.
This class provides a simple synchronization primitive for use by a fixed numberof threads that need to wait for each other. Each of the threads tries to passthe barrier by calling the wait() method and will block untilall of the threads have made their wait() calls. At this point,the threads are released simultaneously.
Create a barrier object for parties number of threads. An action, whenprovided, is a callable to be called by one of the threads when they arereleased. timeout is the default timeout value if none is specified forthe wait() method.
Pass the barrier. When all the threads party to the barrier have calledthis function, they are all released simultaneously. If a timeout isprovided, it is used in preference to any that was supplied to the classconstructor.
Put the barrier into a broken state. This causes any active or futurecalls to wait() to fail with the BrokenBarrierError. Usethis for example if one of the threads needs to abort, to avoid deadlocking theapplication.
Hi. If you have 2 socket Haswell each with 18 physical cores and multithreading, you should be able to use 72 threads. It does not always mean that it is optimal. AFAIK, there are cases when it is better to use only physical cores. I have never had any problems with correct detection of logical cores and I am usually using two socket systems, however on Haswell I have been using machines with only 1 socket, so no direct experience for this particular processors.
Hi, thanks! Pluto looks and works great, sometimes giving a machine a real spin. Hope all is working correctly and you are getting full utilization. Sorry, I am not able to precisely answer your question about how Julia detects the maximum number of threads available. Not even sure if it varies between Julia versions. Again, I personally did not have any problems with it, however, I know that some concerns regarding the correct detection were raised by very knowledgeable persons in GitHub posts I was reading. Never investigated it deeply. If there were problems with auto detection even if starting Julia with -t 72 flag when running some intensive computations I would double check in top to be sure all is fine (all cores utilized). BTW, I can hardly believe that with emacs you are an absolute beginner. Once again, have fun and hope to stay in touch.
If your question is simply how to find out how many physical and virtual cores a machine has, then the answer is that there are many ways. You could, for example, use Hwloc.jl. Example on my 6-core machine (12 hardware threads with hyperthreading):
Side comment for the curious: To answer your question in the title of this thread, i.e. how Julia detects the max number of threads when it is started with julia -t auto. I guess the relevant bit is and below.
2022-04-01 18:07:06,022 INFO [io.qua.dep.dev.IsolatedDevModeMain] (main) Attempting to start live reload endpoint to recover from previous Quarkus startup failure2022-04-01 18:07:07,444 INFO [org.jbo.threads] (main) JBoss Threads version 2.3.3.Final2022-04-01 18:07:07,451 ERROR [io.qua.dep.dev.DevModeMain] (main) Quarkus dev mode failed to start: java.lang.NoSuchMethodError: org.jboss.threads.JBossExecutors.rejectingExecutor()Ljava/util/concurrent/Executor;at io.quarkus.vertx.core.runtime.QuarkusExecutorFactory.internalCreateExecutor(QuarkusExecutorFactory.java:48)at io.quarkus.vertx.core.runtime.QuarkusExecutorFactory.createExecutor(QuarkusExecutorFactory.java:42)at io.vertx.core.impl.VertxImpl.(VertxImpl.java:161)at io.vertx.core.impl.VertxBuilder.vertx(VertxBuilder.java:225)at io.quarkus.vertx.core.runtime.VertxCoreRecorder.initialize(VertxCoreRecorder.java:236)at io.quarkus.vertx.core.runtime.VertxCoreRecorder$VertxSupplier.get(VertxCoreRecorder.java:577)at io.quarkus.vertx.core.runtime.VertxCoreRecorder$VertxSupplier.get(VertxCoreRecorder.java:559)at io.quarkus.vertx.http.runtime.VertxHttpRecorder.startServerAfterFailedStart(VertxHttpRecorder.java:208)at io.quarkus.vertx.http.runtime.devmode.VertxHttpHotReplacementSetup.handleFailedInitialStart(VertxHttpHotReplacementSetup.java:61)at io.quarkus.deployment.dev.RuntimeUpdatesProcessor.startupFailed(RuntimeUpdatesProcessor.java:1145)at io.quarkus.deployment.dev.IsolatedDevModeMain.firstStart(IsolatedDevModeMain.java:168)at io.quarkus.deployment.dev.IsolatedDevModeMain.accept(IsolatedDevModeMain.java:455)at io.quarkus.deployment.dev.IsolatedDevModeMain.accept(IsolatedDevModeMain.java:66)at io.quarkus.bootstrap.app.CuratedApplication.runInCl(CuratedApplication.java:140)at io.quarkus.bootstrap.app.CuratedApplication.runInAugmentClassLoader(CuratedApplication.java:96)at io.quarkus.deployment.dev.DevModeMain.start(DevModeMain.java:132)at io.quarkus.deployment.dev.DevModeMain.main(DevModeMain.java:62)Exception in thread "main" java.lang.RuntimeException: java.lang.NoSuchMethodError: org.jboss.threads.JBossExecutors.rejectingExecutor()Ljava/util/concurrent/Executor;at io.quarkus.deployment.dev.DevModeMain.start(DevModeMain.java:138)at io.quarkus.deployment.dev.DevModeMain.main(DevModeMain.java:62)Caused by: java.lang.NoSuchMethodError: org.jboss.threads.JBossExecutors.rejectingExecutor()Ljava/util/concurrent/Executor;at io.quarkus.vertx.core.runtime.QuarkusExecutorFactory.internalCreateExecutor(QuarkusExecutorFactory.java:48)at io.quarkus.vertx.core.runtime.QuarkusExecutorFactory.createExecutor(QuarkusExecutorFactory.java:42)at io.vertx.core.impl.VertxImpl.(VertxImpl.java:161)at io.vertx.core.impl.VertxBuilder.vertx(VertxBuilder.java:225)at io.quarkus.vertx.core.runtime.VertxCoreRecorder.initialize(VertxCoreRecorder.java:236)at io.quarkus.vertx.core.runtime.VertxCoreRecorder$VertxSupplier.get(VertxCoreRecorder.java:577)at io.quarkus.vertx.core.runtime.VertxCoreRecorder$VertxSupplier.get(VertxCoreRecorder.java:559)at io.quarkus.vertx.http.runtime.VertxHttpRecorder.startServerAfterFailedStart(VertxHttpRecorder.java:208)at io.quarkus.vertx.http.runtime.devmode.VertxHttpHotReplacementSetup.handleFailedInitialStart(VertxHttpHotReplacementSetup.java:61)at io.quarkus.deployment.dev.RuntimeUpdatesProcessor.startupFailed(RuntimeUpdatesProcessor.java:1145)at io.quarkus.deployment.dev.IsolatedDevModeMain.firstStart(IsolatedDevModeMain.java:168)at io.quarkus.deployment.dev.IsolatedDevModeMain.accept(IsolatedDevModeMain.java:455)at io.quarkus.deployment.dev.IsolatedDevModeMain.accept(IsolatedDevModeMain.java:66)at io.quarkus.bootstrap.app.CuratedApplication.runInCl(CuratedApplication.java:140)at io.quarkus.bootstrap.app.CuratedApplication.runInAugmentClassLoader(CuratedApplication.java:96)at io.quarkus.deployment.dev.DevModeMain.start(DevModeMain.java:132)... 1 more 006ab0faaa
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