thread-pool | Thread pool implementation using c++11 threads | Crawler library
kandi X-RAY | thread-pool Summary
kandi X-RAY | thread-pool Summary
The way that I understand things better is with images. So, let's take a look at the image of thread pool given by Wikipedia:.
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thread-pool Key Features
thread-pool Examples and Code Snippets
Lines of Code : 14
License : No License
Copypublic static int multiprocessorSystem(int[] ability, int num, int processes) {
PriorityQueue pq = new PriorityQueue<>((p1, p2) -> Integer.compare(p2, p1));
for (int cap : ability) {
pq.add(cap);
}
def shutdown(self):
"""Shuts down the worker pool."""
for conn in self._conn.values():
conn.close()
self._conn = {}
if self._runner is not None:
try:
self._runner.join()
except Exception as e: # pylint: disa @Bean
public TaskExecutor taskExecutor() {
ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
taskExecutor.setCorePoolSize(2);
taskExecutor.setMaxPoolSize(2);
taskExecutor.setWaitForTasksToComplete Community Discussions
Trending Discussions on thread-pool
QUESTION
this is my first post, I hope don't be a mess.
I'm getting the following error when I tried to deploy and ear app:
...ANSWER
Answered 2022-Jan-19 at 15:13I solved the problem removing this property on domain.xml:
QUESTION
This error trace is polluting my logs and I can't find on SA or else what is causing it:
...ANSWER
Answered 2022-Jan-15 at 18:05Looks like Grizzly is trying to obtain the hostname from the Host header in the request. Since HTTP 1.1 the Host header is required but if the Host header is set an empty name, Grizzly cannot obtain the name and throws an exception.
The Host request header is set by the HTTP client. But even if the Host header exists but its value is empty due to some reason the exception will be thrown.
Grizzly Code: the code that throws the Exception
According to the Javadocs for Grizzly you can set the default hostname by calling the setDefaultHostName(String defaultHostName) method, but the instance of the Mapper in the HttpHanderChain instance is not exposed. The default value set in HttpHanderChain of the Mapper instance is set to "localhost".
QUESTION
I have asked a simpler version of this question before and got the correct answer: Thread pools not working with large number of tasks Now I am trying to run tasks from an object of a class in parallel using a thread pool. My task is simple and only prints a number for that instance of class. I am expecting numbers 0->9 get printed but instead I get some numbers get printed more than once and some numbers not printed at all. Can anyone see what I am doing wrong with creating tasks in my loop?
...ANSWER
Answered 2021-Dec-16 at 22:13There's too much code to analyse all of it but you take a pointer by reference here:
QUESTION
I'm in the process of trying to figure out multithreading - I'm pretty new to it. I'm using a thread_pool type that I found here. For sufficiently large N, the following code segfaults. Could you guys help me understand why and how to fix?
ANSWER
Answered 2021-Dec-09 at 17:29Destructors are called in the order opposite to variable declaration order. i.e. v will be destructed earlier than pool, therefore at the moment when some threads from pool will call to printString(), the argument string will not be a valid object, because v and its content are already destroyed. To resolve this, I'd recommend to declare v before pool.
QUESTION
if i have one (or more) CompletableFuture not started yet, and on that method(s) a few thenApplyAsync(), anyOf()-methods.
Will the Garbage Collector remove all of that?
If there is a join()/get() at the end of that chain -> same question: Will the Garbage Collector remove all of that?
Maybe we need more information about that context of the join().
That join is in a Thread the last command, and there are no side-effects. So is in that case the Thread still active? - Java Thread Garbage collected or not
Anyway is that a good idea, to push a poisen-pill down the chain, if im sure (maybe in a try-catch-finally), that i will not start that Completable-chain, or is that not necessary?
The question is because of something like that? (https://bugs.openjdk.java.net/browse/JDK-8160402)
Some related question to it: When is the Thread-Executor signaled to shedule a new task? I think, when the CompletableFuture goes to the next chained CompletableFuture?. So i must only carry on memory-leaks and not thread-leaks?
Edit: What i mean with a not started CompletableFuture?
i mean a var I can start the notStartedCompletableFuture in that way:
Edit 2: A more detailed Example:notStartedCompletableFuture = new CompletableFuture(); instead of a CompletableFuture.supplyAsync(....);
notStartedCompletableFuture.complete(new Object); later in the program-flow or from another thread.
ANSWER
Answered 2021-Nov-20 at 23:48If a thread calls join() or get() on a CompletableFuture that will never be completed, it will remain blocked forever (except if it gets interrupted), holding a reference to that future.
If that future is the root of a chain of descendant futures (+ tasks and executors), it will also keep a reference to those, which will also remain in memory (as well as all transitively referenced objects).
A future does not normally hold references to its “parent(s)” when created through the then*() methods, so they should normally be garbage collected if there are no other references – but pay attention to those, e.g. local variables in the calling thread, reference to a List> used in a lambda after allOf() etc.
QUESTION
ANSWER
Answered 2021-Oct-15 at 14:33A decrease in performance is expected when paging. This is because messages are being paged to and from disk instead of being accessed directly from RAM. Even the fastest disks are much slower than RAM therefore paging reduces performance.
There are a few ways to mitigate this performance decrease:
- Provide the broker's JVM with enough heap space so that paging never occurs.
- Use flow-control to prevent the excessive build-up of messages on the broker that leads to paging.
- Ensure that message consumption keeps up with message production to prevent the excessive build-up of messages on the broker that leads to paging (e.g. add more consumers, increase performance of existing consumers, etc.).
- Use high-speed SSDs instead of slower traditional HDDs.
My guess is that you're using mostly non-durable messages so that restarting the broker clears out these messages and eliminates the need to page thus restoring normal performance.
Also, since your using ActiveMQ Artemis 2.7.0 I strongly recommend you upgrade to the latest release. It's been over 2 years now since 2.7.0 was released and there have been many bug fixes and new features implemented in later versions.
QUESTION
I'm using io.github.resilience4j. Everything is working fine with 1.6.1 version but when upgraded to 1.7.1 version my application is not running. Please find my code changes below.
My pom.xml dependencies
...ANSWER
Answered 2021-Oct-09 at 10:24Try version 1.7.0
QUESTION
I use this library for creating a queued pool of pthread. The thread is decided by the OS, but we know that we always have 4 jobs (in the below case) running simultaneously as long as the queue is full.
If each job uses one source from 4 available sources, I want to guarantee that all 4 sources are used at the same time. Avoiding a source to be used twice while another is not used in a time.
I came with this idea to use an array keeping track of used sources
...ANSWER
Answered 2021-Jul-11 at 02:22It seems to me like you are re-inventing the wheel, and unfortunately in the wrong way. The POSIX threads API already has the feature you're looking for: mutexes. Simply define 4 mutexes and use those for locking/unlocking a resource.
QUESTION
I've been trying to make a simple implementation of Thread-Pool using Active Objects.
Here is my Main:
...ANSWER
Answered 2021-Jun-30 at 02:31In your main method you create a thread pool (which also creates and starts tp.t thread), enqueue a task into tp.q, and then call tp.shutDown():
QUESTION
I am trying to get the Play Framework to connect to Postgres database over SSL. SSL is configured with LetsEncrypt on Postgres.
Without SSL, Play has no problem connecting to the database. But with it, I get the error:
...ANSWER
Answered 2021-May-19 at 07:05You probably want to set the sslrootcert variable of the PostgreSQL JDBC driver in order to change the location of the certificate. I quote from the driver's manual:
sslrootcert = String
File name of the SSL root certificate. Defaults to defaultdir/root.crt where defaultdir is ${user.home}/.postgresql/ in *nix systems and %appdata%/postgresql/ on windows
It can be a PEM encoded X509v3 certificate
See, for example, https://jdbc.postgresql.org/documentation/head/connect.html. And while I haven't tried it, you should be able to add it as a further argument to your JDBC connection string, db.default.url, like
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