Recent questions tagged concurrency

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concurrency - Clojure agents consuming from a queue

I'm trying to figure out the best way to use agents to consume items from a Message Queue (Amazon SQS). Right now ... )) (recur (inc count))))) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - Python: Wait on all of `concurrent.futures.ThreadPoolExecutor`'s futures

I've given concurrent.futures.ThreadPoolExecutor a bunch of tasks, and I want to wait until they're all completed ... action on the executor.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - Using a semaphore inside a nested Java 8 parallel stream action may DEADLOCK. Is this a bug?

Consider the following situation: We are using a Java 8 parallel stream to perform a parallel forEach loop, e.g., IntStream. ... ) { } }); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - Iterate over lines in a file in parallel (Scala)?

I know about the parallel collections in Scala. They are handy! However, I would like to iterate over the ... and handle them in parallel. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - Best way to implement global counters for highly concurrent applications?

What is the best way to implement global counters for a highly concurrent application? In my case I may have ... faster... Further thoughts? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - Explain "Leader/Follower" Pattern

I can't seem to find a good and accessible explanation of "Leader/Follower" pattern. All explanations are ... to diagrams are appreciated too. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - How are you taking advantage of Multicore?

As someone in the world of HPC who came from the world of enterprise web development, I'm always ... remaining cores for your application? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - How/why do functional languages (specifically Erlang) scale well?

I have been watching the growing visibility of functional programming languages and features for a while. I looked ... safe, yet still scale? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - How do you process messages in parallel while ensuring FIFO per entity?

Let's say you have an entity, say, "Person" in your system and you want to process events that modify various ... I'm not considering? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - How to Prevent Sql Server Jobs to Run simultaneously

I have some scheduled jobs in my SQL Agent: Job1, executing every 2 minutes Job2, executing every 10 ... in their appropriate period. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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679 views

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concurrency - bash flock: exit if can't acquire lock

The following lock mechanism is used for preventing a cron job from running concurrently: #!/bin/bash echo " ... tried -n without success. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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575 views

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concurrency - Question About Deadlock Situation in Java

I'm learning about deadlocks in Java, and there's this sample code from Sun's official tutorial: Alphonse and ... me a easy explanation, thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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389 views

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concurrency - Python sock.listen(...)

All the examples I've seen of sock.listen(5) in the python documentation suggest I should set the max backlog number to ... .log("ERR %s" % e) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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concurrency - Is MySQL Temporary table a shared resource?

I have a MySQL stored procedure that uses a temporary table. Assume that my table name is 'temp' and I use ... different calls to the same SP? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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632 views

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concurrency - Javascript semaphore / test-and-set / lock?

Is there such a thing as an atomic test-and-set, semaphore, or lock in Javascript? I have javascript invoking ... ("something") . Any ideas? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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435 views

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concurrency - What happens if two threads read & write the same piece of memory

It's my understanding that if two threads are reading from the same piece of memory, and no thread is writing ... read thread has stale data. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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552 views

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concurrency - ConcurrentHashMap, which concurrent features improved in JDK8

Can any concurrent expert explain in ConcurrentHashMap, which concurrent features improved comparing with which in previous JDKs See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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529 views

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concurrency - Java long running task Thread interrupt vs cancel flag

I have a long running task, something like: public void myCancellableTask() { while ( someCondition ) { ... , thoughts? thanks, Jeff See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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410 views

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concurrency - How to implement event listening in PHP

here is my problem: I have a script (let's call it comet.php) whic is requsted by an AJAX client script ... enough.) Edit: what about LibEvent? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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484 views

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concurrency - Can multiple threads see writes on a direct mapped ByteBuffer in Java?

I'm working on something that uses ByteBuffers built from memory-mapped files (via FileChannel.map()) as well as ... can rely on that though. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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488 views

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concurrency - Why is there no implicit parallelism in Haskell?

Haskell is functional and pure, so basically it has all the properties needed for a compiler to be able to ... What are the practical reasons? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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592 views

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concurrency - run multiple instances of python script simultaneously

I am trying to create 86 instances of task.py to run simultaneously. import sys import subprocess for file in range( ... str(filen)+'out.csv']) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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560 views

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concurrency - Is there any way to atomically update two collections in MongoDB?

I have a collection of messages: { messageid: ObjectId userid: ObjectId message: string isread: true|false } ... other collection in one shot? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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591 views

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concurrency - How do I run two python loops concurrently?

Suppose I have the following in Python # A loop for i in range(10000): Do Task A # B loop for i ... I run these loops simultaneously in Python? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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618 views

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concurrency - Java BlockingQueue take() vs poll()

When consuming values from a Queue in an infinite loop -- what would be more efficient: 1) Blocking on the Queue ... ; } Thread.sleep(1000); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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320 views

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concurrency - Java 8 Unsafe: xxxFence() instructions

In Java 8 three memory barrier instructions were added to Unsafe class (source): /** * Ensures lack of ... though). Thanks in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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501 views

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concurrency - What is a cache hit and a cache miss? Why would context-switching cause cache miss?

From the 11th Chapter(Performance and Scalability) and the section named Context Switching of the JCIP book: When a new ... a lot of cache miss? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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452 views

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concurrency - How do I know if this C# method is thread safe?

I'm working on creating a call back function for an ASP.NET cache item removal event. The documentation says I ... (i.e. a race condition) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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