[concurrency-interest] Unbounded thread pool and memory overhead

Rohit Reja rreja2000 at yahoo.com
Mon Aug 25 05:11:46 EDT 2014

I tried using this constructor

 "new ThreadPoolExecutor(10, 100,
                60L, TimeUnit.SECONDS,
>                new LinkedBlockingQueue<Runnable>());"
This results into creation of only 1 thread.
According to the documentation, "If there are more than corePoolSize but less than maximumPoolSize threads running, a new thread will be created only if the queue is full."

Essentially what I want is a cachedThreadPool with max threads < unbounded and queueing of tasks beyond a certain threshold.

- Rohit

On Monday, August 25, 2014 2:15 PM, "mail at sergey-mashkov.net" <mail at sergey-mashkov.net> wrote:

You can simply create instance of ThreadPoolExecutor using its constructor: 


So You can specify bounds 

Kind regards
Sergey Mashkov

-----Original Message-----
From: Rohit Reja <rreja2000 at yahoo.com>
To: "concurrency-interest at cs.oswego.edu" <concurrency-interest at cs.oswego.edu>
Sent: пн, 25 авг. 2014 9:37
Subject: [concurrency-interest] Unbounded thread pool and memory overhead


We are using Executors#newCachedThreadPool() at various places in our product. We recently faced an issue that the threads consumed lots of virtual memory in a machine ( and eventually the system has no memory left) due to lots of threads being created. ( We haven't set the Xss param though).

I have 2 questions here:-

1. Why have this API choose not to have bounded threads ? What would be the best practices while using unbounded thread pools.
2. How can I build a thread pool with a minimum threads that grows to a max bound and then the task submission blocks?


On Thursday, August 14, 2014 6:03 PM, Victor Grazi <vgrazi at gmail.com> wrote:

There's a nice article by Dr. Heinz Kabutz on InfoQ http://www.infoq.com/articles/Hunting-Concurrency-Bugs-1
Heinz always amazes me!

Twitter: @vgrazi
LinkedIn: www.linkedin.com/in/victorgrazi/
Java Concurrent Animated: http://sourceforge.net/projects/javaconcurrenta/
Skype: vgrazi2

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