JDK-8155232 : Augment Workgang to run task with a given number of threads
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 9
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2016-04-27
  • Updated: 2016-05-26
  • Resolved: 2016-05-02
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JDK 9
9 b120Fixed
Related Reports
Blocks :  
JDK-8151814 - Tune thread usage for concurrent tasks
Blocks :  
JDK-8155093 - Move the number of active worker threads out of WorkGang
Blocks :  
JDK-8155230 - Tune thread usage for mark bitmap clear
Blocks :  
JDK-8155229 - Tune thread usage for live data clearing
Blocks :  
JDK-8153507 - Improve Card Table Clear Task
Duplicate :  
JDK-8155231 - Augment Workgang to run task with a given number of threads
Relates :  
JDK-8155709 - Introduce an option to set the chunk size for clear actions
Description
In many cases more direct control about the number of threads for a given task is required. The current way of doing so is quite involved, requiring a few lines of code where every part is important.

Like:

size_t new_active_threads = ...
size_t old_active_threads = gang->num_active_threads();
gang->set_active_threads(new_active_threads);
gang->run_task(...);
gang->set_active_threads(old_active_threads);

The proposal is to add a method that allows you to set the number of threads to use for the given task directly.