Fixes #5994 - QueuedThreadPool "free" threads #5995
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Introduced to QueuedThreadPool: * getMaxReservedThreads() * getAvailableReservedThreads() * getAvailableThreads() * getReadyThreads() * getLeasedThreads() Also few small code cleanups. Signed-off-by: Simone Bordet <simone.bordet@gmail.com>
gregw
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Feb 23, 2021
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Updated from my comment on the issue...
We need a good vocab to describe all the states a thread can be in and then matching getters and JMX fields:
- inactive: not started but there is capacity to start another thread
- idle: started and waiting in the pool for a task
- reserved: taken from the pool but reserved to do a task
- leased: taken from the pool to do a (budgeted - maxReserved) task like selecting
- utilised: taken from the pool for a non-leased task.
So we have some invariants and derived stats:
max = inactive + idle + reserved + leased + utilised
threads = idle + reserved + leased + utilised
busy = leased + utilised
ready = idle + reserved
utilised = threads - idle - reserved - leased
available = max - busy
maxAvailable = max - leased
utilisation = utilised / maxAvailable # 0.0 means idle, 1.0 means at capacity
gregw
requested changes
Feb 23, 2021
jetty-util/src/main/java/org/eclipse/jetty/util/thread/QueuedThreadPool.java
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jetty-util/src/main/java/org/eclipse/jetty/util/thread/QueuedThreadPool.java
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Updates after review. Signed-off-by: Simone Bordet <simone.bordet@gmail.com>
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I'm keen to +1 this PR just because it's javadoc'd! :-) |
gregw
approved these changes
Feb 23, 2021
This was referenced Mar 10, 2021
This was referenced Mar 10, 2021
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Introduced to QueuedThreadPool:
Also few small code cleanups.
Signed-off-by: Simone Bordet simone.bordet@gmail.com