[Lldb-commits] [PATCH] D13727: Add task pool to LLDB

Greg Clayton via lldb-commits lldb-commits at lists.llvm.org
Thu Oct 15 10:35:27 PDT 2015

clayborg added a comment.

In http://reviews.llvm.org/D13727#268084, @tberghammer wrote:

> Addressing comments from the discussion with destroying the treads not in use while keeping a global thread pool with at most hardware_concurrency threads.

We should perf test this, but I would be OK with parked threads to tell the truth. I think we should prove they are taking up resources first before we try and destroy them.

> IMO this update also simplifies the implementation of the ThreadPool with removing the conditional_variable.


> A possible future improvement is to destroy the threads only if they are idle for a given time (e.g. 50 ms) so we still don't have them hanging around while we can avoid the possibly unnecessary thread creation and destroyation in case the tasks coming in slowly.

Not sure what the right timeout would be, I would rather just leave them parked and ready unless we prove they are taking up resources. They are going to be parked in the kernel awaiting synchronization, so I don't really see the point of tearing the thread down.


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