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Setting the TASKQ_DYNAMIC flag will create a taskq with dynamic semantics. Initially only a single worker thread will be created to service tasks dispatched to the queue. As additional threads are needed they will be dynamically spawned up to the max number specified by 'nthreads'. When the threads are no longer needed, because the taskq is empty, they will automatically terminate. Due to the low cost of creating and destroying threads under Linux by default new threads and spawned and terminated aggressively. There are two modules options which can be tuned to adjust this behavior if needed. * spl_taskq_thread_sequential - The number of sequential tasks, without interruption, which needed to be handled by a worker thread before a new worker thread is spawned. Default 4. * spl_taskq_thread_dynamic - Provides the ability to completely disable the use of dynamic taskqs on the system. This is provided for the purposes of debugging and troubleshooting. Default 1 (enabled). This behavior is fundamentally consistent with the dynamic taskq implementation found in both illumos and FreeBSD. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Closes #458 |
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