thread_concurrency
On Solaris, mysqld will call thr_setconcurrency() with this value. thr_setconcurrency() permits the application to give the threads system a hint for the desired number of threads that should be run at the same time.
I had noticed that it is set to 10 on my system, though I only have 2 CPUs (I've also seen that the recommended value is #CPUS*2. So, I was considering dropping it to 4. But, after reading the above, I wonder if it makes difference on a Linux system (or any other non-Solaris system).
-bill
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