Comments on: InnoDB thread concurrency http://www.mysqlperformanceblog.com/2006/06/05/innodb-thread-concurrency/ Percona's MySQL & InnoDB performance and scalability blog Sat, 11 Feb 2012 16:45:54 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: vi_shen http://www.mysqlperformanceblog.com/2006/06/05/innodb-thread-concurrency/comment-page-1/#comment-813995 vi_shen Thu, 18 Aug 2011 13:50:13 +0000 http://www.mysqlperformanceblog.com/2006/06/05/innodb-thread-concurrency/#comment-813995 Does a thread which "ENTER" cause (thread->n_tickets_to_enter_innodb > 0) is include in "entered_thread" ? Does it mean we can have more thread than innodb_thread_concurrency which inside innodb_kernel ? suppose innodb_thread_concurrency=8, 9 threads have free tickets and all of them ENTER. Does a thread which “ENTER” cause (thread->n_tickets_to_enter_innodb > 0) is include in “entered_thread” ?

Does it mean we can have more thread than innodb_thread_concurrency which inside innodb_kernel ?

suppose innodb_thread_concurrency=8, 9 threads have free tickets and all of them ENTER.

]]> By: InnoDB's concurrency problems on multi core boxes fixed?! http://www.mysqlperformanceblog.com/2006/06/05/innodb-thread-concurrency/comment-page-1/#comment-350327 InnoDB's concurrency problems on multi core boxes fixed?! Sat, 30 Aug 2008 06:21:39 +0000 http://www.mysqlperformanceblog.com/2006/06/05/innodb-thread-concurrency/#comment-350327 [...] “Killed”, but never dying. Based on what I’d read in High Performance MySQL, and articles like this one, I tried twiddling with innodb_thread_concurrency, innodb_concurrency_tickets, and [...] [...] “Killed”, but never dying. Based on what I’d read in High Performance MySQL, and articles like this one, I tried twiddling with innodb_thread_concurrency, innodb_concurrency_tickets, and [...]

]]> By: Ben Clewett http://www.mysqlperformanceblog.com/2006/06/05/innodb-thread-concurrency/comment-page-1/#comment-304181 Ben Clewett Fri, 23 May 2008 10:40:41 +0000 http://www.mysqlperformanceblog.com/2006/06/05/innodb-thread-concurrency/#comment-304181 Thanks for the clear posting including the equation on number of threads: 2*(NumCPUs+NumDisks) I have 4 physical CPUs, in 2x duel cores with shared cache. But Linux nicely turns these into 8 logical CPUs, where each pair share 80% of CPU resources. With 4xPhysical and 8xLogical, what value of CPU count should be used? Regards, Ben Thanks for the clear posting including the equation on number of threads:

2*(NumCPUs+NumDisks)

I have 4 physical CPUs, in 2x duel cores with shared cache.

But Linux nicely turns these into 8 logical CPUs, where each pair share 80% of CPU resources.

With 4xPhysical and 8xLogical, what value of CPU count should be used?

Regards,

Ben

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