How normal mysql server 5.1 uses multiple cores
Hi All, Can anyone provide me any input on How to make mysql use multiple CPU cores avaliable. I am sorry if I am souding very unclear with this. Let me know if you have any questions. Thanks in advance. -- Regards, Manasi Save Artificial Machines Pvt Ltd. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: How normal mysql server 5.1 uses multiple cores
MySQL is already a multithreaded process, even though you only see a single process. Note that it doesn't scale very well above eight or so cores, especially InnoDB iirc. If you are wondering about parallel query execution (that is, splitting a single query over multiple cores for faster execution), that is currently not supported by MySQL. On Tue, Nov 24, 2009 at 12:02 PM, Manasi Save manasi.s...@artificialmachines.com wrote: Hi All, Can anyone provide me any input on How to make mysql use multiple CPU cores avaliable. I am sorry if I am souding very unclear with this. Let me know if you have any questions. Thanks in advance. -- Regards, Manasi Save Artificial Machines Pvt Ltd. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=vegiv...@tuxera.be
Re: How normal mysql server 5.1 uses multiple cores
Hi Johan, Thanks for the quick response. Is there any command available in mysql using which I can check how much CPU is being used by each mysql thread. Or any article where how mysql multi-threading works. -- Thanks and Regards, Manasi Save Artificial Machines Pvt Ltd. MySQL is already a multithreaded process, even though you only see a single process. Note that it doesn't scale very well above eight or so cores, especially InnoDB iirc. If you are wondering about parallel query execution (that is, splitting a single query over multiple cores for faster execution), that is currently not supported by MySQL. On Tue, Nov 24, 2009 at 12:02 PM, Manasi Save manasi.s...@artificialmachines.com wrote: Hi All, Can anyone provide me any input on How to make mysql use multiple CPU cores avaliable. I am sorry if I am souding very unclear with this. Let me know if you have any questions. Thanks in advance. -- Regards, Manasi Save Artificial Machines Pvt Ltd. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=vegiv...@tuxera.be -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: How normal mysql server 5.1 uses multiple cores
the command 'top -H' will show you the individual threads with their CPU use, but I'm afraid I don't know how to link that up with a MySQL 'show processlist'. On Tue, Nov 24, 2009 at 12:22 PM, Manasi Save manasi.s...@artificialmachines.com wrote: Hi Johan, Thanks for the quick response. Is there any command available in mysql using which I can check how much CPU is being used by each mysql thread. Or any article where how mysql multi-threading works. -- Thanks and Regards, Manasi Save Artificial Machines Pvt Ltd. MySQL is already a multithreaded process, even though you only see a single process. Note that it doesn't scale very well above eight or so cores, especially InnoDB iirc. If you are wondering about parallel query execution (that is, splitting a single query over multiple cores for faster execution), that is currently not supported by MySQL. On Tue, Nov 24, 2009 at 12:02 PM, Manasi Save manasi.s...@artificialmachines.com wrote: Hi All, Can anyone provide me any input on How to make mysql use multiple CPU cores avaliable. I am sorry if I am souding very unclear with this. Let me know if you have any questions. Thanks in advance. -- Regards, Manasi Save Artificial Machines Pvt Ltd. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=vegiv...@tuxera.be -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=vegiv...@tuxera.be
Re: How normal mysql server 5.1 uses multiple cores
2009/11/24 Johan De Meersman vegiv...@tuxera.be: If you are wondering about parallel query execution (that is, splitting a single query over multiple cores for faster execution), that is currently not supported by MySQL. [offtopic] Probably is something stupid, but could that be done with ndb cluster on a single host? Anyway, I suppose performance loses on distributed joins and so on would outcome multiple-core benefits. And for most queries, the bottleneck is usually on disk access, not processor. Has anybody done any serious testing on this? -- Jaime Crespo MySQL Java Instructor Warp Networks http://warp.es -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: How normal mysql server 5.1 uses multiple cores
At 06:44 AM 11/24/2009, you wrote: 2009/11/24 Johan De Meersman vegiv...@tuxera.be: If you are wondering about parallel query execution (that is, splitting a single query over multiple cores for faster execution), that is currently not supported by MySQL. [offtopic] Probably is something stupid, but could that be done with ndb cluster on a single host? Anyway, I suppose performance loses on distributed joins and so on would outcome multiple-core benefits. And for most queries, the bottleneck is usually on disk access, not processor. Has anybody done any serious testing on this? Jaime, Well it all depends on the SQL that is being executed, the table structure and the size of the query. Now for a particular case you can do your own benchmarking quite easily to see if disk speed is more relevant than CPU speed. Copy your tables into a MEMORY table and do the joins there. Compare that to a disk join (reset the query cache) and see the improvement. I'm guessing you will probably see a 300% improvement over disk. As mentioned earlier, MySQL does not scale up very well with multiple processors which is why it is better to scale out horizontally with clusters. Mike -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
