Berkeley CSUA MOTD:Entry 53213
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2020/11/23 [General] UID:1000 Activity:popular
11/23   

2009/7/28-8/6 [Computer/SW/Database] UID:53213 Activity:nil
7/27    I have an actual technical question here. My MySQL DBA tells me
        that I can't expect a MySQL port to be able to run effectively
        on more than a two CPU box, he says that the extra CPUs will
        sit there unused. Is this true? I have a bunch of new quad core
        servers that I would like to use as Database machines. -ausman
   \_ It's not that simple.  If you stress test your new fancy multi core
      machine, you'll see that mysql doesn't really use all of those
      cores as much as you want.  one way to really use everything is
      shard your data, and run several instances of mysql on one
      machine, then you'll really use all of the cores ! - danh
         \_ http://forums.mysql.com/read.php?24,53893,262315#msg-262315
            (you can probably get it to use four cores)  -tom
            \_ I realize MySQL is free, but what a POS!
               \_ is this a troll?  What do you want?  I've had no problem
                  loading multiple CPUs, yes, you can't have more than one
                  CPU working a a single SQL query, but this has never been
                  a problem for me.  What do you use?
                  \_ Have you ever gone beyond 4?
                     \_ Yes, was not benchmarking and can't be sure how much
                        more throughput I was getting vs. 4 but I have had 8
                        cores processing at near 100% utilization.
                  \_ Well, a modern database should be properly multithreaded.
                     Oracle and MS SQL Server are. A database that slows
                     down when you throw more CPUs at it is a POS.
2020/11/23 [General] UID:1000 Activity:popular
11/23   

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Cache (132 bytes)
forums.mysql.com/read.php?24,53893,262315#msg-262315
Rick James () Date: May 12, 2009 08:47PM * HyperThreading should be turned off -- the two cores clobber each other's cached entries.