Re: IDS 9.4 multithread help with new hardware

On Apr 9, 9:52 am, "Art S. Kagel (Oninit)" <a...@oninit.com> wrote: > Gary Quiring wrote: > > I am looking at a Sun cool thread server to replace a Sun v880 server > > that is going back on a lease soon. My interest in the cool thread > > server is power/heat reduction.  We have a small computer room that > > has maxed out our air conditioning. > > > I am being told the cool thread servers will only perform well with > > apps that use many threads.  My 9.4 oninit process is never using more > > than 2 threads. > > Actually your oninit processes use many many threads, at least one per > client connection and several more for polling and other internal > overhead activities.  The reason you are not seeing them at the OS level > is that they are not OS threads.  IDS has its own thread library and all > threads except the main thread and the OS KAIO thread are implemented > internally using this library.  There are two reasons for this.  The > first is simply practical, when the original Online Dynamic Server v6.00 > was written there were at least three competing threading models plus > the windows thread model and Informix did not want to have to support > all of those differing models each with their own quirks, failings, and > features.  The second and more important reason is that by managing its > own threads using a dedicated thread manager and context control > specifically designed to support IDS's needs. IDS can process many more > thread context switches than any OS level thread library. > > Now the real question is: will IDS be able to take good advantage of the > internal architecture of the Cool Thread Server to run even faster?  I > don't know.  You'll have to test it yourself.  But please post the > results of any testing you do here. > > As far as how can you tune IDS to take best advantage of multiple > processor and multi-core processors?  You can start more CPU VPs.  I did > some testing back in the days of 400-500 MHZ processors.  On Sun > processors faster than 450MHZ 2 CPU VPs per processor works well.  With > the more recent 1.2GHZ single core processors I've seen as many as 3 CPU > VPs per processor run with good results.  On the dual core 2.2GHZ Ultra > Sparc IV processors, I have not known anyone to try running more than 4 > per core - though using my old benchmark tests as a guide - each core > could support up to five CPU VPs (IBM believes that Sparc dual core > processors are equivalent to about 1.5 cores at the rated speed so that > would mean the ability to support up to 7 CPU VPs per processor or 3-4 > per core). > > Art S. Kagel > Oninit > > > > > Is there a way to tune how many threads the oninit process can use? > > > Cool Thread link: > >http://cooltools.sunsource.net/cooltst/ > > > Thanks > > Gary Quiring > > _______________________________________________ > > Informix-list mailing list > > Informix-l...@iiug.org > >http://www.iiug.org/mailman/listinfo/informix-list- Hide quoted text - > > - Show quoted text - Art, thank you for your help/quick response. I will probably have to abandon the attempt of trying the cool thread server. We are not a large shop (1 developer and myself) so I don't think it would be a safe bet at taking the chance. Maybe somebody else will find this thread and chime in with their results if they have one. Gary Quiring