Re: MULTIPROCESSOR OPTION 7.13

In article <01bbcb91$cc1befe0$654750c6@irwin.interaccess.com>, irwin@objectsoft.com says... > > > >Allen Jantzen <allenj@ndr.com> wrote in article ><327fa20d.27552573@news.netline.net>... >> The Informix DSA Administrators Guide, version 7.1, page 10-18 says >> >> "On some two-processor computers, you should only run one CPU virtual >> processor because the overhead of synchronizing the two virtual >> processors offsets the benefit of distributing the processing" >> >> Of course, using one CPU virtual processor means that the >> MULTIPROCESSOR option should be set to zero, which means that >> I am telling Informix that I don't have more than one processor >> and am basically crippling my server software for parallelism/PDQ. >> >> So far, my tests have been fairly close either way. Can anyone provide >> any further insight into this? >> >> I am using an HP J200 with 2 100 MHZ PA-RISC processors and >> Informix DSA 7.13.UC1 > I've got several Digital Alpha Servers 2100 with different configs (from 1 to 3 CPUs). My experience tell that if you have big querys running at the same time it's very important to configure more than one CPU VP. And that works if the machine has 1 or more CPUs. You may run several instances of Online in the same machine if you have different databases with different uses. It's better (in ALPHA machines) to have many small engines than a large one (the use o CPU vps and buffers are independent). I've a engine to interactive users and other to batch processing. the O.S. works fine under this environment! Best Regards,