Re: KAIO

rt wrote: > > Whats the real story on KAIO and HP 10.20. Most posts list better > performance with KAIO. When post report decreased performance it > usually is fixed by correcting the configuration. Is there a split > camp on KAIO?? The concensus is that KAIO is better than AIO VPs. At Bloomberg we are using AIO VPs with twice the performance of KAIO but that is either: 1) Platform dependency (DGUX does not have built in Kernel Asynch IO) 2) A result of the advanced task affinity scripts we use (we affine all oninit processes assigning VPs within each class to processors independently of the other classes and in such a way that the busiest CPU VPs and the busiest AIO VPs run on different processors) or 3) Some combination of both On our platform the DG port team found 50% better performance from KAIO over AIO VP using Informix processor affinity (which only affines CPU class VPs). Using affinity scripts and utilities DG techs helped us develop we get 20% better performance than Informix affinity with AIO VPs both ways and 100% better performance using AIO VPs and our scripts over KAIO with our scripts. No one has tried to duplicate our results from Data General Aviion M88K platforms on any other platform yet. We are testing Informix on Sun platforms and you can be sure that I will test our methods there in the future. Overall all of the reports that I have seen about the HP platform lean heavily toward KAIO. Just keep our results in mind. Art S. Kagel