Re: Informix dual processor scalability

According to my rusty memory, the reason for this is something about the overhead necessary to handle multiple processors only being overwhelmed by the performance increase after three processors. So you should tune as tho' you only have a single processor... :-( HTH. }Does anyone have any info on the following problem? We are using Informix }version 7.10.UC1 for Intel UnixWare 2.01 on single processor and SMP }machines. } }Using Informix on 1 processor we achieve good performance. If we switch to }2 processors, then our performance actually degrades. We have been given }some advice on tuning the system for dual processor machines and we have }tried different settings for virtual processors and processor affinity. }We managed to get an improvement, but the best scaling we can get is }about 1.25. } }If we move to a quad processor system the problem goes away and we }approach expected performance levels. } }Has anyone else experienced this? } } -- Cheers, Billy "Have you got it yet?" (c) Dazza, 1995