Matus UHLAR - fantomas wrote: > On 05.11.08 12:09, Per Jessen wrote: >> I have a very unusual situation (I think): >> >> I am running the exact same system (it was cloned) on several >> single-core and dual-core systems. The only difference is in the >> hardware, i.e. some systems are dual-core. > > cloned? Do you have the same OS kernel with support for more CPUs and > CPUs with more cores on both machines?
Yes, it's the same SMP kernel on all machines. >> I am running spamd with maxchild=25 (the actual number in use is >> controlled externally). > > externally? Sorry, I should have explained - the number of callers of spamd is being controlled elsewhere. >> The single-core systems vary from two to five, sometimes six. >> Perfectly >> normal. On the dual-core systems, I never see more than two active >> children. Not normal. > > Why not normal? Maybe the dualcore CPU can handle all mail fast enough > so there's no need for spawning more children OK, I also know there is a queue building up on the dual-core systems, but hardly any queueing on the single-core. >> Notice that the single-core system reports "handled cleanup of child >> pid nnnnn due to SIGCHLD" which is never seen on the dual-core >> system, and that the dual-core reports "child nnnnn killed >> successfully", which is >> never seen on the single-core system. What am I missing here? > > While I am not sure what do those messages mean, I think that there > should be no difference between handling of processes independently on > number of CPUs/cores whatever. I guess that's problem of OS, not SA. Quite probably, but the symptoms are showing in SA, not in the OS :-) Also, in 3.1.7 this all worked just fine, although with a different kernel version. /Per Jessen, Zürich
