Messages in this thread | | | Date | Sat, 24 Feb 2001 08:44:26 -0500 (EST) | From | "Mike A. Harris" <> | Subject | Re: Detecting SMP |
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On Tue, 20 Feb 2001, Burton Windle wrote:
>Hello. Is there a way, when running a non-SMP kernel, to detect or >otherwise tell (software only; the machine is 2400 miles away) if the >system has SMP capibilties? Would /proc/cpuinfo show two CPUs if the >kernel is non-SMP? Thanks! > >(btw, the kernel in question is a stock RH6.2 kernel 2.2.14-5, and yes, I >know I should update it anyways and that a SMP kernel will run on a UP >system)
Yes, there are several ways. How do you want to know how to do it, in C, or a bash script? sysconf is one way, parsing /proc/cpuinfo and /proc/stat is another. Beware though, if you parse /proc/cpuinfo or stat, it is very different on different architectures, particularly sparc.
Here is some code which should do it more or less correctly on any arch:
ncpus=$(egrep -c ^cpu[0-9]+ /proc/stat || :) [ "$ncpus" = "0" ] && ncpus=1
---------------------------------------------------------------------- Mike A. Harris - Linux advocate - Free Software advocate This message is copyright 2001, all rights reserved. Views expressed are my own, not necessarily shared by my employer. ---------------------------------------------------------------------- if (argc > 1 && strcmp(argv[1], "-advice") == 0) { printf("Don't Panic!\n"); exit(42); }
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