number of processors

[Philipp Gortan]

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hi community,

I am working on 3 machines simultaneously:
- - a linux box, 1 processor
- - a sun machine, 2 processors
- - and a sun machine, 4 processors

I'd like to have a script that guesses/reads out the number of
processors each machine has and uses this as a parameter for the make
command, e.g. make -j 1, make -j 2 and make -j 4, respectively.

under linux, i find the information in the proc device, whereas solaris
features a uname -X with NumCPU. So I built the following script:

<code>

AC_MSG_CHECKING([number of processors])
PROC_NR=""            

case "$MACHTYPE" in
~     i686-*-linux)     test -f /proc/cpuinfo && \
                        PROC_NR=`grep processor /proc/cpuinfo | \
                        wc -l | awk '{print $1}'`
        ;;
~     sparc-*-solaris*) PROC_NR=`uname -X | grep NumCPU | \
                        awk '{print $3}'`
        ;;
~     *)
        AC_MSG_ERROR([Sorry, we don't support $MACHTYPE])
        ;;
esac

AC_SUBST([MAKE], ["make -j $PROC_NR"])
AC_MSG_RESULT([$PROC_NR])

</code>

the script works fine on all machines, but i'm not especially satisfied,
as for each new machine added, the script has to be manually modified.

so, my question is:
is there a more sophisticated way to figure out the number of processors
of the host machine?

thanks for you wisdom ;-)
cu, philipp
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