-l is utterly useless. Load average is computed too slowly; by the time
it passes any useful threshold the actual make load will have spiralled
out of control.
If that's the case, exactly that reasoning should be written in the
documentation.
Go and shoot the morons who wrote those scripts. The make -j value
should never be encoded in any file; it should only ever be set by the
user invoking the actual top level make command.
Again, such a recommendation should be in the manual.
However, for practical reasons, I still think GNU Make should offer some
simple heuristic for people without the necessary time or inclination to
calculate their own optimum value (that would be most humans).
That simple heuristic need not be totally fixed. The user could provide
their own factor for a simple "CPU * <factor>" formula, something like
"-jcpufactor 1.5" could do the trick. I just want to spare the user the
effort to retrieve the CPU count, which is always a small,
system-dependant pain.
Please copy me on the answers, as I'm not on this list.
Regards,
R. Diez
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