On Thu, 2007-03-29 at 21:06 +0800, Peter Memishian wrote:
> Indeed -- and I suspect there are other cases of low-hanging fruit. (In
> the case of lint, it was literally a matter of resizing a hash table.) So
> before we get too obsessed with .PARALLEL and other ways to spread out the
> cycles needed by the build, we need to dig into whether those cycles need
> to be spent in the first place.
Indeed.
Another factor is the amount of work done by make itself. One instance
I noticed: If you "truss" an incremental "dmake" of genunix, you will
see an incredible flurry of "stat" calls for source files which don't
exist and will never exist; this is a an artifact of the extensive use
of wildcards in uts/common/Makefile.rules -- there's one wildcard build
rule for each source directory. This means that kernel module makefiles
take time proportional to the square of the total number of source files
to process.
- Bill
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