[darcs-users] Review: Use make -j4 to run disttest.

[Trent W. Buck]

E.Y.Kow at brighton.ac.uk writes:

> Thu Nov  6 11:43:26 GMT 2008  Eric Kow <E.Y.Kow at brighton.ac.uk>
>   * Use make -j4 to run disttest.
>   Trent had done some Makefile cleanups to eliminate the naughty practice
>   of calling $(MAKE) -j4 within make.  This patch restores the parallel
>   builds (which makes tests run faster) without the naughtiness.
>
>
> New patches:
>
> [Use make -j4 to run disttest.
> Eric Kow <E.Y.Kow at brighton.ac.uk>**20081106114326
>  Ignore-this: 5818b80001e1ce589057b6adc61c4973
>  Trent had done some Makefile cleanups to eliminate the naughty practice
>  of calling $(MAKE) -j4 within make.  This patch restores the parallel
>  builds (which makes tests run faster) without the naughtiness.
> ] changepref test
> make disttest
> make -j4 disttest

Looks OK to me.

Just for my peace of mind, can someone assert that -j4 significantly
increases build time even on single-core uniprocessor systems?
Incidentally, why -j4 and not -j2 or -j8?

I've just kicked off this test on my machine (600MHz Celeron, 1GB RAM),
but obviously it won't finish for about an hour:

    map time bash -c '{ make maintainer-clean && autoconf && ./configure && make 0 darcs ;} &>/dev/null'  -- '' -j2 -j4 -j8