On 07/25/12 18:04, David Seikel wrote: > On Tue, 24 Jul 2012 21:53:07 -0700 "Enlightenment SVN" > <no-re...@enlightenment.org> wrote: > > > Log: > > packaging/slackware: > > > > - eeze mount doesn't fit well anymore with Slackware current and > > udisks backend seems to work pretty well now, so enable it by default. > > - eyesight doesn't build anymore without poppler and mupdf needs > > extra dependency, so disable it for now. > > - makes thing compile fater with make -j5. > > Um, is this for general use, or specific to your build machine? -j5 > might actually slow things down for people with less than 4 cores. > It's generally better to actually detect the number of cores.
Well, this is svn, we can not talk about general use. It speeds up compilation for me, which matters because I build everyday and make the integration/test for SlackE17. Released script are different. Anyway, Patrick Volkerding builds most of Slackware with a default of "make -j7" and that is what a common Slacker will find in an official SlackBuild. They use to read the script before launching it :-) I could have made it tunable, though, but it's actually faster and less error prone to change a single digit in the "functions" file than passing an env variable on the command line. > Make's -j option can also be memory bound, but in my experience EFL > does not have that problem. In another unrelated project, using the > number of free GB instead of the number of cores plus one for the -j > option is better, as otherwise it slows down a lot when it starts > thrashing swap. > > On the other hand, last time I experimented with make -j on EFL, it did > not make any measurable difference beyond 2 cores and 2GB. Make -j3 to > make -j12 ran at about the same speeds. Everything is so small it > barely gets a chance to do much good before it's already finished with > any one source file, plus the bulk of the time is spent doing non make > things. > > -- > A big old stinking pile of genius that no one wants > coz there are too many silver coated monkeys in the world. -- Jérôme Pinot http://ngc891.blogdns.net/
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