'Twas brillig, and Zbigniew Jędrzejewski-Szmek at 01/10/12 09:42 did gyre and gimble: > On Sat, Sep 29, 2012 at 09:02:11PM +0100, Colin Guthrie wrote: >> 'Twas brillig, and Kok, Auke-jan H at 28/09/12 20:09 did gyre and gimble: >>> 1) people should fix 'make' to just allow `-j` without an argument >>> (seriously, dude ;^) ) >> >> Going dangerously off-topic, but two points: >> >> If you're using -j I've always gone under the impression you want the >> value to be #cores+1, not #cores. That way you keep your machine working >> full tilt. >> >> But regardless, why not use "make -l" anyway? This way it's tied to >> system load which is likely a more prudent method to decide whether or >> not new make jobs are issued - e.g. if you happen to be running a make >> process that is io-intensive, you likely want to run less of them, but >> if you've got a couple jobs one of which is io intensive then some of >> your cpu cores might be mostly idle... -l should allow you to max things >> out better. > > Yeah, -l seems better. But than you still want a load of #cores+1, no? > And -l requires an argument too, so it has exactly the same > inconvinience as -j.
I thought -l was based on the Load Average of the system which is separate from #cores. So if I like keeping my LA below 1.5, I'd just use -l 1.5. and this wouldn't really matter how many cores I have. That said, I'm prepared to be wrong here as I've not really read up about it much! :) Col -- Colin Guthrie gmane(at)colin.guthr.ie http://colin.guthr.ie/ Day Job: Tribalogic Limited http://www.tribalogic.net/ Open Source: Mageia Contributor http://www.mageia.org/ PulseAudio Hacker http://www.pulseaudio.org/ Trac Hacker http://trac.edgewall.org/ _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
