[Mageia-dev] make -l ?

Mon Sep 3 10:43:22 CEST 2012

'Twas brillig, and Pascal Terjan at 03/09/12 00:18 did gyre and gimble:
+> On Sun, Sep 2, 2012 at 5:14 PM, Jose Jorge <lists.jjorge at free.fr> wrote:
+>> Le 31/08/2012 11:40, Pascal Terjan a écrit :
+>>
+>>> Currently %make is expanded to make -j<nb cpu>
+>>>
+>>> I'd like it to be replaced with make -l<nb cpu>
+>>>
+>>>
+>> Some activities, like USB transfers are seen as huge system load (I often
+>> get more than 4 on a monocpu system, while is CPU is idle to compile. So I
+>> think we may end with a side effect that build time will be longer....
+> 
+> Currently I see the following cases:
+> - 1 big job with parallel makefile (like kernel), it will probably run
+> more builds in parallel as building 24 .o does not cause a load of 24
+> - 2 big jobs with parallel makefile, it will probably reduce things as
+> currently each of them run 24 builds in parallel, leading to a load of
+> about 40, now the load will be 24
+> - 1 big job and a small one: I am not sure there will be much change
+> - 1 or 2 small jobs: no change
+> 
+> And yes the load is not only the cpu, but that's a good thing. If we
+> have 40 processes trashing the disk it's better to not start more even
+> if we have 20 cpu idling
+> 
+> But yes it needs to be tested
+
+And of course in the context of the BS, the IO load will not be
+artificially high from USB type transfers so it will probably be "real" IO.
+
+Col
+
+
+-- 
+
+Colin Guthrie
+colin(at)mageia.org
+http://colin.guthr.ie/
+
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