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<H1>[Mageia-dev] make -l ?</H1>
<B>Colin Guthrie</B>
<A HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20make%20-l%20%3F&In-Reply-To=%3C50446DAA.9010607%40colin.guthr.ie%3E"
TITLE="[Mageia-dev] make -l ?">mageia at colin.guthr.ie
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<I>Mon Sep 3 10:43:22 CEST 2012</I>
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<PRE>'Twas brillig, and Pascal Terjan at 03/09/12 00:18 did gyre and gimble:
><i> On Sun, Sep 2, 2012 at 5:14 PM, Jose Jorge <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">lists.jjorge at free.fr</A>> wrote:
</I>>><i> Le 31/08/2012 11:40, Pascal Terjan a écrit :
</I>>><i>
</I>>>><i> Currently %make is expanded to make -j<nb cpu>
</I>>>><i>
</I>>>><i> I'd like it to be replaced with make -l<nb cpu>
</I>>>><i>
</I>>>><i>
</I>>><i> Some activities, like USB transfers are seen as huge system load (I often
</I>>><i> get more than 4 on a monocpu system, while is CPU is idle to compile. So I
</I>>><i> think we may end with a side effect that build time will be longer....
</I>><i>
</I>><i> Currently I see the following cases:
</I>><i> - 1 big job with parallel makefile (like kernel), it will probably run
</I>><i> more builds in parallel as building 24 .o does not cause a load of 24
</I>><i> - 2 big jobs with parallel makefile, it will probably reduce things as
</I>><i> currently each of them run 24 builds in parallel, leading to a load of
</I>><i> about 40, now the load will be 24
</I>><i> - 1 big job and a small one: I am not sure there will be much change
</I>><i> - 1 or 2 small jobs: no change
</I>><i>
</I>><i> And yes the load is not only the cpu, but that's a good thing. If we
</I>><i> have 40 processes trashing the disk it's better to not start more even
</I>><i> if we have 20 cpu idling
</I>><i>
</I>><i> But yes it needs to be tested
</I>
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
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