From: Thomas Monjalon <thomas.monjalon@6wind.com>
To: "Wiles, Keith" <keith.wiles@intel.com>
Cc: Neil Horman <nhorman@redhat.com>,
Neil Horman <nhorman@tuxdriver.com>,
dev@dpdk.org, "Mcnamara, John" <john.mcnamara@intel.com>
Subject: Re: [dpdk-dev] [PATCH] validate_abi: build faster by augmenting make with job count
Date: Wed, 20 Jul 2016 22:15:28 +0200 [thread overview]
Message-ID: <7923871.JAtBDztydg@xps13> (raw)
In-Reply-To: <CDB4778C-5EF7-4728-A77D-229F76A13225@intel.com>
2016-07-20 19:47, Wiles, Keith:
> On Jul 20, 2016, at 12:48 PM, Neil Horman <nhorman@redhat.com> wrote:
> > On Wed, Jul 20, 2016 at 07:40:49PM +0200, Thomas Monjalon wrote:
> >> 2016-07-20 13:09, Neil Horman:
> >>> From: Neil Horman <nhorman@redhat.com>
> >>> +if [ -z "$MAKE_JOBS" ]
> >>> +then
> >>> + # This counts the number of cpus on the system
> >>> + MAKE_JOBS=`lscpu -p=cpu | grep -v "#" | wc -l`
> >>> +fi
> >>
> >> Is lscpu common enough?
> >>
> > I'm not sure how to answer that. lscpu is part of the util-linux package, which
> > is part of any base install. Theres a variant for BSD, but I'm not sure how
> > common it is there.
> > Neil
> >
> >> Another acceptable default would be just "-j" without any number.
> >> It would make the number of jobs unlimited.
>
> I think the best is just use -j as it tries to use the correct number of jobs based on the number of cores, right?
No Keith, -j alone use as much jobs as it can create, i.e. much more than
the number of CPUs.
I have no measure but I remember it is less efficient than giving a number
based on available CPUs (with a multiply factor to avoid idling between jobs).
For a default value, both approaches are fine.
next prev parent reply other threads:[~2016-07-20 20:15 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-20 17:09 Neil Horman
2016-07-20 17:40 ` Thomas Monjalon
2016-07-20 17:48 ` Neil Horman
2016-07-20 19:47 ` Wiles, Keith
2016-07-20 20:15 ` Thomas Monjalon [this message]
2016-07-20 20:16 ` Neil Horman
2016-07-20 22:32 ` Wiles, Keith
2016-07-21 13:54 ` Neil Horman
2016-07-21 14:09 ` Wiles, Keith
2016-07-21 15:06 ` Neil Horman
2016-07-21 15:22 ` Wiles, Keith
2016-07-21 18:34 ` Neil Horman
2016-07-24 18:08 ` Wiles, Keith
2016-08-01 11:49 ` Neil Horman
2016-08-01 16:16 ` Wiles, Keith
2016-08-01 18:08 ` Neil Horman
2016-07-20 19:02 ` [dpdk-dev] [PATCH v2] " Neil Horman
2016-07-22 10:46 ` Thomas Monjalon
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