linux-kernel - Re: Parallel compilation performance regression

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Message-ID: <bf968a2887536459293eaeb40d354fb365b1438d.camel@intel.com>
Date:   Fri, 19 Jun 2020 14:59:58 +0000
From:   "Derrick, Jonathan" <jonathan.derrick@...el.com>
To:     "willy@...radead.org" <willy@...radead.org>
CC:     "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dhowells@...hat.com" <dhowells@...hat.com>
Subject: Re: Parallel compilation performance regression

On Thu, 2020-06-18 at 18:05 -0700, Matthew Wilcox wrote:
> On Thu, Jun 18, 2020 at 11:52:55PM +0000, Derrick, Jonathan wrote:
> > Hi David,
> > 
> > I've been experiencing a performance regression when running a parallel
> > compilation (eg, make -j72) on recent kernels.
> 
> I bet you're using a version of make which predates 4.3:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0ddad21d3e99c743a3aa473121dc5561679e26bb
> 

I am!

# make --version
GNU Make 4.2.1


Thank you Matthew!