Date: Sun, 19 Jul 2020 01:51:56 -0400 From: Aryeh Friedman <aryeh.friedman@gmail.com> To: Greg Lewis <glewis@eyesbeyond.com> Cc: Jonathan Chen <jonc@chen.org.nz>, freebsd-java@freebsd.org Subject: Re: OT: support for multicore javac? Message-ID: <CAGBxaX=aE%2Brhb1TcvKS_-xbsogwTm3%2BL7%2BmfvDjR86KpD_G_-Q@mail.gmail.com> In-Reply-To: <20200719052757.GA45160@misty.eyesbeyond.com> References: <CAGBxaXkyNBa7RdK5cbSHH2dm5_7vk-Kb=Tf9gB1x8PpUmQD-rA@mail.gmail.com> <CAJuc1zMk2bNt=LbLCx1LvvAi=ip3bqRh1EXnsXUom8CpsvKRKw@mail.gmail.com> <CAGBxaXmSsY3-eoq97DpP6X06oVnUJbhsFYSeXYp%2BYWbyz7hzyg@mail.gmail.com> <CAJuc1zNmv5L-k2XiYMRxzJQgZSO0-Y3n2jCVaCrJQu58maCwpA@mail.gmail.com> <20200719052757.GA45160@misty.eyesbeyond.com>
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On Sun, Jul 19, 2020 at 1:28 AM Greg Lewis <glewis@eyesbeyond.com> wrote: > On Sat, Jul 18, 2020 at 12:50:36PM +1200, Jonathan Chen wrote: > > On Sat, 18 Jul 2020 at 12:31, Aryeh Friedman <aryeh.friedman@gmail.com> > wrote: > > >> I'm building eclipse, and invocations to javac seem to spread across > > >> multiple cores when building with multiple threads using openjdk11; at > > >> least that's what "top -H" tells me. I don't see what smart-javac > > >> brings to the table. > > > > > > I don't use eclipse or any IDE and many people other users don't > also. All this is done by eclipse not the command line tools and people > who work with them need good support for them (see the README in sjavac... > https://github.com/weetmuts/sjavac ... as to the reasons for not using an > IDE see > https://docs.freebsd.org/cgi/getmsg.cgi?fetch=31816+0+current/freebsd-questions > > > > > > > My statement should be re-phrased as: When I'm building the eclipse > > port from the command line, with maven, each javac invocation spreads > > the work over multiple cores. You can easily view this with "top -H". > > FWIW, sjavac has been used by default since JDK 9, so yes, you'd expect to > see multiple cores being used with openjdk11. The sjavac Github reference > above is a backport to openjdk8. > Does that mind if I use 9+ I can give the -j option and it will work as the sjavac docs say it will?.... the main reason why I decided no to use the github version even though I use openjdk 8 by default is it had no way to pass options down to the wrapped javac such as (which is the default I use in almost all my projects with the most important one being -Werror): -Xprefer:source -implicit:none -Xlint -Xdiags:verbose -Werror -- Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org
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