From owner-freebsd-java@FreeBSD.ORG  Tue Jan 31 12:05:21 2006
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Date: Tue, 31 Jan 2006 12:04:43 +0000 (GMT)
From: Alex Hayward <xelah-freebsd@xelah.com>
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To: Andrew Reilly <andrew-freebsd@areilly.bpc-users.org>
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Subject: Re: Compiling jdk15 on amd64: how long?
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On Tue, 31 Jan 2006, Andrew Reilly wrote:

> On Fri, Jan 20, 2006 at 07:48:34PM +0000, Alex Hayward wrote:
> > On Fri, 20 Jan 2006, Andrew Reilly wrote:
> >
> > > Hi all,
> > >
> > > Any idea how long this is supposed to take?  I'm patched and all,
> > > and the linux javac seems to be working ok, but I have two javac
> > > processes (one per core) at the top of my "top" list that have now
> > > consumed about 170 minutes.
> > >
> > > cvsupped ports tree yesterday, fetched bsd patch 2 today.
> > >
> > > Uname -a:
> > > FreeBSD new.reilly.home 6.0-RELEASE FreeBSD 6.0-RELEASE #0: Wed Jan 18 23:44:47 UTC 2006     root@new.reilly.home:/usr/obj/usr/src/sys/SMP  amd64
> > >
> > > Hmm.  Maybe I should bring the base system forward to 6.0-STABLE
> > > before trying this?
> > >
> > > Maybe I should start with jdk14?
> > >
> > > Any help or suggestions, or even confirmation that this has been
> > > done before would be greatly appreciated.
> >
> > The last time I compiled it on amd64 I had to disable SMP to make it
> > finish.
>
> I'm new to the SMP thing: what's the easiest way to do that?  Do
> I have to re-boot to a GENERIC kernel, or can I tweak a sysctl
> knob to turn one CPU off at whim?
>
> Thanks for the advice.

Put kern.smp.disabled=0 in /boot/loader.conf. sysctl -w kern.smp.active=0
also works but seems to make the machine crash after a while.