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Date:      Sun, 25 Dec 2016 19:28:49 +0100
From:      David Chisnall <theraven@FreeBSD.org>
To:        Nikolai Lifanov <lifanov@FreeBSD.org>
Cc:        freebsd-toolchain@freebsd.org
Subject:   Re: status of WITH_SHARED_TOOLCHAIN
Message-ID:  <0CE94850-0B5C-4270-94C7-F7F83BB0552B@FreeBSD.org>
In-Reply-To: <73e81366-b932-053e-aebf-f8eaebd8ab5a@FreeBSD.org>
References:  <73e81366-b932-053e-aebf-f8eaebd8ab5a@FreeBSD.org>
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[-- Attachment #1 --]
On 25 Dec 2016, at 19:21, Nikolai Lifanov <lifanov@FreeBSD.org> wrote:
> 
> Hi list,
> 
> I would like to understand why WITH_SHARED_TOOLCHAIN is not the default.
> My Raspberry Pi 3 is self-hosting with -j4 and doesn't run out of memory
> if the toolchain is shared. Is there a downside to this option?

Yes, there is a noticeable performance hit.  Buildworld takes 20-50% longer with a shared toolchain.  I don’t know if anyone has done any profiling of rtld to see if there’s any space for optimisation there (I suspect very little).

David


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