From nobody Mon Nov 29 04:36:12 2021 X-Original-To: freebsd-hackers@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 99F3718B6B0B for ; Mon, 29 Nov 2021 04:36:14 +0000 (UTC) (envelope-from sgk@troutmask.apl.washington.edu) Received: from troutmask.apl.washington.edu (troutmask.apl.washington.edu [128.95.76.21]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "troutmask", Issuer "troutmask" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4J2Xby33kKz3sk4; Mon, 29 Nov 2021 04:36:13 +0000 (UTC) (envelope-from sgk@troutmask.apl.washington.edu) Received: from troutmask.apl.washington.edu (localhost [127.0.0.1]) by troutmask.apl.washington.edu (8.16.1/8.16.1) with ESMTPS id 1AT4aCUt082299 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Sun, 28 Nov 2021 20:36:12 -0800 (PST) (envelope-from sgk@troutmask.apl.washington.edu) Received: (from sgk@localhost) by troutmask.apl.washington.edu (8.16.1/8.16.1/Submit) id 1AT4aC9R082298; Sun, 28 Nov 2021 20:36:12 -0800 (PST) (envelope-from sgk) Date: Sun, 28 Nov 2021 20:36:12 -0800 From: Steve Kargl To: Ed Maste Cc: Jason Bacon , FreeBSD Hackers Subject: Re: Call for Foundation-supported Project Ideas Message-ID: <20211129043612.GA82224@troutmask.apl.washington.edu> References: <861r36xzpe.fsf@phe.ftfl.ca> <20211128220732.GA81140@troutmask.apl.washington.edu> <20211129003635.GA81568@troutmask.apl.washington.edu> List-Id: Technical discussions relating to FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-hackers List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-hackers@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 4J2Xby33kKz3sk4 X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; none X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[] X-ThisMailContainsUnwantedMimeParts: N On Sun, Nov 28, 2021 at 10:17:00PM -0500, Ed Maste wrote: > On Sun, 28 Nov 2021 at 19:37, Steve Kargl > wrote: > > > > It's certainly not the latest and greatest, > > CPU: Intel(R) Core(TM)2 Duo CPU T7250 @ 2.00GHz (1995.04-MHz K8-class CPU) > > If you're content to use a compiler from a package you can save a lot > of time by building with `CROSS_TOOLCHAIN=llvm13` and > `WITHOUT_TOOLCHAIN=yes`. Or, instead of WITHOUT_TOOLCHAIN perhaps > `WITHOUT_CLANG=yes`, `WITHOUT_LLD=yes` and `WITHOUT_LLDB=yes`. > > Cirrus-CI builds CROSS_TOOLCHAIN and WITHOUT_TOOLCHAIN to reduce build > time significantly, given that the vast majority of CI build/test runs > are not targeting compiler changes. And therein lies the rub. Cirrus-CI skirts the issue with the slowing down of builds, so developers don't see the problem. I suspect developers also tend to use ccache or meta_mode. Reported "buildworld times" are not really "buildworld times" but more like partial "buildworld times". Unfortunately, I've wasted a weekend trying to get an up-to-date to chase down what may be a bug in (1) how the kernel delivers signals to a thread; (2) a problem with libthr; or a problem with asynchronous IO in gfortran. My REAL buildworld will finish eventually, so I'l be able to look more closely at the issue. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103444 -- Steve