Date: Wed, 22 Mar 2023 15:40:53 -0400 From: George Mitchell <george+freebsd@m5p.com> To: Mark Millard <marklmi@yahoo.com>, FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: Periodic rant about SCHED_ULE Message-ID: <952d9795-19dc-8ad1-bb75-5c556ca6795a@m5p.com> In-Reply-To: <6BD317F2-7EDD-45C0-9DC9-5B94C1BBB8E1@yahoo.com> References: <6BD317F2-7EDD-45C0-9DC9-5B94C1BBB8E1.ref@yahoo.com> <6BD317F2-7EDD-45C0-9DC9-5B94C1BBB8E1@yahoo.com>
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On 3/22/23 15:21, Mark Millard wrote: > George Mitchell <george+freebsd@m5p.com> wrote on > Date: Wed, 22 Mar 2023 17:36:39 UTC : > [...] >> Here are the very complicated instructions for reproducing the problem: >> 1. Install and start misc/dnetc from ports. > > Installing is likely easy, as likely would be building > with default options (if any). I know nothing about > starting misc/dnetc so that is research. (Possibly > trivial, although if it has alternatives to control > then I'd need to match that context too.) service dnetc start > >> 2. Run "make buildworld". > > So on the 32 hardware-thread (16 cores) amd64 machine that > I have access to, the test is to only have buildworld use > about one hardware thread, no matter what else is going on. > I never would have guessed that the steps would not involve > more like -j$(sysctl -n hw.ncpu) (so around -j32 in this > context). So it is good that you provided your note or > I'd not know if I'd done similarly or not when trying such. > > [Note: -j1 and lack of -j are not strictly equivalent in > how make operates. As I remember, the distinction makes > a notable difference in the number of subprocesses created > directly by make (one per action "line" vs. one for the > whole block?). So even using -j1 might make a difference > vs. what you specified. I'd have to test to see.] I am literally running "make buildworld" with no additional options. > >> Standard out conveniently reports how long it took (wall clock). > > But nothing in your instructions indicate about how > to get an idea much progress dnetc made during the > various tests? [...] Honestly, I've never worried about this part. But dnetc logs its progress in /usr/local/distributed.net/dnetc.txt, though not in terms that are easy to relate to real-world progress. Oddly, when I run "make buildworld," I'm primarily interested in getting the world built. Perhaps others feel differently. > [...] > FYI: I've never built with and run the alternate > scheduler so if there is any appropriate background > for that that would not be obvious on finding basic > instructions, it would be appropriate to provide > such notes. > [...] You have to build a new kernel, using a config file in which you have replaced "options SCHED_ULE" with "options SCHED_4BSD". -- George
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