From: Dave Horsfall <dave@horsfall.org>
To: The Eunuchs Hysterical Society <tuhs@tuhs.org>
Subject: Re: [TUHS] reboot(2) system call
Date: Sun, 31 Jan 2021 09:27:10 +1100 (EST) [thread overview]
Message-ID: <alpine.BSF.2.21.9999.2101310922250.36435@aneurin.horsfall.org> (raw)
In-Reply-To: <m1l4dtA-0036xBC@more.local>
On Tue, 26 Jan 2021, Greg A. Woods wrote:
> The lore I was told at the time was that you alwasy ran three and that
> it didn't matter if they were all on the same line with semicolons or
> not because of the very fact that the second one would block.
What I was taught was:
% sync
% sync
% sync
and never:
% sync; sync; sync
The theory was that by waiting for the shell prompt each time, it gave the
buffer pool enough time to be flushed.
> The third one was just for superstitious good luck, and just in case
> there was a process still running and writing to a filesystem.
Never heard that theory, but naturally you did a "ps ax" first, didn't
you?
-- Dave
next prev parent reply other threads:[~2021-01-30 22:27 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-27 18:57 Warner Losh
2020-07-28 0:36 ` Clem Cole
2020-07-28 4:06 ` Dave Horsfall
2020-07-28 16:35 ` Win Treese
2020-07-28 13:11 ` Jaap Akkerhuis
2021-01-27 6:01 ` Greg A. Woods
2021-01-30 22:27 ` Dave Horsfall [this message]
2021-01-30 22:31 ` Larry McVoy
2021-01-30 22:37 ` Warner Losh
2021-02-02 2:20 ` Greg A. Woods
2021-02-02 2:30 ` Warner Losh
2021-02-02 20:30 ` Greg A. Woods
2021-02-02 3:35 ` Dave Horsfall
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