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From: Qiantan Hong <qhong@mit.edu>
To: "emacs-devel@gnu.org" <emacs-devel@gnu.org>
Subject: Question: estimating size of a buffer when written to file?
Date: Wed, 8 Dec 2021 15:33:06 +0000	[thread overview]
Message-ID: <3703D806-12C4-4EE6-ADB8-8A006D7AFC35@mit.edu> (raw)

Is there any reliable way to get (or conservatively estimate) 
the size of a buffer when written to file?

I’m thinking about using it for an optimization for persistent kv store.
If we know a log entry, when written out, is shorter than PIPE_BUF,
then we can skip the file locking/unlocking.
Emacs lock file doesn’t seem to be particularly fast.

Best,
Qiantan


             reply	other threads:[~2021-12-08 15:33 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-08 15:33 Qiantan Hong [this message]
2021-12-08 15:52 ` Question: estimating size of a buffer when written to file? Stephen Berman
2021-12-08 15:55   ` Qiantan Hong
2021-12-08 16:01     ` Stephen Berman
2021-12-08 16:29       ` Daniel Martín
2021-12-08 17:03 ` Stefan Monnier
2021-12-08 17:09   ` Qiantan Hong

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