Date: Fri, 5 Apr 2013 09:44:08 +0200 From: Erik Cederstrand <erik@cederstrand.it> To: Alfred Perlstein <bright@mu.org> Cc: arch@FreeBSD.org, Gleb Smirnoff <glebius@FreeBSD.org> Subject: Re: [CFR][CFT] counter(9): new API for faster and raceless counters Message-ID: <D3A7ED36-A92F-4F9B-917A-F223D955CC43@cederstrand.it> In-Reply-To: <515DFF05.10206@mu.org> References: <20130401115128.GZ76816@FreeBSD.org> <20130402232606.GC1810@garage.freebsd.pl> <20130403002523.GA96431@in-addr.com> <20130404090851.GA1335@garage.freebsd.pl> <515DFF05.10206@mu.org>
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Den 05/04/2013 kl. 00.30 skrev Alfred Perlstein <bright@mu.org>: > On 4/4/13 2:08 AM, Pawel Jakub Dawidek wrote: >> XML is no go for me, as it is not really easy to use in scripts. >> We would need to create a tool to parse it and then I'd much prefer = to >> import my API for dealing with name/value pairs that could be used in = so >> many more places. >>=20 > Do you have a link to this format? >=20 > I'm looking at YAML and it's interesting, although I'm not sure if a = more abbreviated format wouldn't be better. >=20 > What I'm currently using is like: >=20 > date|vfs.freebuffers:5000|vfs.highbuffers: 343433|...| If you want to implement of machine-parseable output of sysctl that = supports key-value output, then please use a generally-accepted format. = This would make it so much easier for third-party software to use the = output. YAML or JSON are obvious choices. Powershell from Microsoft solves this generally by having all tools pipe = output as objects with a well-defined contract to the next command. = Whatever is printed to stdout is just human-friendly output. It's nice = because you can skip a lot of grep/sed/awk/cut trickery and just filter = and pick fields in a more object-oriented way. But it's also a PITA = because what's printed to the terminal is not what's piped to the next = command, so you need to look up the object spec every time you add a = pipe. I think it would be going overboard to add a --yaml or --json flag to = every single userland tool in FreeBSD, but designing key-value output = for sysctl so it can be applied to other tools would be really nice. Thanks, Erik
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