From: Russ Cox <rsc@swtch.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] Killing venti
Date: Thu, 5 Jan 2012 14:12:54 -0500 [thread overview]
Message-ID: <CADSkJJX_31dZkEWDPXUN7V-tzPgq-TrgW9MBF1fUmVM4Y9ymqw@mail.gmail.com> (raw)
In-Reply-To: <86wr96vyql.fsf@cmarib.ramside>
On Thu, Jan 5, 2012 at 12:35 PM, <smiley@icebubble.org> wrote:
>> run venti/sync.
>
> Ah. Cool. Gotta love those undocumented commands. :) While probing
> the distal edges of Venti's documented functionality, I also came across
> the following, which have similar (but not identical) effect:
>
> hget http://$vthost:$vtwebport/flushicache
> hget http://$vthost:$vtwebport/flushdcache
>
> These HTTP requests initiate flushes of the index and arena block
> caches, respectively, and don't return a response until the respective
> flush is complete.
Honestly, you don't even have to run venti/sync.
Every command that writes to venti ends by doing
a sync.
You probably don't want to use those hget commands.
They are safe, of course, but it is equally safe not to
run them. The icache in particular can take a long time to
flush, and venti will recover the entries (in less time than
the flush would have taken) the next time it starts.
Russ
prev parent reply other threads:[~2012-01-05 19:12 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-03 17:21 smiley
2012-01-03 17:30 ` Russ Cox
2012-01-05 17:35 ` smiley
2012-01-05 18:21 ` David du Colombier
2012-01-06 17:20 ` smiley
2012-01-05 19:12 ` Russ Cox [this message]
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