From: Miklos Szeredi <miklos@szeredi.hu>
To: David Howells <dhowells@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Al Viro <viro@zeniv.linux.org.uk>,
dray@redhat.com, Karel Zak <kzak@redhat.com>,
Miklos Szeredi <mszeredi@redhat.com>,
Steven Whitehouse <swhiteho@redhat.com>,
Jeff Layton <jlayton@redhat.com>, Ian Kent <raven@themaw.net>,
andres@anarazel.de,
Christian Brauner <christian.brauner@ubuntu.com>,
Lennart Poettering <mzxreary@0pointer.de>,
keyrings@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: Upcoming: Notifications, FS notifications and fsinfo()
Date: Tue, 31 Mar 2020 19:42:48 +0000 [thread overview]
Message-ID: <CAJfpegtn1A=dL9VZJQ2GRWsOiP+YSs-4ezE9YgEYNmb-AF0OLA@mail.gmail.com> (raw)
In-Reply-To: <2294742.1585675875@warthog.procyon.org.uk>
On Tue, Mar 31, 2020 at 7:31 PM David Howells <dhowells@redhat.com> wrote:
>
> Miklos Szeredi <miklos@szeredi.hu> wrote:
>
> > The basic problem in my view, is that the performance requirement of a
> > "get filesystem information" type of API just does not warrant a
> > binary coded interface. I've said this a number of times, but it fell
> > on deaf ears.
>
> It hasn't so fallen, but don't necessarily agree with you. Let's pin some
> numbers on this.
Cool, thanks for testing. Unfortunately the test-fsinfo-perf.c file
didn't make it into the patch. Can you please refresh and resend?
> Okay, the results:
>
> For 1000 mounts, f= 1514us f2= 1102us p= 6014us p2= 6935us; p=4.0*f p=5.5*f2 p=0.9*p2
> For 2000 mounts, f= 4712us f2= 3675us p= 20937us p2= 22878us; p=4.4*f p=5.7*f2 p=0.9*p2
> For 3000 mounts, f= 6795us f2= 5304us p= 31080us p2= 34056us; p=4.6*f p=5.9*f2 p=0.9*p2
> For 4000 mounts, f= 9291us f2= 7434us p= 40723us p2= 46479us; p=4.4*f p=5.5*f2 p=0.9*p2
> For 5000 mounts, f\x11423us f2= 9219us p= 50878us p2= 58857us; p=4.5*f p=5.5*f2 p=0.9*p2
> For 10000 mounts, f"899us f2\x18240us p\x101054us p2\x117273us; p=4.4*f p=5.5*f2 p=0.9*p2
> For 20000 mounts, fE811us f27211us p 3640us p2#7377us; p=4.4*f p=5.5*f2 p=0.9*p2
> For 30000 mounts, fi703us f2T800us p06778us p257629us; p=4.4*f p=5.6*f2 p=0.9*p2
So even the p2 method will give at least 80k queries/s, which is quite
good, considering that the need to rescan the complete mount tree
should be exceedingly rare (and in case it mattered, could be
optimized by priming from /proc/self/mountinfo).
Thanks,
Miklos
next prev parent reply other threads:[~2020-03-31 19:42 UTC|newest]
Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-30 13:58 Upcoming: Notifications, FS notifications and fsinfo() David Howells
2020-03-30 14:31 ` [GIT PULL] General notification queue and key notifications David Howells
2020-03-31 6:51 ` Stephen Rothwell
2020-06-02 15:55 ` David Howells
2020-06-03 2:15 ` Ian Kent
2020-06-08 0:49 ` Ian Kent
2020-06-10 9:56 ` Christian Brauner
2020-06-10 11:12 ` Karel Zak
2020-06-12 21:32 ` Linus Torvalds
2020-06-12 22:01 ` Linus Torvalds
2020-06-13 13:04 ` David Howells
2020-06-13 16:47 ` Linus Torvalds
2020-06-13 17:03 ` Linus Torvalds
2020-06-13 19:22 ` Miklos Szeredi
2020-06-13 13:24 ` David Howells
2020-06-13 18:00 ` pr-tracker-bot
2020-06-17 1:15 ` Williams, Dan J
2020-06-23 23:38 ` Dan Williams
2020-06-24 0:55 ` David Howells
2020-06-24 1:03 ` Dan Williams
2020-06-24 1:17 ` David Howells
2020-03-30 14:36 ` [GIT PULL] Mount and superblock notifications David Howells
2020-04-04 21:13 ` Linus Torvalds
2020-04-05 22:52 ` Andres Freund
2020-03-30 14:43 ` [GIT PULL] fsinfo: Filesystem information query David Howells
2020-03-30 20:28 ` Upcoming: Notifications, FS notifications and fsinfo() Miklos Szeredi
2020-03-31 9:21 ` Karel Zak
2020-03-30 21:17 ` Christian Brauner
2020-03-31 5:11 ` Miklos Szeredi
2020-03-31 8:15 ` Christian Brauner
2020-03-31 8:34 ` Miklos Szeredi
2020-03-31 8:34 ` Karel Zak
2020-03-31 8:56 ` Miklos Szeredi
2020-03-31 9:49 ` Karel Zak
2020-03-31 12:25 ` Lennart Poettering
2020-03-31 15:10 ` Miklos Szeredi
2020-03-31 15:24 ` Lennart Poettering
2020-03-31 21:56 ` David Howells
2020-03-31 21:54 ` David Howells
2020-04-01 8:43 ` Karel Zak
2020-03-31 7:22 ` Lennart Poettering
2020-03-31 17:31 ` David Howells
2020-03-31 19:42 ` Miklos Szeredi [this message]
2020-03-31 19:47 ` David Howells
2020-03-31 21:14 ` David Howells
2020-03-31 21:23 ` David Howells
2020-03-31 21:52 ` David Howells
2020-04-01 9:04 ` Karel Zak
2020-04-01 13:34 ` Miklos Szeredi
2020-04-01 13:55 ` David Howells
2020-04-01 13:58 ` David Howells
2020-04-01 15:25 ` Miklos Szeredi
2020-04-03 9:11 ` Karel Zak
2020-04-01 16:01 ` David Howells
2020-04-01 16:30 ` Miklos Szeredi
2020-04-02 15:22 ` David Howells
2020-04-02 15:24 ` Miklos Szeredi
2020-04-02 15:42 ` David Howells
2020-04-02 15:24 ` David Howells
2020-04-01 14:41 ` Lennart Poettering
2020-04-01 15:33 ` Miklos Szeredi
2020-04-01 16:06 ` David Howells
2020-04-01 16:40 ` Miklos Szeredi
2020-04-02 2:52 ` Ian Kent
2020-04-02 13:52 ` Miklos Szeredi
2020-04-02 14:36 ` Lennart Poettering
2020-04-02 15:22 ` Miklos Szeredi
2020-04-02 15:28 ` Lennart Poettering
2020-04-02 15:35 ` Miklos Szeredi
2020-04-02 15:50 ` Lennart Poettering
2020-04-02 17:20 ` Miklos Szeredi
2020-04-03 11:08 ` Lennart Poettering
2020-04-03 11:48 ` Miklos Szeredi
2020-04-03 15:01 ` Lennart Poettering
2020-04-06 9:22 ` Miklos Szeredi
2020-04-06 17:29 ` Lennart Poettering
2020-04-07 2:21 ` Ian Kent
2020-04-07 13:59 ` Miklos Szeredi
2020-04-07 15:53 ` Lennart Poettering
2020-04-07 16:06 ` Miklos Szeredi
2020-04-02 15:51 ` David Howells
2020-04-02 15:56 ` David Howells
2020-04-03 1:44 ` Ian Kent
2020-04-03 11:11 ` Lennart Poettering
2020-04-03 11:38 ` Miklos Szeredi
2020-04-03 12:05 ` Richard Weinberger
2020-04-03 15:12 ` Lennart Poettering
2020-04-03 20:30 ` J. Bruce Fields
2020-04-06 8:35 ` Miklos Szeredi
2020-04-06 16:07 ` J. Bruce Fields
2020-04-06 9:17 ` Karel Zak
2020-04-06 16:34 ` Linus Torvalds
2020-04-06 18:46 ` J. Bruce Fields
2020-04-06 18:48 ` Lennart Poettering
2020-04-08 3:36 ` Linus Torvalds
2020-04-03 15:36 ` David Howells
2020-04-03 15:41 ` Lennart Poettering
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