From: Eric Sandeen <sandeen@redhat.com>
To: "Theodore Ts'o" <tytso@mit.edu>,
Ext4 Developers List <linux-ext4@vger.kernel.org>
Subject: Re: [PATCH] resize2fs: radically reduce memory utilization by using rbtree bitmaps
Date: Fri, 25 Jul 2014 13:11:42 -0500 [thread overview]
Message-ID: <53D29DDE.805@redhat.com> (raw)
In-Reply-To: <1406310671-10784-1-git-send-email-tytso@mit.edu>
On 7/25/14, 12:51 PM, Theodore Ts'o wrote:
> When resizing an empty 21T file system to 28T, resize2fs was using
> this much CPU time and memory:
>
> 216.98user 19.77system 4:02.92elapsed 97%CPU (0avgtext+0avgdata 4485664maxresident)k
> 8inputs+1068680outputs (0major+800745minor)pagefaults 0swaps
>
> After this one-line change:
>
> 222.29user 0.49system 3:48.79elapsed 97%CPU (0avgtext+0avgdata 30080maxresident)k
> 8inputs+1068552outputs (0major+2497minor)pagefaults 0swaps
>
> An extra 14 seconds (+6%) of elapsed time to reduce the memory
> utilization from 4.2GB to 29MB seems like a fair trade. :-)
especially when it actually looks like 14 *fewer* seconds (-6%) ?
-Eric
next prev parent reply other threads:[~2014-07-25 18:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-25 17:51 [PATCH] resize2fs: radically reduce memory utilization by using rbtree bitmaps Theodore Ts'o
2014-07-25 18:11 ` Eric Sandeen [this message]
2014-07-25 18:14 ` Theodore Ts'o
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