From: Anand Jain <Anand.Jain@oracle.com>
To: Andrew Guertin <andrew.guertin@uvm.edu>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: Applications using fsync cause hangs for several seconds every few minutes
Date: Fri, 19 Aug 2011 17:58:51 +0800 [thread overview]
Message-ID: <4E4E33DB.6010209@oracle.com> (raw)
In-Reply-To: <4E4CFB53.1020208@uvm.edu>
Andrew,
Facing some challenges to test this. If you have a chance to test
it again, the following output will be interesting to observe.
iostat -ctx -p sda 3 > /tmp/iostat.out
Also note your system time when this problem occurs, (iostat has time
stamp, I wish see the waitQ and activeQ at that time, hopefully
captured in the file /tmp/iostat.out above).
We need more clarity on the test-case which can reproduce this issue.
As I know you are writing into the btrfs. However is that a large
number of small files (you are creating new files) OR you are writing
a few large new files ?
If there is any script to test this that will make understanding
a lot easier.
PS: Does anybody know Solaris lockstat(1M) equivalent in Linux ?
Thanks, Anand
next prev parent reply other threads:[~2011-08-19 9:58 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-09 21:29 Applications using fsync cause hangs for several seconds every few minutes Andrew Guertin
2011-08-12 1:13 ` Andrew Guertin
2011-08-18 14:38 ` Chris Mason
2011-08-20 17:18 ` Andrew Guertin
2011-08-17 14:24 ` Andrew Guertin
2011-08-17 14:29 ` Michael Cronenworth
2011-08-17 14:38 ` Andrew Guertin
2011-08-17 14:55 ` Dave
2011-08-18 2:41 ` Anand Jain
2011-08-18 6:44 ` youagree
2011-08-18 7:29 ` Andrew Guertin
2011-08-18 7:55 ` youagree
2011-08-18 11:45 ` Andrew Guertin
2011-08-19 9:58 ` Anand Jain [this message]
2011-08-18 7:41 ` Andrew Guertin
2011-08-18 6:47 ` Chris Samuel
2011-08-18 6:58 ` youagree
2011-08-19 7:34 ` Chris Samuel
-- strict thread matches above, loose matches on Subject: below --
2011-06-21 11:15 Jan Stilow
2011-06-06 22:58 Nirbheek Chauhan
2011-07-18 17:37 ` Mck
2011-07-18 18:17 ` Josef Bacik
2011-07-20 20:59 ` Nirbheek Chauhan
2011-08-03 15:50 ` mck
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