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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

  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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