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From: Bron Gondwana <brong@fastmail.fm>
To: Bron Gondwana <brong@fastmail.fm>
Cc: linux-btrfs@vger.kernel.org
Subject: Poor performance unlinking hard-linked files (repost)
Date: Tue, 16 Nov 2010 23:54:45 +1100	[thread overview]
Message-ID: <20101116125445.GA3229@brong.net> (raw)
In-Reply-To: <1289618724.28645.1405062363@webmail.messagingengine.com>

Just posting this again more neatly formatted and just the
'meat':

a) program creates piles of small temporary files, hard
   links them out to different directories, unlinks the
   originals.

b) filesystem size: ~ 300Gb (backed by hardware RAID5)

c) as the filesystem grows (currently about 30% full) 
   the unlink performance becomes horrible.  Watching
   iostat, there's a lot of reading going on as well.

Is this expected?  Is there anything we can do about it?
(short of rewrite Cyrus replication)

Thanks,

Bron.

  reply	other threads:[~2010-11-16 12:54 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-11-13  3:25 Poor performance unlinking hard-linked files Bron Gondwana
2010-11-16 12:54 ` Bron Gondwana [this message]
2010-11-16 13:38   ` Poor performance unlinking hard-linked files (repost) Chris Mason
2010-11-17  4:11     ` Bron Gondwana
2010-11-17  9:56       ` Bron Gondwana
2010-11-18 15:30       ` Chris Mason
2010-11-18 21:46         ` Bron Gondwana
2010-11-19 14:10           ` Chris Mason
2010-11-19 21:58             ` Bron Gondwana
2010-11-30  9:35               ` Bron Gondwana
2010-11-30 12:49                 ` Chris Mason
2010-11-30 23:24                   ` Bron Gondwana

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