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From: Subranshu Patel <spatel.ml@gmail.com>
To: xfs@oss.sgi.com
Subject: High %user CPU in XFS
Date: Sun, 17 Feb 2013 21:20:46 +0530	[thread overview]
Message-ID: <CAEUQcehy1fy5-W-TA--2emBgL3y9JskqRPCZf1ED5JDbPHqKTQ@mail.gmail.com> (raw)

 I created 2 filesystem on my system (RHEL 6.3, kernel 2.6.32) - XFS
and EXT4 and mounted them.

On both the filesystem I executed a program which performed the following:
- Create large number of directories
- Removing all the directories

During the execution of the program, I monitored the %user and %system
CPU usage (using sar command)

For EXT4 the %user was 1% and %system was 21%
For XFS the %user was 20% and %system was 52%

But I am not able to understand %user consumption, since %user reports
the CPU usage of the user level (application), shouldn't it be the
same for both EXT4 and XFS?

What are the factors that decide the %user component keeping in mind
that only the filesystem is different?

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             reply	other threads:[~2013-02-17 15:50 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-17 15:50 Subranshu Patel [this message]
2013-02-17 21:04 ` High %user CPU in XFS Tru Huynh
2013-02-17 21:29   ` Dave Chinner
2013-02-17 21:25 ` Dave Chinner
2013-02-18 14:17   ` Subranshu Patel

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