Comments on: Understanding Linux Load Average – Part 2 http://prutser.wordpress.com/2012/05/05/understanding-linux-load-average-part-2/ By: Harald van Breederode Tue, 18 Jun 2013 17:39:13 +0000 hourly 1 http://wordpress.com/ By: Jenny http://prutser.wordpress.com/2012/05/05/understanding-linux-load-average-part-2/#comment-836 Wed, 01 May 2013 17:24:31 +0000 http://prutser.wordpress.com/?p=732#comment-836 Hi Harald,

This is very nice article to explain the Load average concept. Thanks for sharing this. But I have question that why on the load average of 4 the number of writing blocks are less than the one on load average of 2.

Thanks,

]]> By: Understanding Linux CPU Load 资料汇总 | 系统技术非业余研究 http://prutser.wordpress.com/2012/05/05/understanding-linux-load-average-part-2/#comment-822 Fri, 01 Mar 2013 07:54:22 +0000 http://prutser.wordpress.com/?p=732#comment-822 [...] Understanding Linux Load Average 谢谢 @jametong 参考：part1 part2 [...]

]]> By: Veritas Volume Manager (VxVM) command line examples | IT World http://prutser.wordpress.com/2012/05/05/understanding-linux-load-average-part-2/#comment-715 Mon, 16 Jul 2012 09:54:42 +0000 http://prutser.wordpress.com/?p=732#comment-715 [...] Understanding Linux Load Average – Part 2 [...]

]]> By: Raheel Syed http://prutser.wordpress.com/2012/05/05/understanding-linux-load-average-part-2/#comment-673 Tue, 15 May 2012 14:42:11 +0000 http://prutser.wordpress.com/?p=732#comment-673 Reblogged this on Raheel's Blog and commented:
Interesting series Part 2: Understanding Linux Load Average

]]> By: Harald van Breederode http://prutser.wordpress.com/2012/05/05/understanding-linux-load-average-part-2/#comment-665 Thu, 10 May 2012 11:46:15 +0000 http://prutser.wordpress.com/?p=732#comment-665 Hi Izzol,

Thanx for your constructive feedback …
-Harald

]]> By: izzol http://prutser.wordpress.com/2012/05/05/understanding-linux-load-average-part-2/#comment-664 Thu, 10 May 2012 08:17:54 +0000 http://prutser.wordpress.com/?p=732#comment-664 Because the Linux Scheduler is fuckup :) Try the same on FreBSD for example :)

]]> By: Harald van Breederode http://prutser.wordpress.com/2012/05/05/understanding-linux-load-average-part-2/#comment-658 Mon, 07 May 2012 08:42:37 +0000 http://prutser.wordpress.com/?p=732#comment-658 Hi Marco,

The dd processes generating the disk I/O are driven by a shell script similar to:
while :
dd of=file.$$ …
rm file.$$
done
So there are actually 4 processes involvedduring the first experiment, which explains why the run-queue utilization varies between 1 and 4.

]]> By: Admin http://prutser.wordpress.com/2012/05/05/understanding-linux-load-average-part-2/#comment-656 Sun, 06 May 2012 10:43:03 +0000 http://prutser.wordpress.com/?p=732#comment-656 Hi Harald,

Thanks for the nice topic. I have two findings. The first is that, while running only the two processes performing disk I/O, the sar output shows the runq-sz varying from 1 to 4. I should expect max 2 processes on the run queue.

The second is that, while running both the cpu and I/O bound scripts, the runq-sz is constantly on 4 processes on the run queue. So the I/O based processes seem to be on the run queue all the time

Best regards,
Marco

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