Date: Wed, 29 Jun 2011 23:56:01 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Manish Jain <invalid.pointer@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: PID 11 using 400% CPU Message-ID: <20110630045559.GD44024@dan.emsphone.com> In-Reply-To: <4E0BF66F.9080800@gmail.com> References: <4E0BF66F.9080800@gmail.com>
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In the last episode (Jun 30), Manish Jain said: > > Hello All, > I have a strange problem with my 8.1 box. After booting, the hard disk > goes into a full-speed never-ending spin. To see what disk I/O is being done, try running "ktrace -dip 0 ; sleep 10 ; ktrace -C", to capture all syscalls done on the entire system (pid 0 plus children) for 10 seconds, then run "kdump -m64 | less" to view the results. Look for read or write calls. > 'ps waux' always shows pid > 11 as taking 400% CPU utilization : > /root # ps -up 11 > USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME COMMAND > root 11 400.0 0.0 0 32 ?? RL 7:22PM 166:35.46 [idle] > I have tried multiple tweaks to resolve this - all to no effect. The As for this, what's to resolve? The idle process is a placeholder with one thread per CPU that accounts for time the CPU isn't doing any work. If you want to reduce it's "CPU use", run other CPU-intensive processes :) BTW, Windows has the same thing if you look at task manager; it's called "System Idle Process" there. -- Dan Nelson dnelson@allantgroup.com
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