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Old 02-04-2004, 05:46 PM   #1
biotek1
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CPU at 100% along with non stop hard disk activity


Hi,

I have had this problem for sometime now, all of a sudden , a lot of disk activity starts to take place (almost as if I were searching for a particular file, which I am not ) and this in turn causes the CPU to run @100% . This go's on for sometime , ultimately to the point where the fan on my laptop starts running on full blast to cool the cpu down as it is still runnning at 100% and my hard disk is going nuts. The only way to calm things down is to reboot , where afterwards everything just seems to idle like normal.

I am usinf EXT3 for the file system , I was wondering if it is doing some sort of journalising or indexing, and then just gets hung up in the process?

Anyone see anyting like this before?

Hardware:
dell inspiron 4150 laptop
40 GB toshiba HD
512MB DDR

Software:
Fedora Core 1
Running kernel-2.4.22-1.2149.nptl
 
Old 02-04-2004, 06:54 PM   #2
wapcaplet
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What process is eating the CPU? Type 'top' in a terminal window to see what's taking up your resources. It might be something you don't need and can shut down, or tell it to run with a lower priority.
 
Old 02-04-2004, 08:30 PM   #3
biotek1
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I am sorry I forgot to mention , that I always have system montior running. As soon as I see the signs of the cpu reaching 100% I check the process tab to see whats eating it up, and nothing!!! there is nothing listed there . When I say nothing, I mean there is no process listed taking up 100% of the cpu, everything seems normal .Thats whats so confusing. No process that is showing up to be consuming the cpu, hard drive activity thats borderinng insane, and a cpu @ 100% with a fan on at full speed. Only thing to do is reboot, then it calms down as if nothing ever happened.

Last edited by biotek1; 02-04-2004 at 08:32 PM.
 
Old 02-04-2004, 10:53 PM   #4
wapcaplet
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Er, no process at all? Does 'top' work, instead of the system monitor? If it shows something using CPU, it at least has to have a name or a process ID or something. If top doesn't do it, try 'ps', which can also show CPU usage, like this:

ps -eo "%C %c"

That'll show all process names and their CPU usage at the time of running ps.
 
Old 02-05-2004, 01:40 AM   #5
Lindy
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Sounds like it might be a cron job running. Does it occur at a regular time, top of the hour,
+30? Fedora will run prelink once a day, and it can take some time to do it..
 
Old 02-05-2004, 09:56 AM   #6
biotek1
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Hi thanks for the replies,

I also think it might be some scheduled job, or system task running. I am not familiar with "prelink", what is that service?

thanks.
 
Old 02-05-2004, 08:27 PM   #7
Lindy
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From the prelink man page:

DESCRIPTION
prelink is a program which modifies ELF shared libraries and ELF dynam-
ically linked binaries, so that the time which dynamic linker needs for
their relocation at startup significantly decreases and also due to
fewer relocations the run-time memory consumption decreases too (espe-
cially number of unshareable pages). Such prelinking information is
only used if all its dependant libraries have not changed since pre-
linking, otherwise programs are relocated normally.
 
  


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