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Old 11-07-2005, 05:56 AM   #1
rubella
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monitor I/O


hay all! I'm looking for a tool which monitors all I/O operations. I have a lot of diskactivity and i don't know where it come from. something like 'top' or ... thx!
 
Old 11-08-2005, 01:02 AM   #2
chrism01
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man top: use 'f' interactively to activate columns; choose u=> page fault, v => dirty pages cnt.
Also try fuser -u -m <somefilepath> and also look at lsof cmd.
HTH
 
Old 11-08-2005, 08:01 AM   #3
rubella
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what means page fault and dirty pages? I've read man pages but ... i don't get it out.
 
Old 11-08-2005, 08:46 AM   #4
Emmanuel_uk
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maybe lsof
will help you to track some processes and files as well
 
Old 11-09-2005, 02:02 AM   #5
chrism01
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Brief explanation:

A page fault is when the requested page of mem is not avail in RAM and has to be paged in (copied) from disk.
The system only keeps enough bits of various progs in RAM to keep going.
This is usually less than the sum total size of all progs (& data) needed.
Hence the rest is left on disk or stored in the special swap partition (temp extension of RAM addresses on disk).
You should google up an explanation if you really want to know about I/O, virtual mem etc.
Search for virtual memory, swap space/partitions in Linux.
 
  


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