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08/06/2009 at 02:24AM PDT, ID: 24630754
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7.0

How find which process is causing heavy I/O bottol neck

Asked by fosiul01 in Red Hat Linux, CentOS, Linux

Hi

I was reading about Performance tunning from last couple of days!!

I got some experience about how how to find out where is the bottol neck by using ( vmstat,sar , mpstat and iostat report)

But  i am still in dark about which process is causing the I/O bottol neck.

Example  scenerio :

vmstat is showing wa is too high example 300 , that meants there is hight I/O transfer in the hardrive

and i can see from iostat command which partition and which hardrive has the  high I/O transfer , theoriticaly there is solving .

but what i want to know is: how will you find which process is cauing this high I/O transfer .
 
another example, if i do big transfer from a pc to a server [ 10 concurrent transfer with 1.3 GB at a time) "wa " in vmstart will go high and server will slow down. but here i know its because there is 10 sshd process running and those are causing I/O bottolneck

but suppose if  have lots of user and they are uploading and downloading from the server randomly,

now how will you know which process is responsible for high I/O ??

hope it does make sense .
[+][-]08/06/09 02:38 AM, ID: 25031450

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[+][-]08/06/09 03:14 AM, ID: 25031636

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[+][-]08/06/09 11:35 AM, ID: 25036579

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