hmm, thats a good tool, but its need kernel 2.6.20
and my kernel is 2.6.18, Upgrading kernel is not a solution!!!
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How find which process is causing heavy I/O bottol neck
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 .
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Answers
without the iotop tool your best bet is probably to send a -STOP signal to suspected processes and check the io rate when they idle. Then you can un-pause the process again with a -CONT signal.
Eg: If you suspect process 1234 to be the source of the IO:
$ kill -STOP 1234
Check if the io rate drops.. Then
$ kill -CONT 1234
Might end up in a lot of work if you have many suspected processes. You should suspect the processes that consumes only a little CPU, as IO always takes a lot of time. (Unless your applications is doing async io, but that's not very common.
i agree, till now iotop is the best solution .. but kernel problem.. but i will try this iotop with another kernel which i am installing in a test pc
but suspending process seems like not practical to me as you might suspended wrong process and some one might shout at you!!!
since i cant use iotop in every kernel which is less then 2.6.20 . so i need to come out with other solution....
at least if any one can tel me , what could be the theory behind this about how to find expensive I/O request..
one of my friends he sent me a link which is this :
http://dag.wieers.com/home
which is good but agian, how to find expensive I/O is in TODO list, so its not implemented yet...
so what the theory behind about how find expensive I/O request ??
Ok just tested iotop, its really good!!
but its kill your patiences to make its run. specialy with updated python and recompiling the kernel..
anway , i will just wait few more hourss to see if others has any solution or not
or even any one can help me to understand, if there is any way i meant by "do your self" way to figured it out which is expensives process for I/O bottol neck
@noci
your last comments is the best one. i really wanted to know , theoritically from where they collect this data, and as you mentioned
its /proc/*/io
about dstat, its a good tools, but i dont understand why they dont include this process finding in that one .!!It should not be that hard!!
Ok i am satisfied now, i will be able to take this one from here more further.
thanks for your help.
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by: nociPosted on 2009-08-06 at 02:38:09ID: 25031450
it does make sense and you need a tool called iotop.
You can find it here:
http://guichaz.free.fr/iot