How does credit_2 scheduler weighting work?

How does credit_2 scheduler weighting work?

[Adel Amani]

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 Hello
I am Adel Amani from university of Isfehan. I am interested in cooperation in xen. I will improve in scheduler of xen but I dont know where I can change the wight in scheduler credit_2!!! please help me.
Thanks
 
Adel Amani
M.Sc. Candidate@Computer Engineering Department, University of Isfahan
Email: A.Amani@eng.ui.ac.ir

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Re: How does credit_2 scheduler weighting work?

[George Dunlap]

On Mon, Sep 23, 2013 at 3:06 PM, Adel Amani <adel.amani66@yahoo.com> wrote:
>  Hello
> I am Adel Amani from university of Isfehan. I am interested in cooperation
> in xen. I will improve in scheduler of xen but I dont know where I can
> change the wight in scheduler credit_2!!! please help me.

Look, you've now posted basically the same question on a number of
different places: on the Xen UserVoice page, on someone's G+ profile,
and even mailed people individually.  Anything other than posting to
the xen-devel list was inappropriate behavior.  It's not our job to
help you with your project and hold your hand.  If you can't read the
xl man page or do a Google search to figure out how to set the weight,
why do you expect us to think you're going to be able to improve the
scheduler -- one of the most complicated and difficult parts of Xen?

Try reading this page and see if it helps you.

http://wiki.xen.org/wiki/Asking_Xen_Devel_Questions

 -George

Re: How does credit_2 scheduler weighting work?

[George Dunlap]

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On 25/09/13 11:34, Adel Amani wrote:
> yes, you have right and I have apology of you and associate :-( .... 
> it was a inappropriate :-( ..... I'm very sorry
> Maybe because I was nobody answers ..... I had seen this page but 
> can't help me.
> you write code Credit_2, can you help me this field? (please)

1.  Don't e-mail privately. Keep xen-devel in the cc.

2. I will be happy to answer any questions that are:
  a. Specific
  b. Are not easily found in the man pages or using Google.

  -George


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Re: How does credit_2 scheduler weighting work?

[Adel Amani]

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Ok,  I intend change weight in per period of algorithm Credit_2 by formula myself, But I don't know where change !! I read code Credit_2 But yet I'm not sure where change :-( ... then I should change code algorithm for improve Credit_2 ... 

are you know where should change??


 
Adel Amani
M.Sc. Candidate@Computer Engineering Department, University of Isfahan
Email: A.Amani@eng.ui.ac.ir


________________________________

1.  Don't e-mail privately. Keep xen-devel in the cc.

2. I will be happy to answer any questions that are:
 a. Specific
 b. Are not easily found in the man pages or using Google.

 -George

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Re: How does credit_2 scheduler weighting work?

[George Dunlap]

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On 25/09/13 12:29, Adel Amani wrote:
> Ok, I intend change weight in per period of algorithm Credit_2 by 
> formula myself, But I don't know where change !! I read code Credit_2 
> But yet I'm not sure where change :-( ... then I should change code 
> algorithm for improve Credit_2 ...
> are you know where should change??

That's still nowhere near specific enough.

I'm sorry to be blunt, but if that's the best question you can ask, then 
either you haven't really made an effort to come to grips with the code 
yourself, or you've made the effort and are still completely lost.  If 
you haven't made the effort, there's no reason for me to make an 
effort.  And if you have made the effort and are still this lost, I'm 
afraid there's not much I can do for you.

  -George

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Re: How does credit_2 scheduler weighting work?

[Adel Amani]

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:-| ..... please you tell me, what mean's of "specific" ??
I don't know really :-| ..... please you tell me one example of  "specific" , to I ask of you .....
thanks

 
Adel Amani
M.Sc. Candidate@Computer Engineering Department, University of Isfahan
Email: A.Amani@eng.ui.ac.ir


________________________________

That's still nowhere near specific enough.

I'm sorry to be blunt, but if that's the best question you can ask,
    then either you haven't really made an effort to come to grips with
    the code yourself, or you've made the effort and are still
    completely lost.  If you haven't made the effort, there's no reason
    for me to make an effort.  And if you have made the effort and are
    still this lost, I'm afraid there's not much I can do for you.

 -George

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Re: How does credit_2 scheduler weighting work?

[Adel Amani]

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:-| ..... please you tell me, what mean's of "specific" ??
I don't know really :-| ..... please you tell me one example of  "specific" to I ask of you .....
thanks

 
Adel Amani
M.Sc. Candidate@Computer Engineering Department, University of Isfahan
Email: A.Amani@eng.ui.ac.ir


________________________________

That's still nowhere near specific enough.

I'm sorry to be blunt, but if that's the best question you can ask,
    then either you haven't really made an effort to come to grips with
    the code yourself, or you've made the effort and are still
    completely lost.  If you haven't made the effort, there's no reason
    for me to make an effort.  And if you have made the effort and are
    still this lost, I'm afraid there's not much I can do for you.

 -George

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Re: How does credit_2 scheduler weighting work?

[Ian Campbell]

On Wed, 2013-09-25 at 07:24 -0700, Adel Amani wrote:
> :-| ..... please you tell me, what mean's of "specific" ??
> I don't know really :-| ..... please you tell me one example of
> "specific" to I ask of you .....
> thanks

I suggest you speak to your M.Sc. advisor. They should be able to give
you this sort of guidance.

Ian.

Re: How does credit_2 scheduler weighting work?

[Adel Amani]

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Unfortunately nobody can help me here; I want to set weight in per period of migration. I don't know which function must be changed in changing weight and percent of PCPU to VMs.
which function must be changed? 

function "burn_credits(...)" or "csched_dom_cntl(...)" or "csched_runtime(...)" or "csched_schedule(...)" ??!

 
Adel Amani
M.Sc. Candidate@Computer Engineering Department, University of Isfahan
Email: A.Amani@eng.ui.ac.ir


________________________________

I suggest you speak to your M.Sc. advisor. They should be able to give
you this sort of guidance.

Ian.

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Re: How does credit_2 scheduler weighting work?

[Dario Faggioli]

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On mer, 2013-09-25 at 09:26 -0700, Adel Amani wrote:
> Unfortunately nobody can help me here; I want to set weight in per
> period of migration. 
>
What's your final goal? What's wrong with the current "weight in per
period of migration"? How do you want to change the "weight in per
period of migration"? Why and under what circumstances do you think
changing "weight in per period of migration" would help?

IOW, what is the issue that you are seeing and how do you think your
solution of "weight in per period of migration" could solve/improve the
situation?

Actually, what's the exact meaning of "weight in per period of
migration"? It might be because I'm not a native English speaker, but I
honestly can't understand what such selection of words means applied to
the credit(2) scheduler...

Answering the above question will give us a lot of context about what is
it that you are up to, which is a great deal (or at least a step in the
proper direction) of George's (and others) "be specific". :-)

Regards,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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Re: How does credit_2 scheduler weighting work?

[Adel Amani]

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Hello Mr Faggioli
I read this article: "Optimizing the live migration of virtual machine by CPU scheduling".In this article weight was changed and the result was better. Now I want to do this article and make it better.
I don't know which credit (Credit or Credit2) is used in this article.
 would you please help me?
 
Adel Amani
M.Sc. Candidate@Computer Engineering Department, University of Isfahan
Email: A.Amani@eng.ui.ac.ir


________________________________
 

What's your final goal? What's wrong with the current "weight in per
period of migration"? How do you want to change the "weight in per
period of migration"? Why and under what circumstances do you think
changing "weight in per period of migration" would help?

IOW, what is the issue that you are seeing and how do you think your
solution of "weight in per period of migration" could solve/improve the
situation?

Actually, what's the exact meaning of "weight in per period of
migration"? It might be because I'm not a native English speaker, but I
honestly can't understand what such selection of words means applied to
the credit(2) scheduler...

Answering the above question will give us a lot of context about what is
it that you are up to, which is a great deal (or at least a step in the
proper direction) of George's (and others) "be specific". :-)

Regards,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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