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IDS Forum

RE: CPU load balancing - Tru64

Posted By: Dirk Cornelis Moolman [ MTN - Innovation Centre ]
Date: Thursday, 1 September 2011, at 7:45 a.m.

In Response To: Re: CPU load balancing - Tru64 (Fernando Nunes)

Correct, the database is remote, on another server. We have other application servers also connecting to the same database, and those applications seem to be fine when this team starts complaining about this specific server.

I am not sure about the front end (screen), but they monitor by number of records (customers) processed. This process has existed for years, so they go on their averages for the previous runs, and this is how they identify that the server becomes slow (by comparing to previous runs).
PS. All written in 4GL (it is not GUI).

It runs in batch form, in the sense of it will process a range of customers in the database (generate invoices).

Yes, we log in, and from our point of view the server is ok in terms of memory, io, cpu ...... for example 85% or more idle time, etc. But they complain that it is slow. The problem seems to be localised to this server.

> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
> Fernando Nunes
> Sent: Thursday, 01 September 2011 12:49 PM
> To: ids@iiug.org
> Subject: Re: CPU load balancing - Tru64 [24821]
>
> Questions:
> 1- Are these processes interactive?
> 2- Why they say it's slow? If it's a GUI program are they seeing slow
> response? If it's a batch program do they have any progress indication?
> 3- At that time does the server have free resources (CPU, memory, I/O)?
> Assuming yes, can't they be confusing "server slow" with "slow database
> response"?
> 4- I suppose the database is not local, correct?
>
> Regards.

> On Thu, Sep 1, 2011 at 10:26 AM, Dirk Cornel....
> <moolma_dc@mtn.co.za>wrote:
>
> > I have some doubts - let me explain. The server in general runs ok,
> until
> > it
> > is time for our .... let's call them, Invoice Runs.
> >
> > So we have a team of people who do this. They start an invoice run,
> and
> > after
> > 2 or 3 hours they phone us and complain that the server is slow. So
> the
> > processes they started, are new (fresh) processes (4ge's).
> >
> > Could it still be ageing (on a Unix level perhaps) - something more
> > technical
> > I am missing with regards to ageing ?
> >
> > Dirk
> >
> > > -----Original Message-----
> > > From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf
> Of
> > > Art Kagel
> > > Sent: Wednesday, 31 August 2011 03:43 PM
> > > To: ids@iiug.org
> > > Subject: Re: CPU load balancing - Tru64 [24789]
> > >
> > > This sounds like a process aging problem. TRU64 may be aggressive
> about
> > > reducing the run time priority of long running processes. Your app
> > > server
> > > applications sound like they start up and keep running forever
> which
> > > would
> > > bring them to the attention of the OS's priority aging algorithms.
> One
> > > of
> > > the results of this aging is that long running processes get fewer
> time
> > > slices that are longer then younger processes. This will manifest
> as a
> > > process that seems to stay on a single CPU/core for a long time
> before
> > > migrating to another CPU. This will definitely result in pegging
> that
> > > CPU
> > > to near 100% if the process does not have to wait for IO very
> often.
> > >
> > > Art
> > >
> > > Art S. Kagel
> > > Advanced DataTools (www.advancedatatools.com)
> > > Blog: http://informix-myview.blogspot.com/
> > >
> > > Disclaimer: Please keep in mind that my own opinions are my own
> > > opinions and
> > > do not reflect on my employer, Advanced DataTools, the IIUG, nor
> any
> > > other
> > > organization with which I am associated either explicitly,
> implicitly,
> > > or by
> > > inference. Neither do those opinions reflect those of other
> individuals
> > > affiliated with any entity with which I am affiliated nor those of
> the
> > > entities themselves.
> >
> > > On Wed, Aug 31, 2011 at 6:17 AM, Dirk Cornel....
> > > <moolma_dc@mtn.co.za>wrote:
> > >
> > > > > -----Original Message-----
> > > > > From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On
> Behalf
> > > Of
> > > > > Obnoxio The Clown
> > > > > Sent: Wednesday, 31 August 2011 12:02 PM
> > > > > To: ids@iiug.org
> > > > > Subject: Re: CPU load balancing - Tru64 [24783]
> > > > >
> > > > > On 31/08/2011 10:56, Dirk Cornel.... wrote:
> > > > > > " I've seen machines that have slow response, although the
> CPU
> > > usage
> > > > > is low"
> > > > > >
> > > > > > Yes, this is what we are experiencing. So my first check were
> the
> > > > > cpu's. I
> > > > > > also looked at I/O (the I/O was good, no problems there), and
> the
> > > > > memory was
> > > > > > good (no swapping taking place on the server).
> > > > > >
> > > > > > So now I start to wonder, is this an inherent problem on
> Tru64
> > > > > perhaps ?
> > > > > .....
> > > > > > the cpu's not load balancing properly ?
> > > > > >
> > > > > > There could be many valid explanations. This server does not
> only
> > > run
> > > > > > Informix. Maybe a process binds to a cpu, and cannot be split
> > > > > further, into
> > > > > > multiple threads for multiple cpu's to be utilised.
> > > > >
> > > > > What does onstat -C show?
> > > > >
> > > > > --
> > > > > Cheers,
> > > > > Obnoxio The Clown
> > > >
> > > > The problem is, this is an Apps server - it only runs 4ge's, and
> Java
> > > > applications - no database. And all the other servers are fine.
> So I
> > > think
> > > > the
> > > > problem is limited to this server.
> > > >
> > > > More frustrating is, the server would show 85% plus idle time,
> but
> > > they are
> > > > complaining it is slow. We reboot only this server, and
> everything is
> > > fine
> > > > again.
> > > > This is why I started digging into processes now, seeing which
> are
> > > using
> > > > the
> > > > most memory on this server, etc.
> > > >
> > > > The CPU scenario I described, is also strange to me. What if the
> > > process of
> > > > the user that is complaining, is running on one of the cpu's that
> are
> > > busy,
> > > > while the server in general still has idle time ?
> > > >
> > > > NOTE: This e-mail message is subject to the MTN Group disclaimer
> see
> > > > http://www.mtn.co.za/SUPPORT/LEGAL/Pages/EmailDisclaimer.aspx
> > > >
> > > >
> > > >
> > > >
> > >
> ***********************************************************************
> > > ********
> > > > Forum Note: Use "Reply" to post a response in the discussion
> forum.
> > > >
> > > >
> > >
> > > --002215974c5e4e6cc304abcd4d35
> > >
> > >
> > >
> ***********************************************************************
> > > ********
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> > NOTE: This e-mail message is subject to the MTN Group disclaimer see
> > http://www.mtn.co.za/SUPPORT/LEGAL/Pages/EmailDisclaimer.aspx
> >
> >
> >
> >
> ***********************************************************************
> ********
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> >
>
> --
> Fernando Nunes
> Portugal
>
> http://informix-technology.blogspot.com
> My email works... but I don't check it frequently...
>
> --002215b034662db86904abdefc1e
>
>
> ***********************************************************************
> ********
> Forum Note: Use "Reply" to post a response in the discussion forum.

NOTE: This e-mail message is subject to the MTN Group disclaimer see http://www.mtn.co.za/SUPPORT/LEGAL/Pages/EmailDisclaimer.aspx

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