Trying to understand Magma performance

[Bart Gauquie]

Hi Chris,

You are correct that 340 msecs is fast enough a reply of a web page. I was
reasoning that if a single user already takes 340 msec, a medium load would
be a lot slower.

I'd actually rather have scalability over raw speed. The systems I've been
using so far have high raw speed, and no scalability: it just gets slower
and slower under load.

I will do a test if it scales enough for my requirements, and experiment
with the high availability options.

Kind regards,

Bart

On Thu, Nov 19, 2009 at 7:24 PM, Chris Muller <asqueaker at gmail.com> wrote:

> Hi Bart,
>
> > To my opinion, 340 msecs not at all that great a performance.
>
> One-third of one second is fast enough web page response isn't it?
> I'm patient enough to accept pauses up to one entire second as long as
> the software is doing a lot of work for me.  Many, many web pages out
> on the net don't respond within 340 msecs.
>
> Which makes me wonder whether your concern is actually about scale.
> Magma is stronger in scalability than in raw speed.  The benchmark you
> referred to is an indicator of Magma's speed, not its scalability.
>
> Regards,
>   Chris
>
>
>
> On Tue, Nov 17, 2009 at 3:21 PM, Bart Gauquie <bart.gauquie at gmail.com>
> wrote:
> > Hi all,
> >
> > I'm experimenting with Magma. See at:
> > http://www.squeaksource.com/BkbagMagmaTesting/.
> > Its just a very simple app which has basically an orderedcollection of
> > todo's and an ordered collection of users. (each with 4 fields on it).
> > The transparancy of Magma, is something i like very much.
> > However, i'm also trying out the levels of performance Magma can offer.
> > If i add 50 todo's and 25 users and i print them in a seaside application
> it
> > takes about 350 msecs to render the page. If i render the same page with
> an
> > in memory version the same request takes about 10 msecs to render the
> page;
> > which is a 340 msec overhead in magma.
> > I have a 2.86 quadcore and i'm running locally 2 images. One with the
> > database server in it; one with the seaside client application. The
> client
> > application creates one magma mession for each seaside session.
> > To my opinion, 340 msecs not at all that great a performance. But I'm not
> > sure what i can expect of the magma performance, and if i have configured
> it
> > correctly. Is this kind of overhead normal? Because if i read the
> > http://wiki.squeak.org/squeak/5606 performance page, i find that under
> > Remote baseline (loopback address to same computer = no network latency),
> > following timings:
> > readTests
> > peakRefreshRate : 78.6898342320751 per second.
> > singleObjectRead : 280.8315010993404 per second.
> > oneThousandElementArrayRead : 19.93620414673046 per second.
> > oneThousandElementArrayOfObjectsRead : 9.98629332289015 per second.
> > oneMillionObjectPointersRead : 0.278357689631176 per second.
> > oneThousandLevelsDeepRead : 8.30860534124629 per second.
> > are a lot faster than the ones i'm experiencing.
> >
> > In attachment you find where the app is spending time in in the tally i
> > performed on a request.
> > The most time is spent in
> >   |237 ProcessorScheduler class>>idleProcess
> > I suppose that this is time the client is waiting for the server: is it
> > normal that 2/3 of the time is server time,
> > I've already tried some of the readstrategies, described at:
> > http://wiki.squeak.org/squeak/2638, but that did not help.
> > I've also tried on a ubuntu linux machine, and on a windows machine, both
> > display the same level of performance.
> > Thanks in advance for any advice.
> > Kind regards,
> > Bart
> >
> > _______________________________________________
> > Magma mailing list
> > Magma at lists.squeakfoundation.org
> > http://lists.squeakfoundation.org/mailman/listinfo/magma
> >
> >
>



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