[LON-CAPA-admin] LonCapa Slow

[Abdel Messeh, Maged]

Hi Stuart,

Thank you for your quick response.

Devel::NYTProf is what came to our mind here also; so I will have a go and might contact Damien if I need help.

Yes please, can we get those scripts.  Is there a chance you can put them on an http site so we can overcome the mail server problem?

Many thanks,

Maged



-----Original Message-----
From: lon-capa-admin-bounces at mail.lon-capa.org [mailto:lon-capa-admin-bounces at mail.lon-capa.org] On Behalf Of Stuart Raeburn
Sent: Tuesday, July 14, 2015 2:15 PM
To: lon-capa-admin at mail.lon-capa.org
Subject: Re: [LON-CAPA-admin] LonCapa Slow

Hi Maged,

> We have seen some slowness when loading the following pages:
>
> /adm/roles	---- User Roles Screen
> /adm/navmaps	 --- Subroutines to handle and render the navigation
> /adm/flip             ---- Page flip handler
>

Damien Guillaume, here at MSU has had success profiling Apache on a  
development LON-CAPA server using the Devel::NYTProf module from CPAN.

One of the pages profiled recently was the Course Contents screen  
(/adm/navmaps), and Damien recently committed a speed optimization to  
CVS HEAD, as a result of that work:

http://mail.lon-capa.org/pipermail/lon-capa-cvs/Week-of-Mon-20150615/026791.html

When using the profiler, the maximum number of Apache clients is set  
to 1, so it is not practical to use this on a production server in  
active use.  One thing you might want to consider is mirroring your  
production library server/VM to a development VM, and profiling with  
Devel::NYTProf on that development VM.

One question is whether the slowness you report is for a user session  
hosted on one of your access servers or on your LON-CAPA library server.

In the past I have created stress testing scripts, derived from the  
monitoring script found in CVS modules/raeburn/monitor.pl.  I have  
previously attempted to share those with Lee Bynum at Illinois, but it  
seems the attachment to my e-mail may have been quarantined by spam  
detection software.  I can try sending those scripts again, offlist,  
to both you and Lee.


Stuart Raeburn
LON-CAPA Academic Consortium


Quoting "Abdel Messeh, Maged" <mmesseh at illinois.edu>:

> Hi Stuart,
>
> We have seen some slowness when loading the following pages:
>
> /adm/roles	---- User Roles Screen
> /adm/navmaps	 --- Subroutines to handle and render the navigation
> /adm/flip             ---- Page flip handler
>
> Sometimes this was almost 20sec. during a lab with about 20   
> students; I have tried it myself and seen about 5 sec. delay in   
> loading those pages.
>
> All servers seemed happy about resources: CPU, memory .. etc.
> I would like to diagnose this problem and was wondering if you have   
> any direction as to where to start?  I thought about profiling the   
> perl calls to see where the slowness come from but as you know this   
> is hard to do.
>
> Thanks so much for your help,
>
> Maged
>
> --------------------------
> Maged Messeh
> ATLAS Infrastructure
>
>
> _______________________________________________
> LON-CAPA-admin mailing list
> LON-CAPA-admin at mail.lon-capa.org
> http://mail.lon-capa.org/mailman/listinfo/lon-capa-admin

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