On Fri, Feb 12, 2010 at 8:31 AM, D.C. Ernst <ernst.tr...@gmail.com> wrote:
> I had my Calculus II students working on an Introduction to Sage lab
> today.  We didn't have access to a computer lab today, so a few of
> them brought laptops.  I had them working in groups and the first
> thing they were supposed to do was create a sagenb account.  One

I improved sagenb.org so it could be used by more people effectively.
Now there are 25,000 accounts.
It's getting hammered pretty hard, especially during day hours.  E.g.,
I just looked at the log of people
doing stuff a few seconds ago (everything below is during 1 *second*):

 2010-02-12 08:37:03-0800 [HTTPChannel,88390,127.0.0.1] User
'codyrude' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88445,127.0.0.1] User 'cmullan'
logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88532,127.0.0.1] User 'ekuest'
logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88495,127.0.0.1] User 'ajaeger'
logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88415,127.0.0.1] User 'ribet' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88497,127.0.0.1] User 'hnakao' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88444,127.0.0.1] User 'koyama' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88200,127.0.0.1] User 'parlar' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88576,127.0.0.1] User
'i_grivell' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88578,127.0.0.1] User 'wangwh' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88204,127.0.0.1] User 'ekuest' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88404,127.0.0.1] User 'hebites' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88448,127.0.0.1] User 'daldrich'
logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88585,127.0.0.1] User
'dinolorenzini' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88449,127.0.0.1] User 'daldrich'
logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88411,127.0.0.1] User
'xroywadex' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88524,127.0.0.1] User 'scofield'
logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88441,127.0.0.1] User 'penalosa'
logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88081,127.0.0.1] User
'GonzaloOrellana' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88191,127.0.0.1] User 'penalosa'
logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88406,127.0.0.1] User 'xime' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88536,127.0.0.1] User 'coringa' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88514,127.0.0.1] User
'MathematicsForCG' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88534,127.0.0.1] User 'scofield'
logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88447,127.0.0.1] User 'coringa' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88281,127.0.0.1] User
'Allhopeforhumanity' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88318,127.0.0.1] User 'penalosa'
logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88450,127.0.0.1] User
'MathematicsForCG' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88084,127.0.0.1] User 'DerKeil' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88583,128.95.224.68] User
'wstein' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88431,127.0.0.1] User 'ajaeger' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88270,127.0.0.1] User 'xarles' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88142,127.0.0.1] User 'ethan' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88275,127.0.0.1] User
'allen_j...@bentley.edu' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88507,127.0.0.1] User 'scofield'
logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88101,127.0.0.1] User
'dinolorenzini' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88278,127.0.0.1] User
'GonzaloOrellana' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88405,127.0.0.1] User 'DerKeil' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88202,127.0.0.1] User
'CrystalPegasus' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88296,127.0.0.1] User
'xturner221x' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88353,127.0.0.1] User
'math_in_maine' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88424,127.0.0.1] User 'j.tworek'
logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88496,127.0.0.1] User 'hnakao' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88080,127.0.0.1] User 'rafarob' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88387,127.0.0.1] User
'xturner221x' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88575,127.0.0.1] User 'ajaeger' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88451,127.0.0.1] User
'CrystalPegasus' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88586,127.0.0.1] User
'dinolorenzini' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88442,127.0.0.1] User 'ebodine' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88429,127.0.0.1] User 'penalosa'
logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88409,127.0.0.1] User
'dinolorenzini' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88352,127.0.0.1] User
'hairybill' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88518,127.0.0.1] User
'xroywadex' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88283,127.0.0.1] User 'coringa' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88525,127.0.0.1] User
'allen_j...@bentley.edu' logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88274,127.0.0.1] User 'scofield'
logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88492,127.0.0.1] User 'penalosa'
logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88397,127.0.0.1] User 'kkulesza'
logged in.
2010-02-12 08:37:03-0800 [HTTPChannel,88535,127.0.0.1] User 'compmath'
logged in.
2010-02-12 08:37:04-0800 [HTTPChannel,88528,127.0.0.1] User
'MathematicsForCG' logged in.
2010-02-12 08:37:04-0800 [HTTPChannel,88508,127.0.0.1] User
'mattwanless2' logged in.
2010-02-12 08:37:04-0800 [HTTPChannel,88446,127.0.0.1] User
'dinolorenzini' logged in.
2010-02-12 08:37:04-0800 [HTTPChannel,88440,127.0.0.1] User 'rafarob' logged in.
2010-02-12 08:37:04-0800 [HTTPChannel,88502,127.0.0.1] User
'dinolorenzini' logged in.
2010-02-12 08:37:04-0800 [HTTPChannel,88529,127.0.0.1] User 'penalosa'
logged in.
2010-02-12 08:37:04-0800 [HTTPChannel,88408,127.0.0.1] User
'Allhopeforhumanity' logged in.

I will have to do further work and profiling to scale the notebook to
work robustly for even more users.
Note that the bottleneck at this point has nothing to do with the
hardware or network -- it's entirely a software/programming problem.
I'll work on this during the spring quarter (paid for by Univ of
Washington).

William


> student would create an account, then log out, then hand the laptop to
> the next student in the group to create an account.  There were
> several headaches that followed.  We got lots of "proxy" errors that I
> had never encountered myself, quite a few "cookie incidents", and
> timeout issues which were related to the wireless in the room.  It
> wasn't the best first introduction to Sage, but hopefully my
> overwhelming excitement about Sage counteracted any frustration.
>
> --
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>



-- 
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org

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