Slides for tomorrow night

[Maged Michael]

Andrei. 

The slides look good.  If you feel time is tight you might consider moving 
the slides about lock-free structures as backup. The simple and compelling 
case is made by the flag example and user-level locking. 

A possibly helpful anecdote, the contention-free latency of pthread_mutex 
is about 75% (170-180 ns vs 95-100 ns) more than a user-level 
test-and-test-and-set mutex implemented on new 1.7 GHz Power5 (the mutexes 
are protecting a shared counter). Furthermore, if you are using the lock 
to protect a single variable read-modify-write operation, and replace that 
with a user-level implementation using CAS or LL/SC, the contention-free 
latency (42-45 ns) drops to about 25% that of pthread_mutex and 45% that 
of the user-level mutex.

Maged






Andrei Alexandrescu <andrei at metalanguage.com>
10/18/2004 03:26 AM
 
        To:     Kevlin Henney <kevlin at curbralan.com>, Maged 
Michael/Watson/IBM at IBMUS
        cc:     Doug Lea <dl at cs.oswego.edu>, Doug Lea 
<dl at altair.cs.oswego.edu>, "Boehm, Hans" <hans.boehm at hp.com>, Ben 
Hutchings <ben at decadentplace.org.uk>, pugh at cs.umd.edu
        Subject:        Slides for tomorrow night


Hello,


Tomorrow is the presentation of our paper. I have slapped together
some slides, for which quality I need to apologize in advance. I am
seriously under stress here with a number of tasks that need be done
in negative time, and at a point I almost canceled the presentation.
But somehow I miraculously found one hour to write these slides, and
what I have left to do is pray for a silver tongue.

So if any of you has time, let me know of any feedback. The
presentation will be 30 mins plus 15 mins q&a. I think there are too
many slides for 30 mins, and that the flow could be seriously
improved. Actually everything can be seriously improved :o). If you
have time, I'd be happy to hear from you.

The presentation is tomorrow 19:30 PST.


Thanks,

Andrei



#### N1680.ppt has been removed from this note on October 18, 2004 by 
Maged Michael
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