>On Mon, 9 Oct 2000, Bruce ONeel wrote:
>
>>  Hi,
>>    I've uploaded 3 new Mac VMs which John sent me:
>
>Are these VMs optimized at all?  Does CodeWarrior (or MPW?) allows for any
>general optimization (ala gcc -On) or specific G3 or G4 (AltiVec)
>optimization?
>
>Aaron

Yes these VM's are optimized for 603 CPUs. I'll consider looking at 
the 750 optimization for the next version, but remember lots of 
schools have 604 or less machines, goodness even rows of SE/30's. So 
some more testing is required to decide which is the best Code 
Warrior optimization level *and* target CPU for the general class of 
machines that Squeak runs on, testing in Aug showed that some obvious 
choices did NOT produce the best results.

I should point out that another revision of the VM will come out in a 
week or two, pending changes to TCP/IP to solve problems with high 
swiki loads. I've identified two different problems, and a problem 
with finalization that I'm still trying to pin point, as you can 
realize this last issue is difficult to understand.

These problems are all triggered if your code fails to close and/or 
destroy the socket after use, if you leave the socket to be finalized 
then issues arise (they shouldn't, perhaps < 1% of the time we run 
into a unique situation which triggers the two problems). The most 
common way of doing this is doing a listen/accept and getting a 
socket which is closed or is in some sort of error state, then you 
just let the socket get GCed, versus doing an explicit destroy.

So check your code and close and destroy or destroy those sockets 
after you finish using them. Besides in my testing it wasn't uncommon 
to get 300+ sockets waiting to be finalized, after all finalization 
doesn't occur right away...
-- 
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