[erlang-questions] first erlang program

Steve Davis <>
Sun Jan 6 12:44:27 CET 2013


Hm ok. By "throw in more hardware" you are meaning you wish to take 
advantage of distribution as well as concurrency. Perhaps I should have 
been more specific about the context of scaling I was talking about, 
namely, vertical. You see, while this version of the program should be able 
to use all the cores (which without more work, I don't guarantee), and 
won't exhaust resources (which is easy to prove), it also won't (and was 
not designed to) distribute across nodes. 

For that, the next step is that you need to turn eratos into a gen server 
inside an OTP application... You will need to consider in the next 
iteration of design what parts of the processing you are distributing, what 
messages need to be passed between distributed nodes. This may mean some 
thought about how elements of the algorithm can be separated 
efficiently. For all the "magic" of OTP, you will likely find that what 
erlang is rather good at is facing you with the real problem you are trying 
to solve rather than to allowing you to get distracted inside "boilerplate" 
code.

When I started learning the many capabilities of Erlang, I found that as 
well as the documentation's manuals, Joe's book was the most helpful guide 
for me... http://pragprog.com/book/jaerlang/programming-erlang (which IIRC 
may be being updated to a new edition as I write) BTW this is not to deny 
the quality of other books on Erlang (e.g. I have not read LYSE), but 
rather that Joe's book happened to fit my approach to learning.

regs,
/s

On Saturday, January 5, 2013 9:16:30 PM UTC-6, rusi wrote:
>
> On Sat, Jan 5, 2013 at 9:13 PM, Steve Davis <<javascript:>
> > wrote:
>
>> And... for fun... a refactored version that should scale and also avoid 
>> io:format:
>>
>
> Thanks Steve for your efforts.
> Now if I wanted to 'see' the scaling what do I have to do/setup?
>
> Just for context: I am demoing this to a class of noobs (more noob than me 
> if thats possible :D) on a 4-core laptop mostly on linux but could also use 
> windows.
>
> I suppose I could hook up another machine with a back-to-back ethernet 
> cable.
> Naturally I would prefer to 'scale up the scaling-up measurement'
> ie first erlang-ecosystem methods
> then linux processes methods
> then throwing more 'hard' hardware
>
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