[erlang-questions] Writers Readers problem

Dmitry Kolesnikov <>
Mon Jan 30 22:28:39 CET 2012


why not pass tokens from (n)-process directly to (m)-process?

- D.

On Jan 30, 2012, at 11:21 PM, Gianfranco Alongi wrote:

> Okay, so here goes some of my immediate thoughts,
> 
> First - I would write some wrapper that abstracts away from the
> implementation of the storage,
> this way you should be able to try out some of your ideas quickly
> without being punished too much.
> 
> If you need access across multiple nodes, I would go for a simple
> mnesia implementation.
> If you get too much lock contention - distribute the tokens over a
> deterministic key space using hashes or whatever you need.
> Mnesia is also nice since you get redundancy and persistency - once
> your system comes up again, it's all there
> and you can start chugging along.
> 
> If this is too slow for you  and you don't need redundancy or
> persistency - try it out with ets tables.
> 
> /G
> 
> On Mon, Jan 30, 2012 at 10:07 PM, Roberto Majadas Lopez
> <> wrote:
>> 2012/1/30 Gianfranco Alongi <>
>>> 
>>> Some questions that can help us give you an accurate answer
>>> 
>>> 1) How frequent does this happen?
>>>    Once a second?
>>>    Once a minute?
>>>    Once an hour?
>> 
>> 
>> less than a second
>> 
>>> 
>>> 
>>> 2) How large is the token?
>>>    1 byte?
>>>    1 Kbyte?
>>>    1 Mbyte?
>> 
>> 
>> 
>> probably 10-20 chars
>> 
>>> 
>>> 
>>> 3) Do you need the storage to scale dynamically with more added nodes?
>> 
>> 
>> could be ok, but i think is not required
>> 
>>> 
>>> 
>>> 4) What more do you expect of the storage?
>>>    - Automatic signaling on add/delete?
>>>    - Triggers?
>> 
>> 
>> not required
>> 
>> Thanks :)
>> 
>>> 
>>>   etc
>>> 
>>> Cheers
>>> G
>>> 
>>> On Mon, Jan 30, 2012 at 7:11 PM, Roberto Majadas Lopez
>>> <> wrote:
>>>> Hello everyone:
>>>> 
>>>> I'm writting a erlang app and i've the next scenario:
>>>> 
>>>> The app has n process that writes tokens in "somewhere" and there are m
>>>> process that reads one of those tokens and remove it.
>>>> 
>>>> Which is the best way to store this tokens ?
>>>>  * global ets
>>>>  * a gen_server + ets
>>>>  * mnesia
>>>>  * ...
>>>> 
>>>> thanks in advance
>>>> 
>>>> Roberto
>>>> 
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>>>> 
>>>> http://erlang.org/mailman/listinfo/erlang-questions
>>>> 
>> 
>> 
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