[elephant-devel] BDB vs postmodern

[lists at infoway.net]

Well, this is certainly interesting, since this would allow me to  
decouple the storage system from the lisp environment allowing the  
possibility of setting up a cluster of lisp machines to handle  
application logic. Isn't there a way to achieve this on BDB?

We prefer to deploy our systems on clusters of "inexpensive" machines  
in order to leverage hardware failures and it seems that scalability  
of BDB/Lisp applications is achieved by scaling a single machine.

Now, postmodern being 4x slower could be an issue. However, how does  
that compare to a regular CL-SQL and relational queries is a different  
story. If postmodern is about the same speed as hitting Postgres with  
CL-SQL and just using plain SQL instead of elephant, at the end of the  
day, that's the performance our users are getting anyway :)

Thanks,
Waldo

>>
>> Since Postgres does allow for features such as replication,  
>> clustering, and fail-over with multiple active simultaneous client  
>> connections, does this mean that I could have multiple (separate)  
>> lisp clients using elephant connecting to a separate Postgres  
>> cluster with no concurrency issues?
>
> Yes.
>
> You can do this on BDB, but only on the same system as it relies on  
> shared memory locks between processes.  This helps for multi-CPU  
> systems (one lisp process per CPU) but not for distributing Elephant  
> across
>
>> Thanks,
>> Waldo
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