erlang <-> pvm
Mon Oct 4 15:02:22 CEST 2004
I think the "easiest" (TM) way to do this would be to implement the
pvmd protocol itself in Erlang. Sending and receiving messages from
TCP/UDP ports in Erlang is very easy (especially using the binary
If you use libraries in C/perl/whatever to do this for you you'll end up
with fighting the problem of "how to interface Erlang to C/perl/whatever ..."
instead of interfacing Erlang to pvm.
The direct method using sockets and doing all the protocol work
yourself should be much easier than using some C/perl... library - this
is because the Erlang concurrency model matches very nicely with the
pvm concurrency model. In C/perl/.../any sequential language you'll
have to simulate concurrency with callbacks.
I spent 10 minutes Googeling to see if I could find the PVM protocol
specification - but I couldn't find it << amazing the most important
document of all is missing >> - in the PVM distribution there is a file
pvmproto.h which describes the inter-machine pvm *packets* (but not the
If (and it's a big if) the entire protocol is as described in
pvmproto.h and if the protocol is stateless (meaning that the PMV
machine can receive any of these protocol packets in any internal
state) then your problem looks to be rather simple.
Just code up the protocol as implied by pvmproto.h and send message to
the appropriate PVM port.
BTW - if you make any progress on this please let us know.
I'm specifically interested in any pointers to the PVM protocol
specification - I had hoped to find a short document defining the
protocol and the ports etc. that it uses. Give such a document
Erlangizing the interface should be easy. (failing this you'd have to
read the PVM code, always a painful alternative)
On Mon, 4 Oct 2004, Dietmar Admin Schaefer wrote:
> Hi !
> I have a very special problem !
> I need to read and send messages between a system using pvm as the message
> passing method
> and erlang processes.
> My first idea was to use perl as a glue because perl can read/write pvm
> messages and can send
> messages to erlang processes using sockets.
> I now find this solution a little bit dissatisfactory.
> Does anybody out there know how to directly connect erlang to pvm ???
> HOw much afford would it be ?
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