tcpip vs pdl-tcpip with tcp_acknak.pdl

[Jeff Dinsmore]

For inter-process/inter-site communication, can someone explain the relative merits of PROTOCOL:tcpip vs PROTOCOL:pdl-tcpip with tcp_acknak.pdl ?

I’m looking for speed and reliability. I’ve been using the straight tcpip protocol. It seems to be working very well, but want to know whether or not I’m at risk for data loss.

Thanks!

Jeff Dinsmore
Chesapeake Regional Healthcare

Topic

[Jim Kosloskey]

Jeff,

It is a good idea to have acknowledgments.

We use a Tcl proc to generate acknowledgments and it can generate either HL/7 or a ‘flat’ acknowledgment (3 chars – ack).

Length encapsulated tcp/ip is faster than pdl but not that significantly in my opinion so that does not matter but an HL/7 ACk is longer (even a basic one).

email: jim.kosloskey@jim-kosloskey.com 30+ years Cloverleaf, 60 years IT – old fart.

[Richard Hart]

Hi Jeff.

The tcp-acknak.pdl provides single character ACKs at the PDL level.

We tested this about 10 years ago between Cloverleaf sites and did not manage to lose a message; we now use this for all our intersite connections – we have about 70 sites.

I agree with Jim.

Quote:

It is a good idea to have acknowledgments.

[David Harrison]

I need to do this but I can’t find tcp_acknak.pdl. I’m on Cloverleaf 5.6.

[David Harrison]

Ok, I’ve found it.

[Author]

Replies