1. End to End Client/Server testing ?
I am working on a client site which is building a very large
client/server app using OS/2 workstations, OS/2 servers with
connections to mainframe CICS/DB2. Eventually they plan to upgrade the
servers and clients to NT.
I have been charged with managing the performance benchmarking of both
the host software (COBOL/CICS) using TPNS to avoid workstation and
network issues as well as the LAN (16 MB token ring). LAN testing is
done on a dedicated testing LAN using workstation scripts that emulate
the users at the workstations while connected to the IBM host and
communicating with CICS/DB2 etc.
The issue has been raised that we need to perform end to end testing
viz. determine what is the Service Level Objectives for the users as
measured at the workstation are reasonable and to set SLA's. This
would be achieved by running our LAN at production transaction volumes
(the LAN configured as a typical user installation including line
speeds to the host) as well as loading the host with transaction loads
via TPNS that would represent the other (1400+) sites that would also
be doing similar work. By measuring the response time at each
workstation in this configuration, we could get an idea of the SLO's
I maintain that we could probably achieve similar results in an easier
manner. Host testing is going to happen anyway. By noting the host
response time in the loaded situation, and measuring the network
transit time (which should be independent of the host load) without
having to load the host, we can come to a projected end to end
response time via simple addition. Certainly the work required to do
the latter is much easier than trying to do full LAN testing while
subjecting the host to a production like load (40-50 txn's/sec). Also
there are major difficulties in trying to simulate production comms
configuration i.e. 4-way dropped 9.6K lines.
Laurence Chiu : Sydney, Australia
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