Specifications

AM-6060 Network Server AMB98-07 Page
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20
Serial Throughput vs. Network Throughput
Alpha Micro computers are more efficient in processing data for remote workstations than for cable-
connected terminals. You can see the difference in the DOABEN tests charted below.
DOABEN (
do a ben
chmark) is a suite of tests that measure multi-user throughput on Alpha Micro
computer systems. Performance is measured in units called Milestones, which represent the number
of tasks that can be done in a certain period of time for a prescribed number of users. Programs in
the DOABEN suite exercise the system by cycling through functions such as database access,
program loading, and CPU usage.
In the tests charted on the next page, we loaded the system by superimposing a selected set of
background tasks onto the normal DOABEN suite. In two cases the background tasks were remote
jobs, running as TELNET sessions over a network. In the other two cases, the system was loaded by
serial tasks, simulating users at RS-232 terminals.
As shown on the chart, the system delivered far higher Milestone throughput rates with remote
loading (“20 REMOTE” and “40 REMOTE”) than with serial loading. Two conclusions are
apparent:
1. For a given level of throughput, an Alpha Micro computer will support more users on a
network than it will at local terminals.
2. The system handles increases in remote loading much more efficiently than increases in
serial loading. As you can see on the chart, Milestones for remote users remained in the 1500
to 1600 range, even with a doubled workload. With serial users, on the other hand, doubling
the load triggered a plunge in Milestones, from around 1400 to around 1000.
The lesson is:
If efficient use of system
resources is a goal, and you
have a choice between
AlphaTCP and RS-232, the
network gives more value
for the money.