SeeView Server Gateway (SSG) Manual

Introducing SSG
HP NonStop SeeView Server Gateway (SSG) Manual—526356-004
1-9
SSG Performance
SSG Performance
The SSG significantly reduces the number of end-to-end messages that must occur
between client applications and host command interpreters.
Figure 1-8 shows the message flow for client-to-CI dialog when there is no SSG proxy
agent (for example when an application must perform its own Telnet or Sockets
emulation).
In Figure 1-8, each message must travel the entire path length. For a 50-message
dialog, the response time would be 50 times the path length service time, or
50 x 100ms = 5000ms.
However, when an SSG proxy agent is used, as shown in Figure 1-9, only one
message travels the entire path length, so the SSG-to-CI dialog occurs at much faster
host speeds because the end-to-end path length overhead does not occur for each
message send.
In Figure 1-9, SSG-to-CI message speeds are several orders of magnitude faster than
end-to-end LAN communication. Thus, SSG proxy agent response time is
100 + 50 x 1ms = 150 ms. This speed is roughly 30 times faster than if there were no
proxy agent.
Figure 1-8. Message Flow Without a Proxy Agent
Figure 1-9. Message Flow With an SSG Proxy Agent
Client CI
VST008.vsd
50x100ms = 5000ms
Client SSG CI
100ms
50 X 1MS=50MS
VST009.vsd