<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.6000.16640" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV>
<DIV>>From: Robert Virding <BR>> I have a serious question which I ask out
of ignorance. </DIV>
<DIV>...</DIV>
<DIV>> but do they occur in real applications? Or is this theoretical
worry?</DIV>
<DIV> </DIV>
<DIV>Well, in my experience these things do happen during load-stress
testing usually identifying some bottleneck overlooked during the
functional testing. In one such case, this bottleneck got exposed only when we
attempted tests with rates that were higher than, say, 1000 things(*) per
second. In fact, the long message queue and performance degradation
thereof, helped us optimise the system by pinpointing the
bottleneck... with a relatively simple optimization we achieved 3000 things per
second (target was 2000).</DIV>
<DIV> </DIV>
<DIV>I'm not sure, but another time when message queu emight grow is during the
network outages -- but I do not have recent experiences in this regard
;-).</DIV>
<DIV> </DIV>
<DIV>V.</DIV>
<DIV> </DIV>
<DIV>(*) In this particular case TCAP transactions per
second.</DIV></DIV></BODY></HTML>