Optimizing If statement conditions

Thank you very much for weighing in on this Joe, adding double-quotes did indeed consolidate the conditions as I expected. Boy, TCL sure isn't Perl is it?

Since you were kind enough to provide valueable insight, I did some analysis. I used ApacheBench Version 2.0.41-dev <$Revision: 1.141 $>. I hit the VIP 100000 times with a maximum number of concurrent connections set to 25. And I ran the test three times for each method. The results are below.

Assuming my methodology is sound, it looks to me like the most effecient in terms of processing cycles is to consolidate the conditions like

if { "[HTTP::host][HTTP::uri]" equals "www.myhost.com/admin" }

 

The difference is small, but evident. Also, I wonder why the min-cycles is always zero??? I'm running 10.2.0.

timing on
when HTTP_REQUEST {
  if { "[HTTP::host][HTTP::uri]" equals "www.myhost.com/admin" } {
    HTTP::uri "/new_uri"
  }
}
********************
ltm rule-event myrule:HTTP_REQUEST {
    aborts 0
    avg-cycles 11501
    event-type HTTP_REQUEST
    failures 0
    max-cycles 121243
    min-cycles 0
    name myrule
    priority 500
    total-executions 100022
}
ltm rule-event myrule:HTTP_REQUEST {
    aborts 0
    avg-cycles 11536
    event-type HTTP_REQUEST
    failures 0
    max-cycles 220940
    min-cycles 0
    name myrule
    priority 500
    total-executions 100016
}
ltm rule-event myrule:HTTP_REQUEST {
    aborts 0
    avg-cycles 11366
    event-type HTTP_REQUEST
    failures 0
    max-cycles 105512
    min-cycles 0
    name myrule
    priority 500
    total-executions 100015
}

timing on
when HTTP_REQUEST {
  if { [HTTP::host] equals "www.myhost.com" and [HTTP::uri] equals "/admin" } {
    HTTP::uri "/new_uri"
  }
}
********************
ltm rule-event myrule:HTTP_REQUEST {
    aborts 0
    avg-cycles 11877
    event-type HTTP_REQUEST
    failures 0
    max-cycles 112904
    min-cycles 0
    name myrule
    priority 500
    total-executions 100015
}
ltm rule-event myrule:HTTP_REQUEST {
    aborts 0
    avg-cycles 11751
    event-type HTTP_REQUEST
    failures 0
    max-cycles 148691
    min-cycles 0
    name myrule
    priority 500
    total-executions 100018
}
ltm rule-event myrule:HTTP_REQUEST {
    aborts 0
    avg-cycles 11810
    event-type HTTP_REQUEST
    failures 0
    max-cycles 77001
    min-cycles 0
    name myrule
    priority 500
    total-executions 100014
}