Measuring External Duration of Endpoints

stopwatch.jpeg

We performed load testing a of new application with a client recently and a recurring question repeatedly came up: “How long was the transaction in OLS.Switch and how long was it at the endpoint ?”

It is an important question - one that is used to monitor application performance as well as to assist in troubleshooting purposes - and one we can clearly answer - the transaction took - a total of 5.6 seconds - and we waited up to our configured endpoint timeout of 5 seconds before we timed-out the transaction. Or - the transaction took 156 ms - 26 ms of those against a local response simulator.

In our application we use a profiler to trace execution time of each of our Transaction Participants: In which we see in our application logs as:

A normal transaction:

open [0/0]
parse-request [7/7]
create-***-tranlog [9/16]
populate-****-tranlog [1/17]
validate-***** [42/59]
validate-***** [1/60]
validate-**** [0/60]
create-*****-request [24/84]
query-** [26/110]
prepare-**-response [40/150]
close [6/156]
send-response [0/156]
end [157/157]

A timed-out transaction:

open [2/2]
parse-request [23/25]
create-***-tranlog [91/116]
populate-***-tranlog [1/117]
validate-*** [67/184]
validate-***-card [31/215]
validate-** [1/216]
create-****-request [32/248]
query-*** [5000/5248]
prepare-***-response [67/5315]
close [284/5599]
send-response [0/5599]
end [5600/5600]

(* note these traces are from a test app running on my macbook and are for illustrative purposes only *)

While we can answer the question by reviewing application logs - it is harder to perform any analysis on a series of transactions, specifically for external duration. We can do currently for total duration, however - this is valuable from the device perspective for how long a transaction took to process.

Logging the external duration along with our total duration for switched-out transactions and we now have:

duration.png

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