We stumbled upon a rather strange problem IMO. Our clients have been complaining about the speed at which our application imports and processes data from files [ filesize 1kB cca, time required to import the file under normal conditions is 4-10 seconds, depending on the overall workload. Yes, it is a lot ]…
So we started looking into it, but something quite unexpected happened: after inserting debug log outputs into certain parts of the code [ not affecting the logic otherwise ] the import sped up quite a lot : 300ms-2200ms /file depending on the overall workload.
Language used: Java
JDK 6_34 on my station [ don’t know what versions my colleagues use ]
I’ve went through the code… many times. Nothing unusual. Even though it’s all executed in a thread, this thread doesn’t have a competitor doing the same job OR accessing the same files.
Is this situation familiar to anyone?
P.S.: I do hope that this question does belong here. If not, I apologize sincerely.
edit:
as for logging, we use log4j.
OS: Windows XP / my machine. One colleague has the same, the other uses Win7 /
CPU: E7500 @ 2.93 GHz
RAM: 2 GB DDR2
One other machine is basically the same. The configuration of the third is unknown to me as it’s new and not my workstation.
Files are all loaded/stored from/to a local HDD in my situation.
What concerns me most is that we use a platform for which we have no source, because, well we’ve paid for a license, but not source >.<
Adding logging adds synchronisation points to your logic. Perhaps what you are seeing is a (odd) side effect of this.