What eats my memory?

I am trying to optimize a batch process I've run every night to reload the database of our Web site. He is running as an asynchronous process on CFMX7, and I'm on CF8 benchmarking and try to get some more performance out of it.

Base flow is that the initial request takes about 50,000 items, just get their unique digital ID, SKU, and another field. Then the program loops through the items one at a time, retrieves a bunch of data on each of them, creates a structure containing all of the data relevant to this point, adds this structure to another structure for a family of elements, then sends this structure to another asynchronous process that manages the family to write to the database. Once it does this, structures are all reset and reused (same names of variables) to the next family in the loop. This whole process takes 5-6 hours right now.

What is interesting to me is that it runs in CF8 and watch the server monitor, I see my use of memory just keep growing because the process is running, never really clean and eventually maxing out. But if I look at the details of the memory usage, I see a few variables in memory, who is recycled at each iteration. So what's eating the memory? I thought that if I reused variable and query names, they would be essentially destroyed and recreated with each iteration of the loop, but it's almost as if each iteration builds up junk in memory that never goes away.

Someone saw to that, and how can I optimize the process to better manage the memory?

Thank you all for the suggestions. It helped me to take a look nine on the process and really simplify things. I was trying to be too fancy with a lot of data and CFC structures from things around, and it turns out be much more effective as a linear process of "brute force" with a single set of scalar variables for each iteration of the loop.

But the biggest revelation was that it wasn't my process to all that was to consume all the memory - it was the new CF8 server followed! I used the monitor to monitor the memory of the JVM, but I got all the options under tension (profiling, monitoring memory), and apparently, who eats a ton of memory. Out of these options, and the process ran in 2.5 hours and never jumped over 300 MB memory JVM used. Good to know!

Tags: ColdFusion

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