re: I'm an Expert in Memory Management & Segfaults, Ask Me Anything! VIEW POST


Hi Jason, pleased to meet you.
I'd like to present you a question about C memory management, if you were so nice. In short, it's about a program that lets you input or random generate a set of 5 numbers between 1 and 50, and 2 numbers between 1 and 12 (EuroMillions lottery). Then it can keep rolling over and over (more than 139 million times on average) until it gets the same set of numbers. The issue is that, despite using dynamic allocation and de allocation for structures, as code executes it would eventually exhaust the RAM memory until the process gets killed by the system to avoid stall.
I've tried a lighter version of the code (just 5 numbers from 1 to 48, 1.7 million loops on average) with no problems, and ensured the code is actually recycling the memory used with each pass. Any ideas of what could be wrong with it?
Thanks in advance, regards.


I'd really need to see some code to be able to debug this, but here's the first two things I'd look for:

  • Double check that things are actually deallocating; you'd be amazed at how often one thinks they have free'd memory when they haven't. You may be able to run it through Valgrind or another dynamic analyzer to check that. (It sounds like you've done that, though.)

  • You may have some other variable you didn't think about, either on the stack or on the heap.

If it wouldn't be too much trouble, can you put the code in a GitHub Gist or another paste bin? I might be able to catch the problem better if I read it.


Thank you so much for your quick and kind response Jason! I will paste the code to GitHub and share here a.s.a.p, I'm a newbie to it, as well as to many other things. Will take your advice and check out what you suggested.
We'll keep on touch.

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