I have a C++ implementation of a polyphase sort algorithm that handles dates as records. I'm using the stream library for file reading and writing, and ctime for date generation over a range of 300 years. On WSL, the program runs flawlessly, and I've tested it around one to two hundred times without issues. However, on my laptop running Ubuntu, it frequently 'swallows' records or loops endlessly when processing larger datasets (50,000 records and up), which happens about half the time. For smaller datasets, it works fine. I also set up WSL on my laptop and it runs perfectly there too. I'm curious as to what might be causing this discrepancy because the g++ version and block size are identical in both environments. My submission is already in, so I'm looking for insight into this odd situation.
4 Answers
You might want to check if the LOCALE settings are different on your two systems. That can really affect sorting, especially if you have any non-ASCII characters in your data. Even if you don't think you have them, checking the settings could reveal something.
Definitely enable warnings and set them as errors! After that, running your code through valgrind can help catch memory issues. If that doesn’t show anything, using a debugger might pinpoint where things are going awry.
Have you compiled your code with all warnings enabled? Using the -Wall flag with g++ or clang++ can highlight potential issues. If you get any warnings, fixing them might give you clues about what’s going wrong.
It sounds like there might be some undefined behavior in your code. C++ can throw you for a loop if everything isn't handled perfectly. Also, consider that WSL might handle memory management differently than Ubuntu. That could be a factor in the discrepancies you're noticing.
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