Martin Pool's blog

valgrind rocks

kcachegrind and Valgrind are just incredible: finding memory and performance problems with them is like shooting fish in a barrel. The recursive-subdivision display in kcachegrind is a minor work of art in its own right as a way of visualizing the division of the total cost of the program into smaller and smaller parts.

I think you also have to admire the audacity of Julian Seward in just writing a CPU emulator from scratch to better support debugging.

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