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If you have ever wrote a program larger than “Hello, World!”, which worked without debugging – it doesn’t mean that you’re a genius, it just means that out of a thousand of programs you’ve wrote, you’ve got lucky once.

Most of developers spend most of their time debugging, so we probably should pay some attention to this subject…

Debugging, page 1:

Production Crashes. Post-factum Debugging. Logging. Replayable Deterministic Re(Actors)

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Quote: “I’ve seen game companies with hundreds of thousands of dollars lost per hour of unplanned server downtime.”
Another Quote: “deterministic debugging is by far the best thing I have seen for production debugging.”
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Deterministic Components for Distributed Systems

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Quote: “Then you can recover from any single server failure in a perfectly transparent manner”
Another Quote: “after the program fails in production, we can get the input log and run it in the comfort of a developer’s machine, under a debugger, as many times as we want, and get exactly the same variables at exactly the same points as happened in production”
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Avoiding ugly afterthoughts. Part b. Coding for Security, Coding for i18n, Testing as a Part of Development

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Quote: “Doing sanitization at IDL level automates quite a bit of tedious-and-error-prone work, which is always a Good Thing™”
Another Quote: “Hey, this whole thing can be made MUCH simpler, the only thing we need to acknowledge is that the best identifier for a string is the string itself!”
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Avoiding Ugly Afterthoughts. Part a. From Writing for Cross-Platform, to Writing for Debugging and Production Post-Mortem, with Error Handling in between

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Quote: “It is strongly recommended to have your build server to compile your game for at least two sufficiently-different platforms from the very beginning”
Another Quote: “If allocation of 50 bytes causes an “out of memory” error, we’re probably already long dead because of unacceptable swapping. And even if we disabled swap file – chances that we will recover from this condition, are infinitesimally small”
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Client-Side. On Debugging Distributed Systems, Deterministic Logic, and Finite State Machines

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Quote: “After your logic has failed in production, you can “replay” this inputs-log on your functionally identical in-house system, and the bug will be reproduced at the very same point where it has originally happened.”
Another Quote: “You can implement your Finite State Machine as a deterministic variation of a usual event-driven program”
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Multi-threading at Business-logic Level is Considered Harmful

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Quote: “However, the window for triviality is very narrow: for example, even going into two interrelated mutexes instead of one, can easily make multi-threading non-trivial”
Another Quote: “Technically you are able to jump to any point of your program, but the variables you see may (and if you have a multi-threaded bug – will) differ every time you jump there.”
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