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What happens to a declared, uninitialized variable in C? Does it have a value?
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In practice, they tend to just have some nonsensical value in there initially - some compilers may even put in specific, fixed values to make it obvious when looking in a debugger - but strictly speaking, the compiler is free to do anything from crashing to summoning demons through your nasal pass...
If vs. Switch Speed
Switch statements are typically faster than equivalent if-else-if statements (as e.g. descibed in this article ) due to compiler optimizations.
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When to use volatile with multi threading?
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However two threads both accessing a shared variable is something which calls for protection via a mutex isn't it?
But in that case, between the thread locking and releasing the mutex the code is in a critical section where only that one thread can access the variable, in which case the variable ...
Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...ill somewhat faster than sqrtss.
edit: If speed is critical, and you're really calling this in a loop for many values, you should be using the vectorized versions of these instructions, rsqrtps or sqrtps, both of which process four floats per instruction.
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How to lock compiled Java classes to prevent decompilation?
...e not read the post I linked to. The bytecode is converted to the dongle's CPU code and encrypted. When the end user runs the protected app, that encrypted code is transferred to the "dongle". The dongle decrypts and runs it on its CPU.
– Dmitry Leskov
Aug 10 '...
LEGO EV3 机器人按键控制 · App Inventor 2 中文网
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LEGO EV3 机器人按键控制
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Comparing Timer with DispatcherTimer
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Check to see what specifically is eating up the cpu. Are you creating lots of timers, that aren't being stopped?
– Reed Copsey
Oct 12 '09 at 17:35
3
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Network usage top/htop on Linux
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nethogs is nice, but it seems to use way more cpu on my computer than iftop
– aidan
Jul 29 '15 at 6:15
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Boost Statechart vs. Meta State Machine
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As there seems to be much interest, please allow me to give my (obviously biased) opinion, which should therefore be taken with a grain of salt:
MSM is much faster
MSM requires no RTTI or anything virtual
MSM has a more complete UML2 support (for example internal tr...
How accurate is python's time.sleep()?
...kernel unable to schedule your process as soon as you'd like, even without CPU contention. That's what the realtime kernels are trying to fix, I think. But, unless you really need realtime behavior, simply using a high tick rate (kernel HZ setting) will get you not-guaranteed-but-high-resolution s...