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What's the difference between the atomic and nonatomic attributes?
...s the default behavior
will ensure the present process is completed by the CPU, before another process accesses the variable
is not fast, as it ensures the process is completed entirely
Non-Atomic
is NOT the default behavior
faster (for synthesized code, that is, for variables created using @prope...
Difference between std::system_clock and std::steady_clock?
...s the program required (independent of other processes running on the same CPU). Better yet, get your hands on a real profiler and use that.
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Best approach to real time http streaming to HTML5 video client
... HTML5 client (involves re-encoding, so expect quality loss and needs some CPU-power):
Set up an icecast server (could be on the same machine you web server is on or on the machine that receives the RTSP-stream from the cam)
On the machine receiving the stream from the camera, don't use FFMPEG but...
deciding among subprocess, multiprocessing, and thread in Python?
...o threading while allowing CPython to scale your processing among multiple CPUs/cores despite the GIL (Global Interpreter Lock). It leverages all the fine-grained SMP locking and coherency effort that was done by developers of your OS kernel.
The threading option:
threading is for a fairly narrow r...
Do you have to put Task.Run in a method to make it async?
...y.com/2013/11/there-is-no-thread.html
In your simple example,it is a pure CPU-bound calculation, so using Task.Run is fine.
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Why '&&' and not '&'?
...uit is a branch/jump; which could result in a branch-misprediction on your CPU; an & is much cheaper than &&. There is also a scenario where short-circuiting can actually break logic - have a look at this answer of mine.
Diatribe/Monologue: Regarding the branch mis-prediction that most ...
memory_get_peak_usage() with “real usage”
...
<!-- Print CPU memory and load -->
<?php
$output = shell_exec('free');
$data = substr($output,111,19);
echo $data;
echo file_get_contents('/proc/loadavg');
$load = sys_getloadavg();
$res = implode("",$load);
echo $res;
?>
...
How much faster is C++ than C#?
...ter will be competing with your code for instruction and data cache in the CPU. We know that cache dominates when it comes to performance and native languages like C++ do not have this type of contention, by definition.
a run-time optimizer's time budget is necessarily much more constrained than th...
How do browsers pause/change Javascript when tab or window is not active?
...stribution: setInterval vs requestAnimationFrame
Note: This test is quite CPU intensive. requestAnimationFrame is not supported by IE 9- and Opera 12-.
The test logs the actual time it takes for a setInterval and requestAnimationFrame to run in different browsers, and gives you the results in the ...
In Visual Studio C++, what are the memory allocation representations?
...e the instruction pointer lands (except perhaps the last filled byte), the CPU can resume executing a valid two-byte x86 instruction CD CD, in this case for generating software interrupt 205 (0xCD).
Weirder still, whereas CD CC CD CC is 100% interpretable--giving either INT 3 or INT 204--the sequen...