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How the single threaded non blocking IO model works in Node.js
...iting for network or disk (database / sockets) and the logic is not really CPU intensive - that is to say: this works well for IO-bound workloads.
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How to use glOrtho() in OpenGL?
...nGL 4 programs calculate the transformation matrix (which is small) on the CPU, and then give the matrix and all points to be transformed to OpenGL, which can do the thousands of matrix multiplications for different points really fast in parallel.
Manually written vertex shaders then do the multipl...
In C++, is it still bad practice to return a vector from a function?
...e at a time, which I have verified by re-running the test while monitoring CPU usage). The best performance is achieved when mem(v) = 16kB, which is the order of magnitude of L1 cache (L1 data cache for the i7-7700K is 4x32kB).
Of course, the differences become less and less relevant the more compu...
Dokan虚拟磁盘开发实战 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...在DeleteDirectory里实现删除目录的同步），而删除文件则没问题。
这里有一点需要注意：因为执行Cleanup之前，可能会多次调用CreateFile，比如记事本保存文档时就会执行两次CreateFile之后再调用Cleanup，所以我在Cleanup的最后执行MySet...
Please explain the exec() function and its family
...ated with a file block or an entire file.
Process resource utilisation and CPU time consumed is set to zero for the child.
The child also doesn’t inherit timers from the parent.
But what about the child memory? Is a new address space created for a child?
The answers in no. After the fork(), bot...
List of Big-O for PHP functions
... array size has nothing to do with algorithmic complexity, it is caused by CPU cache effects. The larger the array is, the more likely it is that random-access lookups will result in cache misses (and cache misses higher in the hierarchy).
– NikiC
Jan 28 '16 at...
What is the difference between Sublime text and Github's Atom [closed]
...as markedly improved the feel of the editor, it still feels cumbersome for CPU intensive tasks as described above, and is still slow in startup. Apart from performance improvements, Atom feels significantly more stable across the board.
Development of Sublime has picked up again since Jan 2015, wit...
When to use inline function and when not to use it?
...am and mark small functions that get called lots of times and burn through CPU cycles that as inline. The keyword here is "small" - once the function call overhead is negligible compared to the time spent in the function, it's pointless to inline them.
The other use I'd suggest is if you've got sma...
C dynamically growing array
... processing various things. I would like to avoid using too much memory or CPU for keeping such indexes...
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What REALLY happens when you don't free after malloc?
...space are simply released. By contrast, a series of free() calls will burn CPU time and can result in disk paging operations, cache misses, and cache evictions.
Regarding the possiblility of future code reuse justifing the certainty of pointless ops: that's a consideration but it's arguably not th...