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Error handling in C code
... expensive, even if no error is ever thrown it will consume quite a bit of CPU time and stack space. When using gcc for Windows, you can choose between different exception handling methods for C++, one of them bases on setjmp and it makes your code up to 30% slower in practice.
...
Why does Math.round(0.49999999999999994) return 1?
...ts, you should expect the results to differ a bit on various environments (CPU, 32- or 64-bit mode).
And, when using round or inverting matrices, etc., these bits can make a huge difference.
x64 output:
10.5 rounded is 11
10.499999999999998 rounded is 10
9.5 rounded is 10
9.499999999999998 rounde...
How can I measure the speed of code written in PHP? [closed]
...e function that is slowing everything down ^^
Note that Xdebug counts the CPU time spent by PHP ; when PHP is waiting for an answer from a Database (for instance), it is not working ; only waiting. So Xdebug will think the DB request doesn't take much time !
This should be profiled on the SQL serve...
What does Redis do when it runs out of memory?
...ood enough results. 10 Approximates very closely
# true LRU but costs more CPU. 3 is faster but not very accurate.
#
# maxmemory-samples 5
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Does “display:none” prevent an image from loading?
...of your browser's developer tools.
Note that if the browser is on a small CPU computer, not having to render the image (and layout the page) will make the whole rendering operation faster but I doubt this is something that really makes sense today.
If you want to prevent the image from loading you...
现实版《道士下山》：道长老梁的四面人生 - 轻松一刻 - 清泛网 - 专注C/C++...
...前已经4皇冠；在“知乎”上，他解答了120个道教的相关问题，获得了7000个赞同；他还是道教题材的玄幻小说《返真》的作者，起点中文网A级签约作家……
在现实生活中，在金仙观里，却丝毫看不出他的“另类”，只是普通的...
How to use QueryPerformanceCounter?
... should prevent my thread from getting rescheduled to anything but the 1st CPU core. (Which is obviously only a solution for a testing environment)
– Lucas
May 22 '13 at 11:04
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What platforms have something other than 8-bit char?
....
For instance, most early-90s developers assumed that a particular no-op CPU timing delay taking a fixed number of cycles would take a fixed amount of clock time, because most consumer CPUs were roughly equivalent in power. Unfortunately, computers got faster very quickly. This spawned the rise of...
Generating random integer from a range
...ate tens of millions of random numbers in less than a second on a standard CPU with this technique.
EDIT:
Although the above is technically correct, DSimon's answer is probably more useful in practice. You shouldn't implement this stuff yourself. I have seen a lot of implementations of rejection s...
Increasing the maximum number of TCP/IP connections in Linux
...ique allows me to use large data packets, reduce fragmentation, reduces my CPU utilization both in the user land and at kernel-level.
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