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How to calculate the CPU usage of a process by PID in Linux from C?
...te the CPU usage of the process over the sampling time, with:
user_util = 100 * (utime_after - utime_before) / (time_total_after - time_total_before);
sys_util = 100 * (stime_after - stime_before) / (time_total_after - time_total_before);
Make sense?
...
How to center horizontally div inside parent div
...
<div id='parent' style='width: 100%;text-align:center;'>
<div id='child' style='width:50px; height:100px;margin:0px auto;'>Text</div>
</div>
share
|...
A simple explanation of Naive Bayes Classification
...sked for a 'fruit' identification example.
Let's say that we have data on 1000 pieces of fruit. They happen to be Banana, Orange or some Other Fruit.
We know 3 characteristics about each fruit:
Whether it is Long
Whether it is Sweet and
If its color is Yellow.
This is our 'training set.' We wi...
Reduce git repository size
...
In my case, I pushed several big (> 100Mb) files and then proceeded to remove them. But they were still in the history of my repo, so I had to remove them from it as well.
What did the trick was:
bfg -b 100M # To remove all blobs from history, whose size is su...
What is the best method to merge two PHP objects?
..., 'b' => 'asd'); $arr2 = array('a' => 10, 'd' => 'qwert', 0 => 100, 1 => 200, 4 => 400); $arr3 = array_merge($arr1, $arr2); echo(print_r($arr3, 1)); Actual Output : Array ( [a] => 10 [b] => asd [d] => qwert [0] => 100 [1] => 200 [2] => 400 ) Desired Output : Arr...
What does java.lang.Thread.interrupt() do?
....printf("A Time %d\n", System.currentTimeMillis());
o.wait(100);
System.out.printf("B Time %d\n", System.currentTimeMillis());
}
} catch (InterruptedException ie) {
System.out.printf("WAS interrupted\n");
}
System.out.pr...
Unusual shape of a textarea?
...le
.block_left {
background-color: red;
height: 70px;
width: 100px;
float: left;
border-right: 2px solid blue;
border-bottom: 2px solid blue;
}
.block_right {
background-color: red;
height: 70px;
width: 100px;
float: right;
border-left: 2px solid blue;
bo...
C/C++中的段错误（Segmentation fault） - C/C++ - 清泛网 - 专注C/C++及内核技术
...clude <stdio.h>
int main(){
char test[1];
printf("%c", test[1000000000]);
return 0;
}
这里是比较极端的例子，但是有时候可能是会出现的，是个明显的数组越界的问题
或者是这个地址是根本就不存在的
例子4：
Code:
#include <st...
What is the point of noreturn?
...assignment below is not:
void raise();
void f(int y) {
int x = y!=0 ? 100/y : raise(); // raise() returns void, so what should x be?
cout << x << endl;
}
[[noreturn]], on the other hand, is called sometimes empty, Nothing, Bottom or Bot and is the logical equivalent of False. ...
What is the relative performance difference of if/else versus switch statement in Java?
...emature optimalization being bad and such, no need to explain that for the 1000th time.
– Folkert van Heusden
Jul 1 '12 at 16:42
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