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How to calculate the CPU usage of a process by PID in Linux from C?
I want to programmatically [in C] calculate CPU usage % for a given process ID in Linux.
12 Answers
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What is an “unwrapped value” in Swift?
I'm learning Swift for iOS 8 / OSX 10.10 by following this tutorial , and the term " unwrapped value " is used several times, as in this paragraph (under Objects and Class ):
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How to print number with commas as thousands separators?
...ying to print an integer in Python 2.6.1 with commas as thousands separators. For example, I want to show the number 1234567 as 1,234,567 . How would I go about doing this? I have seen many examples on Google, but I am looking for the simplest practical way.
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How can one print a size_t variable portably using the printf family?
... variable of type size_t , and I want to print it using printf() . What format specifier do I use to print it portably?
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Is it possible to run JavaFX applications on iOS, Android or Windows Phone 8?
... one develop an entire application using JavaFX and run it on iOS, Android or Windows Phone 8, without writing platform-specific code?
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How do I check if an object has a specific property in JavaScript?
...ed by the answers that have been given - most of them are just outright incorrect. Of course you can have object properties that have undefined, null, or false values. So simply reducing the property check to typeof this[property] or, even worse, x.key will give you completely misleading results.
I...
Hide Utility Class Constructor : Utility classes should not have a public or default constructor
...ility class, you should make the class final and define a private constructor:
public final class FilePathHelper {
private FilePathHelper() {
//not called
}
}
This prevents the default parameter-less constructor from being used elsewhere in your code. Additionally, you can make the c...
Splitting a Java String by the pipe symbol using split(“|”)
...uses regular expression and in regex | is a metacharacter representing the OR operator. You need to escape that character using \ (written in String as "\\" since \ is also a metacharacter in String literals and require another \ to escape it).
You can also use
test.split(Pattern.quote("|"));
a...
Difference between Iterator and Listiterator?
We can use Iterator to traverse a Set or a List or a Map . But ListIterator can only be used to traverse a List , it can't traverse a Set . Why?
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Which is better, number(x) or parseFloat(x)?
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The difference between parseFloat and Number
parseFloat/parseInt is for parsing a string, while Number/+ is for coercing a value to a number. They behave differently. But first let's look at where they behave the same:
parseFloat('3'); // => 3
Number('3'); // => 3
parseFloat('1.501'); /...