大约有 43,000 项符合查询结果（耗时：0.0451秒） [XML]
Optimal number of threads per core
...
If your threads don't do I/O, synchronization, etc., and there's nothing else running, 1 thread per core will get you the best performance. However that very likely not the case. Adding more threads usually helps, but after some point, they cause some performance degradat...
What are the differences among grep, awk & sed? [duplicate]
...e second column of file.txt
Basic awk usage:
Compute sum/average/max/min/etc. what ever you may need.
$ cat file.txt
A 10
B 20
C 60
$ awk 'BEGIN {sum=0; count=0; OFS="\t"} {sum+=$2; count++} END {print "Average:", sum/count}' file.txt
Average: 30
I recommend that you read this book: Sed &...
Secure hash and salt for PHP passwords
...rcing a password policy of X length with X many letters, numbers, symbols, etc, can actually reduce entropy by making the password scheme more predictable. I do agree. Randomess, as truly random as possible, is always the safest but least memorable solution.
So far as I've been able to tell, making...
Select all text inside EditText when it gets focus
... @Galip OnFocusChangeListener listener = new OnFocusChangeListener... etc... then editText1.setOnFocusChangeListener(listener) editText2.setOnFocusChangeListener(listener) and so on...
– SparK
Oct 7 '13 at 20:30
...
What do I need to read to understand how git works? [closed]
...stored, how are versions kept and how do changes happen (branches, merges, etc.)?
15 Answers
...
What is the difference between HTML tags and ?
...cument, while spans should be used to wrap small portions of text, images, etc.
For example:
<div>This a large main division, with <span>a small bit</span> of spanned text!</div>
Note that it is illegal to place a block-level element within an inline element, so:
<div...
When should I choose Vector in Scala?
...
We only need to transform sequences by operations like map, filter, fold etc:
basically it does not matter, we should program our algorithm generically and might even benefit from accepting parallel sequences. For sequential operations List is probably a bit faster. But you should benchmark it if ...
Section vs Article HTML5
I have a page made up of various "sections" like videos, a newsfeed etc.. I am a bit confused how to represent these with HTML5. Currently I have them as HTML5 <section> s, but on further inspection it looks they the more correct tag would be <article> . Could anyone shed some light on...
Where to place and how to read configuration resource files in servlet based application?
...classpath-relative path:
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
InputStream input = classLoader.getResourceAsStream("foo.properties");
// ...
Properties properties = new Properties();
properties.load(input);
Here foo.properties is supposed to be placed in one of t...
What is an application binary interface (ABI)?
... an API. The API consists of data types/structures, constants, functions, etc that you can use in your code to access the functionality of that external component.
An ABI is very similar. Think of it as the compiled version of an API (or as an API on the machine-language level). When you write s...