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通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...imit -d unlimited；对进程的数据段大小不进行限制。
-f
进程可以创建文件的最大值，以 blocks 为单位。
ulimit – f 2048；限制进程可以创建的最大文件大小为 2048 blocks。
-l
最大可加锁内存大小，以 Kbytes 为单位。
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How to retrieve absolute path given relative
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use:
find "$(pwd)"/ -type f
to get all files or
echo "$(pwd)/$line"
to display full path (if relative path matters to)
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Batch: Remove file extension
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In case the file your variable holds doesn't actually exist the FOR approach won't work. One trick you could use, if you know the length of the extension, is taking a substring:
%var:~0,-4%
the -4 means that the last 4 digits (presumably .ext) will be truncated.
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Get nth character of a string in Swift programming language
...ng a linear loop inside another linear loop means this for loop is accidentally O(n2) — as the length of the string increases, the time this loop takes increases quadratically. Instead of doing that you could use the characters's string collection.
– ignaciohugog
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What does character set and collation mean exactly?
...a symbol, the number 0 is the
encoding for 'A', and the combination
of all four letters and their
encodings is a character set.
Now, suppose that we want to compare
two string values, 'A' and 'B'. The
simplest way to do this is to look at
the encodings: 0 for 'A' and 1 for
'B'. Be...
Rails 4 - passing variable to partial
I am following the Ruby on Rails tutorial and have come across a problem while trying to pass variables to partials.
7 Answ...
What's the shortest code to cause a stack overflow? [closed]
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All these answers and no Befunge? I'd wager a fair amount it's shortest solution of them all:
1
Not kidding. Try it yourself: http://www.quirkster.com/iano/js/befunge.html
EDIT: I guess I need to explain this one. The 1 o...
Why should the copy constructor accept its parameter by reference in C++?
... reference, it's by value. To do that you make a copy, and to do that you call the copy constructor. But to do that, we need to make a new value, so we call the copy constructor, and so on...
(You would have infinite recursion because "to make a copy, you need to make a copy".)
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How do I test a private function or a class that has private methods, fields or inner classes?
...mework.
@Jailbreak Foo foo = new Foo();
// Direct, *type-safe* access to *all* foo's members
foo.privateMethod(x, y, z);
foo.privateField = value;
This way your code remains type-safe and readable. No design compromises, no overexposing methods and fields for the sake of tests.
If you have...
Why does mongoose always add an s to the end of my collection name
For example, this code results in a collection called "datas" being created
8 Answers
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