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bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...trace的完整参考，见bpftrace完整参考。
该教程贡献者是Brendan Gregg, Netflix (2018), 基于他的DTrace教程系列 DTrace Tutorial。
1. 列出所有探针
bpftrace -l 'tracepoint:syscalls:sys_enter_*'
"bpftrace -l" 列出所有探测点，并且可以添加搜索项。...
String concatenation in Ruby
I am looking for a more elegant way of concatenating strings in Ruby.
16 Answers
16
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Are +0 and -0 the same?
...n Two's complement the negative-bit is also part of the value, so once you set the negative-bit, it's not zero anymore.
– Arnaud Le Blanc
Aug 28 '11 at 19:53
add a comment
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Get size of an Iterable in Java
I need to figure out the number of elements in an Iterable in Java.
I know I can do this:
10 Answers
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Where to place $PATH variable assertions in zsh?
...etc/profile followed by $HOME/.profile. If the ENV environment variable is set on invocation, $ENV is sourced after the profile scripts. The value of ENV is subjected to parameter expansion, command substitution, and arithmetic expansion before being interpreted as a pathname. [man zshall, "Compatib...
Convert a string to regular expression ruby
... editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
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}
else {
createEditor();
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Java: Clear the console
Can any body please tell me what code is used for clear screen in Java? For example in C++
14 Answers
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Can I initialize a C# attribute with an array or other variable number of arguments?
...MO):
class MyCustomAttribute : Attribute {
public int[] Values { get; set; }
public MyCustomAttribute(params int[] values) {
this.Values = values;
}
}
[MyCustomAttribute(3, 4, 5)]
class MyClass { }
Your syntax for array creation just happens to be off:
class MyCustomAttribut...
Emacs, switch to previous window
...ollowing in my .emacs file to change windows using C-x arrow-key.
(global-set-key (kbd "C-x <up>") 'windmove-up)
(global-set-key (kbd "C-x <down>") 'windmove-down)
(global-set-key (kbd "C-x <right>") 'windmove-right)
(global-set-key (kbd "C-x <left>") 'windmove-left)
...
how to convert from int to char*?
...nquer technique and once we now the maximum length of the string we simply set each character value individually. As shown in above speed tests the larger lengths get big performance penalties, but it's still far faster then the original loop method and no code has actually changed between the two m...