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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

bpftrace教程【官方】bpftrace_tutorial该教程通过12个简单小节帮助你了解bpftrace的使用。每一小节都是一行的命令,你可以立马运行并看到运行效果。该教程系列用来介绍bpftrace的概念。关于bpftrace的完整参考,见bpftr 该教程通过12...
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What is the purpose of Flask's context stacks?

...ing" example: from werkzeug.wsgi import DispatcherMiddleware from frontend_app import application as frontend from backend_app import application as backend application = DispatcherMiddleware(frontend, { '/backend': backend }) Notice that there are two completely different Flask applicat...
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python: Change the scripts working directory to the script's own directory

..., you can use the os.path functions: import os abspath = os.path.abspath(__file__) dname = os.path.dirname(abspath) os.chdir(dname) This takes the filename of your script, converts it to an absolute path, then extracts the directory of that path, then changes into that directory. ...
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django urls without a trailing slash do not redirect

... check your APPEND_SLASH setting in the settings.py file more info in the django docs share | improve this answer | ...
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Determining 32 vs 64 bit in C++

...vironment or not and use that to set my variables. // Check windows #if _WIN32 || _WIN64 #if _WIN64 #define ENVIRONMENT64 #else #define ENVIRONMENT32 #endif #endif // Check GCC #if __GNUC__ #if __x86_64__ || __ppc64__ #define ENVIRONMENT64 #else #define ENVIRONMENT32 #endif #endif Another easi...
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Running a specific test case in Django when your app has a tests directory

...ecify tests to run like: python manage.py test another.test:TestCase.test_method or as noted in comments, use the syntax: python manage.py test another.test.TestCase.test_method share | improv...
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Why aren't superclass __init__ methods automatically invoked?

Why did the Python designers decide that subclasses' __init__() methods don't automatically call the __init__() methods of their superclasses, as in some other languages? Is the Pythonic and recommended idiom really like the following? ...
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What are the differences between json and simplejson Python modules?

...plejson from timeit import repeat NUMBER = 100000 REPEAT = 10 def compare_json_and_simplejson(data): """Compare json and simplejson - dumps and loads""" compare_json_and_simplejson.data = data compare_json_and_simplejson.dump = json.dumps(data) assert json.dumps(data) == simplejson...
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How can one use multi threading in PHP applications

...in/php <?php class AsyncOperation extends Thread { public function __construct($arg) { $this->arg = $arg; } public function run() { if ($this->arg) { $sleep = mt_rand(1, 10); printf('%s: %s -start -sleeps %d' . "\n", date("g:i:sa"), $th...
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Replace multiple characters in one replace call

... Use the OR operator (|): var str = '#this #is__ __#a test###__'; str.replace(/#|_/g,''); // result: "this is a test" You could also use a character class: str.replace(/[#_]/g,''); Fiddle If you want to replace the hash with one thing and the underscore with anothe...