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Golang程序性能排查

2022年10月15日2022年12月24日
Golang
120 clicked

1. 第一种方法：工具调试 1.1. ps -ef 查看进程号

[root@local]# ps -ef |grep test

root 967496 967456 99 09:57 ? 00:06:52 /usr/bin/test-controller-cn -conf /etc/tester/config.yaml
root 970312 964216 0 09:59 pts/29 00:00:00 grep --color=auto test

[root@local]# ps -ef |grep test

root 967496 967456 99 09:57 ? 00:06:52 /usr/bin/test-controller-cn -conf /etc/tester/config.yaml

root 970312 964216 0 09:59 pts/29 00:00:00 grep --color=auto test

1.1. ps -eLF 查看进程对应线程，采用的CPU核心号 -e 或者-A，选择所有的进程 L 显示线程信息 F 显示该线程使用CPU核心序号 [crayon-63d9699eb9c8615660… 阅读更多 »Golang程序性能排查

Golang的Dlv调试

2022年10月15日2022年10月15日
Golang
260 clicked

1. dlv的安装 delve,简称dlv是go语言的最常用的调试器，获取dlv的操作命令如下：

go get -u github.com/derekparker/delve/cmd/dlv
#验证dlv安装
dlv version

go get -u github.com/derekparker/delve/cmd/dlv

#验证dlv安装

dlv version

安装后直接运行dlv将会看到如下信息：

[root@localhost ~]# dlv

Delve is a source level debugger for Go programs.

Delve enables you to interact with your program by controlling the execution of the process,
evaluating variables, and providing information of thread / goroutine state, CPU register state and more.

The goal of this tool is to provide a simple yet powerful interface for debugging Go programs.

Pass flags to the program you are debugging using `--`, for example:

`dlv exec ./hello -- server --config conf/config.toml`

Usage:
  dlv [command]

Available Commands:
  attach      Attach to running process and begin debugging.
  connect     Connect to a headless debug server.
  core        Examine a core dump.
  dap         [EXPERIMENTAL] Starts a headless TCP server communicating via Debug Adaptor Protocol (DAP).
  debug       Compile and begin debugging main package in current directory, or the package specified.
  exec        Execute a precompiled binary, and begin a debug session.
  help        Help about any command
  run         Deprecated command. Use 'debug' instead.
  test        Compile test binary and begin debugging program.
  trace       Compile and begin tracing program.
  version     Prints version.

Flags:
      --accept-multiclient               Allows a headless server to accept multiple client connections.
      --allow-non-terminal-interactive   Allows interactive sessions of Delve that don't have a terminal as stdin, stdout and stderr
      --api-version int                  Selects API version when headless. New clients should use v2. Can be reset via RPCServer.SetApiVersion. See Documentation/api/json-rpc/README.md. (default 1)
      --backend string                   Backend selection (see 'dlv help backend'). (default "default")
      --build-flags string               Build flags, to be passed to the compiler. For example: --build-flags="-tags=integration -mod=vendor -cover -v"
      --check-go-version                 Exits if the version of Go in use is not compatible (too old or too new) with the version of Delve. (default true)
      --disable-aslr                     Disables address space randomization
      --headless                         Run debug server only, in headless mode.
  -h, --help                             help for dlv
      --init string                      Init file, executed by the terminal client.
  -l, --listen string                    Debugging server listen address. (default "127.0.0.1:0")
      --log                              Enable debugging server logging.
      --log-dest string                  Writes logs to the specified file or file descriptor (see 'dlv help log').
      --log-output string                Comma separated list of components that should produce debug output (see 'dlv help log')
      --only-same-user                   Only connections from the same user that started this instance of Delve are allowed to connect. (default true)
  -r, --redirect stringArray             Specifies redirect rules for target process (see 'dlv help redirect')
      --wd string                        Working directory for running the program.

Additional help topics:
  dlv backend  Help about the --backend flag.
  dlv log      Help about logging flags.
  dlv redirect Help about file redirection.

Use "dlv [command] --help" for more information about a command.

[root@localhost ~]# dlv

Delve is a source level debugger for Go programs.

Delve enables you to interact with your program by controlling the execution of the process,

evaluating variables, and providing information of thread / goroutine state, CPU register state and more.

The goal of this tool is to provide a simple yet powerful interface for debugging Go programs.

Pass flags to the program you are debugging using `--`, for example:

`dlv exec ./hello -- server --config conf/config.toml`

Usage:

dlv [command]

Available Commands:

attach Attach to running process and begin debugging.

connect Connect to a headless debug server.

core Examine a core dump.

dap [EXPERIMENTAL] Starts a headless TCP server communicating via Debug Adaptor Protocol (DAP).

debug Compile and begin debugging main package in current directory, or the package specified.

exec Execute a precompiled binary, and begin a debug session.

help Help about any command

run Deprecated command. Use 'debug' instead.

test Compile test binary and begin debugging program.

trace Compile and begin tracing program.

version Prints version.

Flags:

--accept-multiclient Allows a headless server to accept multiple client connections.

--allow-non-terminal-interactive Allows interactive sessions of Delve that don't have a terminal as stdin, stdout and stderr

--api-version int Selects API version when headless. New clients should use v2. Can be reset via RPCServer.SetApiVersion. See Documentation/api/json-rpc/README.md. (default 1)

--backend string Backend selection (see 'dlv help backend'). (default "default")

--build-flags string Build flags, to be passed to the compiler. For example: --build-flags="-tags=integration -mod=vendor -cover -v"

--check-go-version Exits if the version of Go in use is not compatible (too old or too new) with the version of Delve. (default true)

--disable-aslr Disables address space randomization

--headless Run debug server only, in headless mode.

-h, --help help for dlv

--init string Init file, executed by the terminal client.

-l, --listen string Debugging server listen address. (default "127.0.0.1:0")

--log Enable debugging server logging.

--log-dest string Writes logs to the specified file or file descriptor (see 'dlv help log').

--log-output string Comma separated list of components that should produce debug output (see 'dlv help log')

--only-same-user Only connections from the same user that started this instance of Delve are allowed to connect. (default true)

-r, --redirect stringArray Specifies redirect rules for target process (see 'dlv help redirect')

--wd string Working directory for running the program.

Additional help topics:

dlv backend Help about the --backend flag.

dlv log Help about logging flags.

dlv redirect Help about file redirection.

Use "dlv [command] --help" for more information about a command.

2. 基础命令上面列举了dlv的一些命令，其中常用的有如h… 阅读更多 »Golang的Dlv调试

Python类装饰器

2022年9月12日
Code, Python
150 clicked

Python 函数装饰器 1. 前言什么是装饰器呢？就是在特定条件下为某些函数再不改动函数体的时候为函数新添加一些功能，这就是装饰器实现原理：基于@语法和函数闭包，将原函数封装在闭包中，然后将函数赋值为一个新的函数（内置函数），执行函数时再在内层函数中执行闭包中的原函数实现效果：可以在你改变函数内部代码和调用的前提下… 阅读更多 »Python类装饰器

Python静态类方法(转载)

2022年8月14日
Code, Python
539 clicked

1. 静态类方法@staticmethod和@classmethod的关系 1.1. 基础介绍

class MyClass:
    def method(self):
        return 'instance method called', self

    @classmethod
    def classmethod(cls):
        return 'class method called', cls

    @staticmethod
    def staticmethod():
        return 'static method called'

class MyClass:

def method(self):

return 'instance method called', self

@classmethod

def classmethod(cls):

return 'class method called', cls

@staticmethod

def staticmethod():

return 'static method called'

实例方法 MyClass调用的第一个方法method是常规实例方法。这是您大多数时候会使用的基本，简洁的方法类型。您可以看到该方法采用一个参数，self该参数指向MyC… 阅读更多 »Python静态类方法(转载)

Python部分默认函数

2022年8月14日2022年8月21日
Code, Python
250 clicked

1. __init__ Python在你实例化class类的时候会检查这个类中是否有init，如果有就会调用它。进行初始化。init()方法意义重大的原因有两个: 在对象生命周期中初始化；每个对象必须正确初始化后才能正常工作。 _init__()参数值可以有多种形式。 [crayon-63d9699ebc2ca204917737… 阅读更多 »Python部分默认函数

Python类中部分默认函数的调用

2022年8月10日2022年8月10日
Code, Python
193 clicked

1. call 例类Run中展示call的使用方法，call接收对象传入的参数，可在call方法里执行某一特定对象的参数和方法（pytorch中模型正向传播的forward应该是对该函数的重写）:

class Run():
    def __init__(self,a):
        print('这是a:',a)
    def __call__(self, *args, **kwargs):
        print("这是call里的其他参数",args)
test=Run(123)
test('hehe')

class Run():

def __init__(self,a):

print('这是a:',a)

def __call__(self, *args, **kwargs):

print("这是call里的其他参数",args)

test=Run(123)

test('hehe')

输出： [crayon-63d9699ebc4ce55090562… 阅读更多 »Python类中部分默认函数的调用

Golang Mock使用入门

2022年8月2日2022年8月2日
Code, Golang
911 clicked

1. 概述前面介绍了golang的一般单元测试，以及如何使用vscode进行高效的go单元测试开发。同时也说过一般单元测试重点在于cpu和内存类型的测试，而对io类型的测试是比较敏感的。那么针对这类测试就没法做单元测试了吗？有的，肯定是有的，这就是mock技术。 mock测试不但… 阅读更多 »Golang Mock使用入门