Python - 使用objgraph生成對象引用關係圖

1- objgraph簡介

• HomePage：https://mg.pov.lt/objgraph/
• PyPI：https://pypi.org/project/objgraph/
• 通常用於分析python對象相關問題，列出當前內存中存在的對象，定位內存泄露等；
• 還能夠利用graphviz工具生成可視化的對象引用關係圖；

 

2- 安裝objgraph

這裏以Window7 64bit爲例。

經過pip安裝objgraph：

$ pip3 install objgraph --proxy="10.144.1.10:8080"
Collecting objgraph
  Downloading https://files.pythonhosted.org/packages/ec/3d/c1f0e827dd2df27c8080317d667cb555d264825d/objgraph-3.4.0-py2.py3-none-any.whl
Collecting graphviz (from objgraph)
  Downloading https://files.pythonhosted.org/packages/84/44/21a7fdd50841aaaef224b943f7d10df87e473d48/graphviz-0.8.3-py2.py3-none-any.whl
Installing collected packages: graphviz, objgraph
Successfully installed graphviz-0.8.3 objgraph-3.4.0

 

安裝graphviz

graphviz（ http://www.graphviz.org/）是一個圖形可視化軟件（Graph Visualization Software），使用dot文件生成關係圖；

• 下載：https://graphviz.gitlab.io/_pages/Download/windows/graphviz-2.38.msi
• 設置環境變量：Advanced System Settings--》Advanced (tab) ---》Environmental Variables then edit the PATH variable.---》"C:\Program Files (x86)\Graphviz2.38\bin"

3- 運行objgraph

  示例：

$ ls -l
total 1
-rwxr-xr-x 1 guowli 1049089 143 May 23 16:54 TempTest.py*

$ cat TempTest.py
#! python3
# -*- coding: utf-8 -*-
import objgraph

x = []
y = [x, [x], dict(x=x)]
objgraph.show_refs([y], filename='sample-graph.png')

$ py -3 TempTest.py
Graph written to C:\Users\guowli\AppData\Local\Temp\objgraph-i96a8ww9.dot (4 nodes)
Image generated as sample-graph.png

$ ls -l
total 13
-rw-r--r-- 1 guowli 1049089 10398 May 23 16:56 sample-graph.png
-rwxr-xr-x 1 guowli 1049089   143 May 23 16:54 TempTest.py*

$

生成對象引用關係圖：

4- 在Pycharm運行objgraph

須要在Pycharm中設置Graphviz環境變量，不然可能報錯：

'The command "{}" is required to be in your path.'.format(cmd))
pycallgraph.exceptions.PyCallGraphException: The command "dot" is required to be in your
path.

 

設置Pycharm環境變量步驟：

Run --》Edit Configurations...  --》Default --》Python  --》Environment field group: Environment variables --》 ...  --》+  --》

• Name: PATH
• Value: C:\Program Files (x86)\Graphviz2.38\bin