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【Django】DjangoでLine Profilerを使う

Last updated at Posted at 2022-04-08

Line Profilerとは

プログラムを行単位でプロファイリングできるモジュールです。今回はDjangoアプリ内で行ごとの処理時間を計測し、コンソールに表示させてみます。

Line Profilerの使い方

1. Line Profilerをインストール

$ pip install line_profiler

インストール後は $ pip freeze > requirements.txt しておくと良いでしょう。

2. 処理時間を計測したいファイル(views.pyなど)に下記を追加

views.py
# Line Profiler
import line_profiler
import atexit

profile = line_profiler.LineProfiler()
atexit.register(profile.print_stats)

# 測定したい関数にアノテーションを付ける
@profile
def foo():
    ...

3. runserverする

$ python manage.py runserver

4. ブラウザを更新するなりして関数を実行する

5. Ctrl+c でrunserverを終了する。

計測結果がコンソールに表示されます↓

Line #      Hits         Time  Per Hit   % Time  Line Contents
==============================================================
     3                                           @profile
     4                                           def foo():
     5         1    1557939.0      0.3     50.9      print('Hello World')
     6         1   10541423.0      2.1     49.1      print('foo')
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