June 2015
Intermediate to advanced
268 pages
5h 59m
Japanese
Content preview from Cython ―Cとの融合によるPythonの高速化
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218
12 章 Cython と並列プログラミング
コンパイラはエラーを起こす。これは、
print
が引数を強制的に
PyObject
に変換するからだ。
with nogil
コンテキストマネージャは、（
CPU
処理もしくは
IO
待ちで）ブロックを起こす操作
の間に
GIL
を解除するために用いることもできる。すると、このスレッドがおそらくは負荷の高
い処理を並行実行している間に、他の
Python
スレッドが実行できるようになる。
ここで、
kernel
関数が
nogil
節に加えて
except 0
節も持っていたらどうなるだろうか。この
場合、
Cython
は
nogil
コンテキストマネージャ内に適切なエラー処理コードを生成し、エラーは
GIL
を再び取得したあとに伝播される。
with gil
サブコンテキストを用いて、
with nogil
コンテキストの中で一時的に
GIL
を取得する
こともできる。たとえば、
nogil
関数の中で例外を生成したり、その他
Python
オブジェクトが必
要な操作を実行したりするには、この機能を用いて
GIL
を取得して行う。
Cython
でマルチスレッド並列処理をするには、
GIL
とは何かを理解し、
GIL
の管理方法を知る
ことは必要不可欠だが、それだけでは不十分だ。
GIL
が解除されている間に、マルチスレッドを使
うコードを実際に実行するのは、依然としてプログラマの仕事である。
マルチスレッド並列実行を実現する最も簡単な方法は、すでにマルチスレッドで実装されている
外部ライブラリを使うことだ。そのようなマルチスレッド並列実行関数を呼び出すには ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.