Multithreading Models

Many-to-one

多個 user-level thread 對應到一個 kernel thread
一個 thread 被 block 會使全部被 block
不能平行化
- 最終只有一個 thread 在 kernel 中

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The image file may be corrupted
The server hosting the image is unavailable
The image path is incorrect
The image format is not supported

One-to-One

一個 user-level thread 對應到一個 kernel thread
More concurrency than many-to-one
因為 kernel thread 數量太多會有 overhead，因此會限制 thread 的數量

Image Not Showing Possible Reasons

The image file may be corrupted
The server hosting the image is unavailable
The image path is incorrect
The image format is not supported

Many-to-Many

多個 user-level thread 對應到多個 kernel thread
結合了 M:O 和 O:O 的優點
允許 OS 建立足夠的(小於等於 user-level thread 數量) kernel thread

Image Not Showing Possible Reasons

The image file may be corrupted
The server hosting the image is unavailable
The image path is incorrect
The image format is not supported

Two-level

類似 M:M 但允許一個 user thread 對應到一個 kernel thread

last edit

dotWed, Jan 22, 2020 1:56 PM

Image Not Showing Possible Reasons

The image file may be corrupted
The server hosting the image is unavailable
The image path is incorrect
The image format is not supported

tags: `OS` `CSIE`