# I am the Watcher. I am your guide through this vast new twtiverse.
# 
# Usage:
#     https://watcher.sour.is/api/plain/users              View list of users and latest twt date.
#     https://watcher.sour.is/api/plain/twt                View all twts.
#     https://watcher.sour.is/api/plain/mentions?uri=:uri  View all mentions for uri.
#     https://watcher.sour.is/api/plain/conv/:hash         View all twts for a conversation subject.
# 
# Options:
#     uri     Filter to show a specific users twts.
#     offset  Start index for quey.
#     limit   Count of items to return (going back in time).
# 
# twt range = 1 1
# self = https://watcher.sour.is/conv/pxnx4lq
yue-fang-readfog-go
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Go 語言中的零拷貝**
傳統讀寫模式------傳統讀寫模式流程圖第一次數據拷貝: 用戶進程發起 read() 系統調用，當前上下文從用戶態切換至內核態，DMA(Direct Memory Access) 引擎從文件中讀取數據，並存儲到內核態緩衝區 (DMA 拷貝) 第二次數據拷貝: 將數據從內核態緩衝區拷貝到用戶態緩衝區 (CPU 拷貝)，然後返回給用戶進程，拷貝數據時會發生一次上下文切換 (從內核態切換到用戶態 ⌘ Read more