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Awesome Go29 Hot1 comments20 min read
A Million Go Map Entries Take 38MB, Not 16MB
AI summary
Bối cảnh là cấu trúc map mới trong Go chiếm nhiều bộ nhớ hơn dự kiến. Nguyên nhân kỹ thuật nằm ở cách Go xử lý collision bucket, mỗi entry đều phải lưu trữ hash value 8 bytes dù không cần thiết cho tìm kiếm. Hệ quả là 1 triệu entries trong Go map chiếm tới 38MB thay vì 16MB như kỳ vọng, gây lãng phí tài nguyên đáng kể. Điều đáng học là bài viết phân tích chi tiết cách tối ưu bộ nhớ trong Go map, giúp lập trình viên hiểu rõ trade-off giữa performance và memory usage khi sử dụng hash table trong Go.
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Why read it: Bài viết tiết lộ lý do tại sao cấu trúc Go map mới chiếm dụng bộ nhớ nhiều hơn so với dự kiến.
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Source: https://dev.to/nazar-boyko/a-million-go-map-entries-take-38mb-not-16mb-2ij3. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.
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