Create: 2025-04-19 Update: 2025-07-02 06:45:17

👣 Оптимизация выделения памяти в Go: как одна строчка замедлила всё на 30%

В базе данных Dolt (аналог Git, но для SQL-таблиц) после рефакторинга один из бенчмарков (types_scan) внезапно стал работать на 30% медленнее. Причина? Казалось бы, невинная строчка кода.

📉 Что произошло
Метод GetBytes() начал вызывать ReadBytes() у интерфейса ValueStore. Всё выглядело логично, пока не включили профилировщик Go и не обнаружили странную активность:
🔍 runtime.newobject вызывался слишком часто → программа делала много лишних аллокаций в куче.

📦 Где зарыта собака


func (vs nodeStore) ReadBytes(...) ...

Этот метод использовал приёмник по значению (vs nodeStore). Это значит, что вся структура копировалась при каждом вызове метода, даже если она большая.

🚑 Как пофиксили
Просто поменяли на приёмник по указателю:


func (vs *nodeStore) ReadBytes(...) ...

Вуаля — аллокейшны исчезли, производительность восстановилась.

🧠 Вывод
❗ Методы с приёмником по значению = риск лишнего копирования и аллокаций
🛠 Даже один маленький метод может резко замедлить ваш код
🔍 Профилировка в Go — мощный инструмент. Используй pprof!

Полный разбор в блоге DoltHub
Подробнее про Dolt

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👣

Оптимизация выделения памяти в Go: как одна строчка замедлила всё на 30%

В базе данных Dolt (аналог Git, но для SQL-таблиц) после рефакторинга один из бенчмарков (types_scan) внезапно стал работать на 30% медленнее. Причина? Казалось бы, невинная строчка кода.

📉 Что произошло
Метод GetBytes() начал вызывать ReadBytes() у интерфейса ValueStore. Всё выглядело логично, пока не включили профилировщик Go и не обнаружили странную активность:
🔍 runtime.newobject вызывался слишком часто → программа делала много лишних аллокаций в куче.

📦 Где зарыта собака


func (vs nodeStore) ReadBytes(...) ...


func (vs *nodeStore) ReadBytes(...) ...

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How to Create a Custom Theme in Telegram for Desktop and Mobile

Like most instant messaging apps, Telegram helps facilitate communication. Its increasing popularity among social media users can be largely attributed to its enhanced privacy and encryption features. Also, its support for large group chat features has seen the app’s user count grow to 700 million monthly active users. The app has introduced several personalization features to maintain the interests of its users. One of such personalization options available to users is the creation of customized themes. Instead of using the default theme that typically comes with the Telegram app, users can now create theirs. Users can also share the created themes with the public. Here’s how you can create a custom Telegram theme on your desktop or mobile.

👣 Оптимизация выделения памяти в Go: как одна строчка замедлила всё на 30%

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