The text map file contains information about the shared cache file, and looks like this: mapping EX 1331MB 0x7FFF20000000 -> 0x7FFF73398000 map extension) and a binary shared cache file (without extension), for example: dyld_shared_cache_x86_64h.map They both store pairs of files: a text map file (with a. Let me expand on this: the contents of /var/db/dyld/ (Catalina and earlier macOS versions) and /System/Library/dyld/ (Big Sur) are essentially the same. Instead, in macOS 11 Big Sur, the cache files contain most of the macOS libraries. This results in significant performance improvements to launch time. When loading, dyld will first check if is in the share cache, and if it is will use that pre-bound version instead of opening, mapping, and binding the original file. In previous macOS versions (at least in macOS 10.15 Catalina, from first-hand experience), these files were located in /var/db/dyld/ and could be recreated with this command (see for example Trying to force update_dyld_shared_cache but having some errors): sudo update_dyld_shared_cache -root / -forceīut update_dyld_shared_cache is deprecated in Big Sur (running the command has as only output This tool is deprecated.).įurthermore, the files in /System/Library/dyld/ no longer seem to be cache files in the sense that they store commonly used shared libraries (from man update_dyld_shared_cache): No, in Big Sur it's not safe to delete them (from the screenshot in your question, I see you are on macOS 11 Big Sur). Is it safe to delete these 4 files in the folder called dyld ( /System/Library/dyld/)?
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