The duration to apply the DOM changes dropped by 45% when we were able to remove JS glue code. DOM operations can already be expensive; WebAssembly users can’t afford to pay a 2x performance tax on top of that. And as this experiment shows, it is possible to remove the overhead.
It’s based on ComposeFS, whose primary focus is ensuring data integrity. It relies on EROFS (Enhanced Read-Only File System) to guarantee that data won’t be corrupted and to store file metadata. It natively performs data deduplication and LZ4 compression.
，更多细节参见同城约会
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But of course, like any immutable system, there are mutable parts (otherwise, we couldn’t create any configuration files). OSTree handles this with “overlays” (actually, we use OverlayFS) that allow a read-write filesystem to be layered on top of the immutable system. For example, the /etc and /var directories are writable, while the rest of the system is read-only.