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You could mount a compressing filesystem on top of the tmpfs. If it would be still maintained, fusecompress would fit the purpose well. Unfortunately it seems to be outdated, so we need another implementation (it may be better to not use a FUSE-based filesystem for performance reasons anyway): It seems that both Btrfs and ZFS should work - but I can not ...


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You can use ncdu itself! This shows the uncompressed sizes of the files. In the case you say you care about, namely many uncompressible files, it should reflect what you need pretty well: Too make the file sizes accessible to ncdu, they need to be in a file system. So we need to mount the archive as a file system. We use a fuse user-space filesystem ...



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