bug
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doc/bugs/checksum_loads_whole_file_into_memory.mdwn
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doc/bugs/checksum_loads_whole_file_into_memory.mdwn
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Using eg, fsck with the MD5 backend loads whole files into memory.
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May only happen for very large files (40 gb) or in other specific
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circumstances, including ghc version used for buildd etc.
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Observed with 6.20160217-g95bbdb8, linux standalone amd64.
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Not observed with 5.20151218-g5008846.
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Commit 7482853ddddc21f2696dcfbc82d737f03032134a may be relevant,
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but I don't understand how yet. A small test program using the same
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code doesn't exhibit the problem, even when built in the identical build
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environment as the 6.20160217-g95bbdb8 that has the problem.
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