PAR Lecture 15, Thurs Mar 9
Table of contents
1 Student presentations about GTC
- DP-S, Fast Splittable Pseudorandom Number Generator
- CF
- MB, Parallel Methods for Verifying the Consistency of Weakly-Ordered Architectures
- NB
- TN
- ET
- ZX
2 Unionfs: Linux trick of the day
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aka overlay FS, translucent FS.
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If a, b are directories, and m is an empty directory, then
unionfs -o cow a=RW:b m
makes m to be a combo of a and b, with a being higher priority
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Writing a file into m writes it in a.
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Changing a file in b writes the new version into a
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Deleting a file in b causes a white-out note to be stored in a.
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Unmount it thus:
fusermount -u m
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None of this requires superuser.
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Application: making a read-only directory into a read-write directory.
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Note: IBM had a commercial version of this idea in its CP/CMS OS in the 1960s.
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