[Rpm-maint] [rpm-software-management/rpm] Add macro to force fsync() on close() (#187)

Jeff Johnson notifications at github.com
Sun Apr 9 03:57:14 UTC 2017


I knew if I wrote a patch, better answers would instantly appear.

There is fadvise(FADV_DONTNEED) wrto fsync(2) analogous to madvise(MADV_DONTNEED) wrto msync(2). I will add to my patch in the next few days for measurement, todo++.

The easy answer for your "Chef installs packages and my databases stall!" is likely to run
use nocache from [https://github.com/Feh/nocache](url). There's also a means to use a cgroup there to put a resource cap on RPM (or any other application) memory usage.

Perhaps the group scripting can be use with rpm lib: todo++.

Meanwhile rsync backups have a similar effect to your RPM issue. Both rpm/rsync have huge I/O needs that easily cause cache blowout. Recent rsync has not only a solution, but rsync can also use mincore(2) to explicitly verify that no blocks/pages from a file remain in the cache. Ditto, todo++ to add to patch ...


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