[Rpm-maint] [rpm-software-management/rpm] Adding an LMDB backend to RPM (#281)

Jeff Johnson notifications at github.com
Fri Jul 28 20:32:20 UTC 2017

One last comparison: RPM5 uses BerkeleyDB too, but with different tunables than RPM4.

Here's essentially the same measurement as the previous comment:
1.15user 0.87system 0:02.11elapsed 96%CPU (0avgtext+0avgdata 584900maxresident)k
240inputs+390776outputs (7major+355303minor)pagefaults 0swaps

I add this comment to squelch BerkeleyDB haters from taking my measurements and claiming

```"LMDB is Newer! Better! Faster! than BDB."```

I suspect the tunable that makes a huge difference is mmapsize (RPM5 sets this to 256Mb).

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