Dne 30. 05. 19 v 8:39 Igor Gnatenko napsal(a):
Last time I was about to propose this in F29, I did mass-rebuild myself
and while decompressing was faster in most of the cases, the size was
definitely worse. So definitely "Lower bandwidth on mirrors if we choose
the highest compression level" is under the question.
My current observation is that compression ratio differs per package,
sometimes xz.2 wins, sometimes it's zstd.19.
The data I initially picked compresses better with zstd, while
recompiled RPMs that are installed in fedora:30 docker image have almost
equal size.
BTW, which compression level did you use?
Could you share some of your observations and stats if you still have them?
I think before approving such changes, owners need to do mass rebuilds
on their own and provide a graph of changes in size between original
compression format and new one(s).
Doing that equals to the mass rebuild.
I'd rather do an analysis and if the numbers look sane, I'd prefer doing
a mass rebuild in a side tag so we can use the builds if the results are
sane. Hammering koji with so many scratch builds doesn't sound right to me.
Just saying it works better on Firefox doesn't sound to me like the way
to go.
Firefox was an example.
The other table shows real-life data based on RPMs available on Fedora
LiveCD.
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