Major Clojure 1.10 performance degredation on JDK11
rlb at defaultvalue.org
Sun Feb 10 08:30:16 GMT 2019
Alex Miller <alex at puredanger.com> writes:
> If not, why not?
It was originally caused by a bug in dh_strip_nondeterminism which is
part of Debian's work toward reproducible builds
Of course it'll be much better if/when projects are just reproducible
upstream as a matter of course, but my understanding is that's still
quite a way off.
> I think it's almost certainly this issue with clj / class timestamps.
> afaik, nothing was ever filed about this in the Clojure ticket system.
Makes sense -- It wasn't a Clojure issue. The debhelper bug was fixed,
and still apears to be, at least with respect to Debian's 1.8 package:
$ dpkg --status clojure1.8 | grep Version
$ time clojure1.8 -e ''
Offhand I'd guess that either there's just some new issue, or perhaps
there are jars that were built with the older version of
dh_strip_notdeterminism lingering and getting in the way somehow.
For what it's worth, I think the fix did something to make it so that
the class timestamps would be at least a second newer than the clj
timestamps (while still deterministic), and if I recall correctly, Chris
Lamb came up with the fix.
rlb @defaultvalue.org and @debian.org
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