Bug#877418: dh-strip-nondeterminism: kills clojure performance

[Rob Browning]

Package: dh-strip-nondeterminism
Version: 0.034-1

I noticed that Debian's clojure-1.8.0.jar had terrible performance as
compared to both the upstream jar and one built manually via the "mvn
package" or ant process, and after some investigation, I think I've
tracked it down to dh-strip-nondeterminism.

Given the current clojure 1.8.0-2 source tree, adding this to
debian/rules:

  # Ask clojure to do nothing
  define timeclj
    time java -cp debian/libclojure-java/usr/share/java/clojure-1.8.0.jar \
      clojure.main -e ''
  endef

  override_dh_strip_nondeterminism:
          $(timeclj)
          dh_strip_nondeterminism
          $(timeclj)

and then running "fakeroot debian/rules binary" produces this:

  time java -cp debian/libclojure-java/usr/share/java/clojure-1.8.0.jar clojure.main -e ''

  real    0m0.919s
  user    0m1.739s
  sys     0m0.064s
  dh_strip_nondeterminism
  time java -cp debian/libclojure-java/usr/share/java/clojure-1.8.0.jar clojure.main -e ''

  real    0m4.064s
  user    0m12.204s
  sys     0m0.140s

Thanks
-- 
Rob Browning
rlb @defaultvalue.org and @debian.org
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