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author | Paul Phillips <paulp@improving.org> | 2010-10-11 23:18:19 +0000 |
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committer | Paul Phillips <paulp@improving.org> | 2010-10-11 23:18:19 +0000 |
commit | 4215f6bd7d6895e400062c22d80a7ccfab20ff23 (patch) | |
tree | 236d0513c1f5917ee7eab67df7242c3ea9f2d203 /test/files | |
parent | e5c22d9e0a11f0c1a0d29520f7420d709fb174ec (diff) | |
download | scala-4215f6bd7d6895e400062c22d80a7ccfab20ff23.tar.gz scala-4215f6bd7d6895e400062c22d80a7ccfab20ff23.tar.bz2 scala-4215f6bd7d6895e400062c22d80a7ccfab20ff23.zip |
Introduced -Ymurmur with murmur hashcodes.
contributed by "archontophoenix", following in the grand tradition of
code by people whose actual names I don't know. References #2537, but it
doesn't close until some sensible hashcode is used by default. Review by
community.
Diffstat (limited to 'test/files')
-rw-r--r-- | test/files/run/hashCodeDistribution.flags | 1 | ||||
-rw-r--r-- | test/files/run/hashCodeDistribution.scala | 17 |
2 files changed, 18 insertions, 0 deletions
diff --git a/test/files/run/hashCodeDistribution.flags b/test/files/run/hashCodeDistribution.flags new file mode 100644 index 0000000000..5f7bd1a5be --- /dev/null +++ b/test/files/run/hashCodeDistribution.flags @@ -0,0 +1 @@ +-Ymurmur
\ No newline at end of file diff --git a/test/files/run/hashCodeDistribution.scala b/test/files/run/hashCodeDistribution.scala new file mode 100644 index 0000000000..5be9d1db6d --- /dev/null +++ b/test/files/run/hashCodeDistribution.scala @@ -0,0 +1,17 @@ +// See ticket #2537. +object Test { + case class C(x: Int, y: Int) { } + val COUNT = 300 + val totalCodes = COUNT * COUNT + + def main (args: Array[String]) = { + val hashCodes = + for (x <- 0 until COUNT; y <- 0 until COUNT) yield C(x,y).hashCode + + val uniques = hashCodes.distinct + val collisionRate = (totalCodes - uniques.size) * 1000 / totalCodes + + assert(collisionRate < 5, "Collision rate too high: %d / 1000".format(collisionRate)) + // println("collisionRate = %d / 1000".format(collisionRate)) + } +}
\ No newline at end of file |