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Merge pull request #103 from amplab/optimizations

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Optimizations cherry-picked from SIGMOD branches
This commit is contained in:
Reynold Xin 2013-12-15 17:25:33 -08:00
parent 8a56c1ff67 bad85b051d
commit ded10ce5b0
2 changed files with 35 additions and 12 deletions
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3
core/src/main/scala/org/apache/spark/util/collection/OpenHashSet.scala
View file

@ -249,8 +249,7 @@ class OpenHashSet[@specialized(Long, Int) T: ClassManifest](
* in the lower bits, similar to java.util.HashMap
*/
private def hashcode(h: Int): Int = {
val r = h ^ (h >>> 20) ^ (h >>> 12)
r ^ (r >>> 7) ^ (r >>> 4)
it.unimi.dsi.fastutil.HashCommon.murmurHash3(h)
}
private def nextPowerOf2(n: Int): Int = {

44
graph/src/main/scala/org/apache/spark/graph/impl/Serializers.scala
View file

@ -295,7 +295,7 @@ abstract class ShuffleDeserializationStream(s: InputStream) extends Deserializat
var i: Int = 0
def readOrThrow(): Int = {
val in = s.read()
if (in < 0) throw new java.io.EOFException
if (in < 0) throw new EOFException
in & 0xFF
}
var b: Int = readOrThrow()
@ -309,21 +309,45 @@ abstract class ShuffleDeserializationStream(s: InputStream) extends Deserializat
}
def readVarLong(optimizePositive: Boolean): Long = {
// TODO: unroll the while loop.
var value: Long = 0L
def readOrThrow(): Int = {
val in = s.read()
if (in < 0) throw new java.io.EOFException
if (in < 0) throw new EOFException
in & 0xFF
}
var i: Int = 0
var b: Int = readOrThrow()
while (i < 56 && (b & 0x80) != 0) {
value |= (b & 0x7F).toLong << i
i += 7
var b = readOrThrow()
var ret: Long = b & 0x7F
if ((b & 0x80) != 0) {
b = readOrThrow()
ret |= (b & 0x7F) << 7
if ((b & 0x80) != 0) {
b = readOrThrow()
ret |= (b & 0x7F) << 14
if ((b & 0x80) != 0) {
b = readOrThrow()
ret |= (b & 0x7F) << 21
if ((b & 0x80) != 0) {
b = readOrThrow()
ret |= (b & 0x7F).toLong << 28
if ((b & 0x80) != 0) {
b = readOrThrow()
ret |= (b & 0x7F).toLong << 35
if ((b & 0x80) != 0) {
b = readOrThrow()
ret |= (b & 0x7F).toLong << 42
if ((b & 0x80) != 0) {
b = readOrThrow()
ret |= (b & 0x7F).toLong << 49
if ((b & 0x80) != 0) {
b = readOrThrow()
ret |= b.toLong << 56
}
}
}
}
}
}
}
}
val ret = value | (b.toLong << i)
if (!optimizePositive) (ret >>> 1) ^ -(ret & 1) else ret
}