increase branching factor to 16

pmap.go

@@ -1,8 +1,13 @@
 package pmap
 
-const deg = 8 // branch factor of nodes
-const log2deg = 3
-const mask = 0b111
+import (
+	"fmt"
+	"math/bits"
+)
+
+const deg = 16 // branch factor of nodes
+const log2deg = 4
+const mask = 0b1111
 
 type Key = interface{}
 type Value = interface{}
@@ -80,8 +85,10 @@ func (p pmap) Del(k Key) Map {
 }
 
 func hash(k Key) uint32 {
-	u := k.(int)
-	return uint32(uint(u) + uint(u)>>32)
+	//u := uint(k.(int))*6364136223846793005 + 1
+	//return uint32(u >> 32)
+	u := uint(k.(int))
+	return uint32(u + u>>32)
 }
 
 func (m *node) getNode(shift, hash uint32, key Key) interface{} {