benchmark("hllc")(10000000)(hcclcodeanddecode)
def hcclcodeanddecode() :Unit = {
val hllc = new HLLCounter(14)
hllc.add("adsfasdfawerwfadfs")
val bytes1 = ByteBuffer.allocate(hllc.maxLength())
hllc.writeRegisters(bytes1)
val aa = bytes1.array
val hllc2 = new HLLCounter(14)
val t = hllc2.readRegisters(ByteBuffer.wrap(aa))
// val count = hllc2.getCountEstimate
}
def hcclcodeanddecode2(x:String) :Unit = {
val hllc = new HLLCounter(14)
hllc.add("adsfasdfawerwfadfs")
val bytes1 = ByteBuffer.allocate(hllc.maxLength())
hllc.writeRegisters(bytes1)
val aa = bytes1.array
val hllc2 = new HLLCounter(14)
val t = hllc2.readRegisters(ByteBuffer.wrap(aa))
// val count = hllc2.getCountEstimate
}
def benchmark(name: String)(count: Int)(f
)=>Unit) = {
val b = System.currentTimeMillis()
println(s"name $name")
println(s"count $count")
for (i <- 0 to count) f()
// for (i <- 0 to count) f f 不带括号， f 函数并不会执行
val e = System.currentTimeMillis()
println(s"cost ${e-b}")
}
def benchmark2(name: String)(count: Int)(f
String)=>Unit) = {
val b = System.currentTimeMillis()
println(s"name $name")
println(s"count $count")
for (i <- 0 to count) f(name)
val e = System.currentTimeMillis()
println(s"cost ${e-b}")
}
(f
)=>Unit) 这种写法 OK