Read a File as fast as possible with High speed

I compare 3 algorithms to read file from groovy.

TODO: Compare with JAVA

: Measure memory heap

In order to run all tests, I'm using a closure to evaluate the runtime.

def benchmark = { closure ->  
start = System.currentTimeMillis()  
closure.call()  
now = System.currentTimeMillis()  
now - start  
}

def index = 0
file.eachLine(startLine){ line ->
		   content.add line
		   index++
		   if(index > (endLine - startLine)) // Out of range
			   return
}

content2 = file.readLines().getAt(startLine..endLine)

def number = 0
	file.eachLine { line ->
	   number++
 
	   if(number > startLine)
		   content.add line
 
	   if(number > endLine)
		   return
	}

/***
 * How to read a file as fast as possible
 * 
 * @author vicben01
 */
 
def benchmark = { closure ->  
start = System.currentTimeMillis()  
closure.call()  
now = System.currentTimeMillis()  
now - start  
}
 
// Configuration
def file = new File ('CellBuilder_2010_06_29_20_01_17_012.log')
 
def startLine = 500
//def endLine = 2000
 
for(endLine in [502, 800, 1000, 2000,10000,24000]){
	println ">> read ${endLine - startLine} lines"
/***
 * 
 */
// Algo 3
def content = []
def duration = benchmark {  
def index = 0
file.eachLine(startLine){ line ->
		   content.add line
		   index++
		   if(index > (endLine - startLine)) // Out of range
			   return
}
}
content = null
println "1> execution took ${duration} ms / ${(endLine - startLine)} lines = ${duration / (endLine - startLine) }"
sleep(500)
 
// Algo 2
def content2 = []
def duration2 = benchmark { 
	content2 = file.readLines().getAt(startLine..endLine)
}
//assert content2.size() == (endLine - startLine)
content2 = null
println "2> execution took ${duration2} ms / ${(endLine - startLine)} lines = ${duration2 / (endLine - startLine) }"
sleep(500)
// Algo 1
def content3 = []
def duration3 = benchmark {  
	def number = 0
	file.eachLine { line ->
	   number++
 
	   if(number > startLine)
		   content3.add line
 
	   if(number > endLine)
		   return
	}
}
//assert content.size() == (endLine - startLine)
content3 = null
println "3> execution took ${duration3} ms / ${(endLine - startLine)} lines = ${duration3 / (endLine - startLine) }"
sleep(500)
// TODO: compute means	
}