Golang map and Java HashMap Performance comparison

This is a creation in Article, where the information may have evolved or changed.

Performance comparison

Insert 10 million records to compare memory usage size and insertion time.

Test machine configuration

Intel (R) Core (TM) i3-4000m CPU @2.40ghz 2.40GHz

12.0GB Memory

Front-facing conditions

Go, avoid the memory copy when expanding capacity, the size of the initialization volume is 13333333. Make (map[int]int,13333333)

Java, avoid memory copy when expanding capacity, the size of initialization volume is 13333333. New HashMap (13333333);

Avoid oom, set JVM parameters-xms2048m-xmx2048m

Use the size of the memory

Go 300M

Java 800M

Time-consuming (nanosecond)

Go put map,duration:2655163300 NS

Java put map,duration:1543360398 NS

Code

Golang

T1:=time. Now ();

M1:=make (map[int]int,13333333)

For i:=0;i<10000000;i++{

M1[i]=i

}

T2:=time. Now ();

Fmt. Printf ("Put map,duration::%d ns\n", T2. Sub (t1))

Java

System.GC ();

Long T1 = System.nanotime ();

Map map = new hashmap<> (13333333);

for (int i=0;i<10000000;i++) {

Map.put (i, I);

}

Long t2 = System.nanotime ();

System.out.println ("Put map,duration:" + (T2-T1) + "ns");