Giraph 内存测试

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package memory;import java.io.IOException;import org.apache.giraph.utils.ExtendedByteArrayDataOutput;import org.apache.giraph.utils.ExtendedDataOutput;import org.apache.hadoop.io.FloatWritable;public class MemoryTest {/** * @param args */public static void main(String[] args) {Runtime rt = Runtime.getRuntime();ExtendedDataOutput extend = new ExtendedByteArrayDataOutput();System.out.println("Pos: " + extend.getPos() + " Total Memory = "+ rt.totalMemory() + " Used Memory = "+ (rt.totalMemory() - rt.freeMemory()));try {for (int i = 0; i < 100000; i++) {new FloatWritable(i).write(extend);}} catch (IOException e) {e.printStackTrace();}System.out.println("Pos: " + extend.getPos() + " Total Memory = "+ rt.totalMemory() + " Used Memory = "+ (rt.totalMemory() - rt.freeMemory()));}}

结果:

Pos: 0 Total Memory = 127991808 Used Memory = 2684032Pos: 400000 Total Memory = 127991808 Used Memory = 10075640

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