Recently, C++ and OS changed much, but we still can use malloc with the newest compiler. My test environment is listed in the next section.

//Refer to malloc example at cplusplus.com // gcc this.cpp -l stdc++ -o this.exe #include <stdio.h> #include <stdlib.h> int main () { char * buffer; long long size = 2ll; do { //printf("Size = %d \n",size); printf("Size = %llu \n",size); buffer = (char *)malloc(size); size = size*2ll; if (buffer != NULL) { delete buffer; buffer = NULL; } else { printf ("Allocation failed.\n"); break; } } while (size <= 1024ll*1024ll*1024ll*1024ll); } /* Result on my 8G laptop $ ./StressMalloc.exe Size = 2 Size = 4 Size = 8 Size = 16 Size = 32 Size = 64 Size = 128 Size = 256 Size = 512 Size = 1024 Size = 2048 Size = 4096 Size = 8192 Size = 16384 Size = 32768 Size = 65536 Size = 131072 Size = 262144 Size = 524288 Size = 1048576 Size = 2097152 Size = 4194304 Size = 8388608 Size = 16777216 Size = 33554432 Size = 67108864 Size = 134217728 Size = 268435456 Size = 536870912 Size = 1073741824 Size = 2147483648 Size = 4294967296 Size = 8589934592 Size = 17179869184 Allocation failed. */

We have to alternate the procedure of the JNI tutorial post in Wikipedia as the following.

REFERENCE http://en.wikipedia.org/wiki/java_native_interface for jni reenact procedure. limited modification by zhikai wang/www.heteroclinic.net for evaluation, comment and criticism. INFRASTRUCTURE $ uname -r 2.6.32-504.3.3.el6.x86_64 $ env | grep PATH PATH=/usr/lib64/qt-3.3/bin:/opt/gradle-2.0/bin:/opt/scala-2.11.0/bin:/opt/apache-maven-3.2.1/bin:/opt/apache-ant-1.9.3/bin:/opt/eclipse:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/zhikai/bin $ gcc -v Using built-in specs. Target: x86_64-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre --enable-libgcj-multifile --enable-java-maintainer-mode --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib --with-ppl --with-cloog --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux Thread model: posix gcc version 4.4.7 20120313 (Red Hat 4.4.7-11) (GCC) TUTORIAL $cat >> HelloWorld.java << EOF class HelloWorld { private native void print(); public static void main(String[] args) { new HelloWorld().print(); } static{ System.loadLibrary("HelloWorld"); } } EOF $cat >> libHelloWorld.c << EOF #include <stdio.h> #include "HelloWorld.h" JNIEXPORT void JNICALL Java_HelloWorld_print(JNIEnv *env, jobject obj) { printf("Hello World!\n"); return; } EOF $export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:. $javac HelloWorld.java $javah HelloWorld $gcc -fPIC -I${JAVA_HOME}/include -I${JAVA_HOME}/include/linux -shared libHelloWorld.c -o libHelloWorld.so $ ls HelloWorld.class HelloWorld.h HelloWorld.java JNInotes libHelloWorld.c libHelloWorld.so RESULT $ java HelloWorld Hello World!

I tried to branch the JNI tutorial and use a different set of variables names and class names. But due to some modifications wrong with the machine generated code, I just hacked directedly the HellowWorld tutorial. In the before section, we know, even it is from Wikipedia (to some sense, much peer reviewed), engineering is still a fitting circle to square practice.

#include <stdio.h> #include <stdlib.h> #include "HelloWorld.h" JNIEXPORT void JNICALL Java_HelloWorld_print(JNIEnv *env, jobject obj) { char * buffer; long long size = 2ll; do { printf("Size = %llu \n",size); buffer = (char *)malloc(size); size = size*2ll; if (buffer != NULL) { delete buffer; buffer = NULL; } else { printf ("Allocation failed.\n"); break; } } while (size <= 1024ll*1024ll*1024ll*1024ll); return; }

$gcc -fPIC -I${JAVA_HOME}/include -I${JAVA_HOME}/include/linux -shared libHelloWorld.cpp -l stdc++ -o libHelloWorld.so $ java -Xmx32M -XX:PermSize=8m -XX:MaxPermSize=8M -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:ParallelCMSThreads=2 HelloWorld Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=8m; support was removed in 8.0 Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=8M; support was removed in 8.0 Size = 2 Size = 4 Size = 8 Size = 16 Size = 32 Size = 64 Size = 128 Size = 256 Size = 512 Size = 1024 Size = 2048 Size = 4096 Size = 8192 Size = 16384 Size = 32768 Size = 65536 Size = 131072 Size = 262144 Size = 524288 Size = 1048576 Size = 2097152 Size = 4194304 Size = 8388608 Size = 16777216 Size = 33554432 Size = 67108864 Size = 134217728 Size = 268435456 Size = 536870912 Size = 1073741824 Size = 2147483648 Size = 4294967296 Size = 8589934592 Size = 17179869184 Allocation failed. Heap PSYoungGen total 1024K, used 382K [0x00000000ff580000, 0x00000000ff700000, 0x0000000100000000) eden space 512K, 74% used [0x00000000ff580000,0x00000000ff5df858,0x00000000ff600000) from space 512K, 0% used [0x00000000ff680000,0x00000000ff680000,0x00000000ff700000) to space 512K, 0% used [0x00000000ff600000,0x00000000ff600000,0x00000000ff680000) ParOldGen total 22016K, used 0K [0x00000000fe000000, 0x00000000ff580000, 0x00000000ff580000) object space 22016K, 0% used [0x00000000fe000000,0x00000000fe000000,0x00000000ff580000) Metaspace used 2383K, capacity 4486K, committed 4864K, reserved 1056768K class space used 259K, capacity 386K, committed 512K, reserved 1048576K

This excercise shows when running JNI malloc, the vm settings of memory constraints do not apply to the native code in execution.

We continue the engineering of null pointer exception. If memory allocation is not properly handled, the error is neglected/eaten up in a complex program structure, deep in the thread or delegate stack, it may emerge and make even a single thread program demonstrate random or choatic behavior. The following snippet shows the NullPointerException may happen at given points but randomly in a single thread program. Please note this behavior does not limit to Java, in fact, any program without proper transaction design, tuning/profiling (producer consumer), as far I jumped to some at my C codes, will demonstrate such behavior. For short, to engineer the working condition of a product, but beyond the scope of this disucssion, is not this discussed here.

Source Code
import java.util.LinkedHashMap; import java.util.Map; import java.util.UUID; import java.util.concurrent.TimeUnit; public class SimpleGCTest { public static void testSuite1 () throws InterruptedException { final int outerLoop = 100000; final int mapSize = 1000; final long sleepIntervalInMills = 10; Map<String, Map> topMap = new LinkedHashMap<String, Map> (); int newFailureCounter = 0; final int newFailureLoopLimit = 10; loop1: for (int i = 0; i< outerLoop ; i++) { int nullCounter = 0; Map<String, String> tmpMap = null; try { tmpMap = new LinkedHashMap<String, String> (); } catch (Throwable t1) { if (t1 instanceof OutOfMemoryError) { newFailureCounter++; } else { } System.out.println(t1.toString()); t1.printStackTrace(); } loop2: for (int j = 0 ; j<mapSize; j++) { String s = null; try { s = new String (Integer.toString(j)); tmpMap.put(s, s); // We expect NPE could happen here. } catch (Throwable t1) { if (t1 instanceof OutOfMemoryError) { newFailureCounter++; } else { } System.out.println(t1.toString()); System.out.println(s.toString()); t1.printStackTrace(); } if (newFailureCounter >= newFailureLoopLimit) { System.out.println("New failures reach limit, exit"); break loop1; } } topMap.put(""+i,tmpMap);//or NPE here, no this is immediate address. if (newFailureCounter >= newFailureLoopLimit) { System.out.println("New failures reach limit, exit"); break loop1; } } } public static void main(String[] args) throws InterruptedException { // echo > log.txt && java -Xmx32M -XX:PermSize=8m -XX:MaxPermSize=8M -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:ParallelCMSThreads=2 SimpleGCTest testSuite1(); // log1.txt } }

How to:
javac SimpleGCTest.java java -Xmx32M -XX:PermSize=8m -XX:MaxPermSize=8M -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:ParallelCMSThreads=2 SimpleGCTest

Gathered data sample one and two, you may have different resuts:
$ java -Xmx32M -XX:PermSize=8m -XX:MaxPermSize=8M -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:ParallelCMSThreads=2 SimpleGCTest Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=8m; support was removed in 8.0 Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=8M; support was removed in 8.0 0.057: [GC (Allocation Failure) [PSYoungGen: 512K->448K(1024K)] 512K->456K(23040K), 0.0013704 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 0.062: [GC (Allocation Failure) [PSYoungGen: 960K->496K(1536K)] 968K->748K(23552K), 0.0025395 secs] [Times: user=0.00 sys=0.01, real=0.00 secs] 0.069: [GC (Allocation Failure) [PSYoungGen: 1520K->496K(1536K)] 1772K->1516K(23552K), 0.0028135 secs] [Times: user=0.01 sys=0.00, real=0.01 secs] 0.074: [GC (Allocation Failure) [PSYoungGen: 1520K->496K(2560K)] 2540K->2324K(24576K), 0.0026793 secs] [Times: user=0.01 sys=0.00, real=0.00 secs] 0.081: [GC (Allocation Failure) [PSYoungGen: 2544K->512K(2560K)] 4372K->3860K(24576K), 0.0034518 secs] [Times: user=0.02 sys=0.00, real=0.00 secs] 0.089: [GC (Allocation Failure) [PSYoungGen: 2560K->2096K(6144K)] 5908K->5444K(28160K), 0.0041720 secs] [Times: user=0.01 sys=0.00, real=0.01 secs] 0.100: [GC (Allocation Failure) [PSYoungGen: 5680K->3072K(6656K)] 9028K->8108K(28672K), 0.0074995 secs] [Times: user=0.02 sys=0.00, real=0.01 secs] 0.111: [GC (Allocation Failure) [PSYoungGen: 6656K->3584K(7168K)] 11692K->10805K(29184K), 0.0081894 secs] [Times: user=0.03 sys=0.01, real=0.00 secs] 0.123: [GC (Allocation Failure) [PSYoungGen: 7168K->3584K(7168K)] 14389K->13517K(29184K), 0.0076470 secs] [Times: user=0.02 sys=0.00, real=0.01 secs] 0.133: [GC (Allocation Failure) [PSYoungGen: 7168K->3584K(7168K)] 17101K->16246K(29184K), 0.0063333 secs] [Times: user=0.02 sys=0.00, real=0.00 secs] 0.142: [GC (Allocation Failure) [PSYoungGen: 7168K->2784K(7168K)] 19830K->18990K(29184K), 0.0090537 secs] [Times: user=0.03 sys=0.00, real=0.01 secs] 0.154: [GC (Allocation Failure) [PSYoungGen: 6368K->2752K(7168K)] 22574K->21671K(29184K), 0.0171988 secs] [Times: user=0.04 sys=0.00, real=0.02 secs] 0.171: [Full GC (Ergonomics) [PSYoungGen: 2752K->0K(7168K)] [ParOldGen: 18919K->21387K(22016K)] 21671K->21387K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.3014560 secs] [Times: user=1.07 sys=0.01, real=0.30 secs] 0.475: [Full GC (Ergonomics) [PSYoungGen: 3584K->2303K(7168K)] [ParOldGen: 21387K->21766K(22016K)] 24971K->24070K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0688944 secs] [Times: user=0.24 sys=0.00, real=0.07 secs] 0.545: [Full GC (Ergonomics) [PSYoungGen: 3584K->3262K(7168K)] [ParOldGen: 21766K->21766K(22016K)] 25350K->25028K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0558906 secs] [Times: user=0.16 sys=0.00, real=0.06 secs] 0.601: [Full GC (Ergonomics) [PSYoungGen: 3584K->3502K(7168K)] [ParOldGen: 21766K->21766K(22016K)] 25350K->25269K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0461289 secs] [Times: user=0.17 sys=0.00, real=0.04 secs] 0.647: [Full GC (Ergonomics) [PSYoungGen: 3584K->3564K(7168K)] [ParOldGen: 21766K->21766K(22016K)] 25350K->25330K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0523724 secs] [Times: user=0.17 sys=0.00, real=0.05 secs] 0.700: [Full GC (Ergonomics) [PSYoungGen: 3584K->3579K(7168K)] [ParOldGen: 21766K->21766K(22016K)] 25350K->25346K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0499326 secs] [Times: user=0.14 sys=0.00, real=0.05 secs] 0.750: [Full GC (Ergonomics) [PSYoungGen: 3584K->3583K(7168K)] [ParOldGen: 21766K->21766K(22016K)] 25350K->25349K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0518067 secs] [Times: user=0.17 sys=0.00, real=0.06 secs] 0.802: [Full GC (Ergonomics) [PSYoungGen: 3584K->3583K(7168K)] [ParOldGen: 21766K->21766K(22016K)] 25350K->25350K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0475238 secs] [Times: user=0.17 sys=0.00, real=0.04 secs] 0.849: [Full GC (Ergonomics) [PSYoungGen: 3584K->3583K(7168K)] [ParOldGen: 21766K->21766K(22016K)] 25350K->25350K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0505820 secs] [Times: user=0.15 sys=0.01, real=0.06 secs] 0.900: [Full GC (Ergonomics) [PSYoungGen: 3584K->3583K(7168K)] [ParOldGen: 21766K->21766K(22016K)] 25350K->25350K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0471589 secs] [Times: user=0.18 sys=0.00, real=0.04 secs] 0.947: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21768K->21768K(22016K)] 25352K->25352K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0492395 secs] [Times: user=0.14 sys=0.00, real=0.05 secs] 0.997: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21769K->21769K(22016K)] 25353K->25353K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0522457 secs] [Times: user=0.17 sys=0.00, real=0.05 secs] 1.049: [Full GC (Ergonomics) [PSYoungGen: 3583K->3579K(7168K)] [ParOldGen: 21779K->21778K(22016K)] 25363K->25358K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0565552 secs] [Times: user=0.16 sys=0.00, real=0.06 secs] 1.106: [Full GC (Ergonomics) [PSYoungGen: 3584K->3583K(7168K)] [ParOldGen: 21778K->21778K(22016K)] 25362K->25361K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0476320 secs] [Times: user=0.17 sys=0.00, real=0.05 secs] 1.154: [Full GC (Ergonomics) [PSYoungGen: 3584K->3583K(7168K)] [ParOldGen: 21778K->21778K(22016K)] 25362K->25362K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0544268 secs] [Times: user=0.17 sys=0.00, real=0.05 secs] 1.208: [Full GC (Ergonomics) [PSYoungGen: 3584K->3583K(7168K)] [ParOldGen: 21778K->21778K(22016K)] 25362K->25362K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0453775 secs] [Times: user=0.13 sys=0.00, real=0.05 secs] 1.254: [Full GC (Ergonomics) [PSYoungGen: 3584K->3583K(7168K)] [ParOldGen: 21778K->21778K(22016K)] 25362K->25362K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0518096 secs] [Times: user=0.15 sys=0.00, real=0.05 secs] 1.306: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21778K->21778K(22016K)] 25362K->25362K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0674852 secs] [Times: user=0.22 sys=0.00, real=0.07 secs] 1.373: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21780K->21780K(22016K)] 25364K->25364K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0508631 secs] [Times: user=0.16 sys=0.00, real=0.05 secs] 1.424: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21782K->21781K(22016K)] 25365K->25365K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0500121 secs] [Times: user=0.17 sys=0.00, real=0.05 secs] 1.474: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21783K->21783K(22016K)] 25367K->25366K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0556423 secs] [Times: user=0.18 sys=0.00, real=0.05 secs] 1.530: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21784K->21784K(22016K)] 25368K->25368K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0525647 secs] [Times: user=0.15 sys=0.00, real=0.05 secs] 1.583: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21786K->21785K(22016K)] 25370K->25369K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0539081 secs] [Times: user=0.16 sys=0.00, real=0.05 secs] 1.637: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21787K->21787K(22016K)] 25371K->25371K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0530024 secs] [Times: user=0.17 sys=0.00, real=0.06 secs] 1.690: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21788K->21788K(22016K)] 25372K->25372K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0474302 secs] [Times: user=0.18 sys=0.00, real=0.04 secs] 1.738: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21790K->21789K(22016K)] 25374K->25373K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0498065 secs] [Times: user=0.14 sys=0.00, real=0.05 secs] 1.788: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21791K->21791K(22016K)] 25375K->25375K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0438812 secs] [Times: user=0.15 sys=0.00, real=0.05 secs] 1.832: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21793K->21792K(22016K)] 25376K->25376K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0464579 secs] [Times: user=0.14 sys=0.00, real=0.04 secs] 1.878: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21794K->21794K(22016K)] 25378K->25377K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0471476 secs] [Times: user=0.18 sys=0.00, real=0.05 secs] 1.925: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21795K->21795K(22016K)] 25379K->25379K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0523533 secs] [Times: user=0.15 sys=0.00, real=0.05 secs] 1.978: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21797K->21796K(22016K)] 25381K->25380K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0482051 secs] [Times: user=0.14 sys=0.00, real=0.05 secs] 2.026: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21798K->21798K(22016K)] 25382K->25382K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0518406 secs] [Times: user=0.17 sys=0.00, real=0.05 secs] 2.078: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21800K->21799K(22016K)] 25384K->25383K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0464719 secs] [Times: user=0.15 sys=0.00, real=0.05 secs] 2.125: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21801K->21801K(22016K)] 25385K->25385K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0513075 secs] [Times: user=0.18 sys=0.00, real=0.05 secs] 2.176: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21803K->21802K(22016K)] 25387K->25386K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0447832 secs] [Times: user=0.14 sys=0.00, real=0.05 secs] 2.221: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21805K->21804K(22016K)] 25389K->25388K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0481329 secs] [Times: user=0.17 sys=0.00, real=0.04 secs] 2.270: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21806K->21805K(22016K)] 25390K->25389K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0497171 secs] [Times: user=0.16 sys=0.00, real=0.05 secs] 2.319: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21807K->21807K(22016K)] 25391K->25391K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0499304 secs] [Times: user=0.17 sys=0.00, real=0.05 secs] 2.370: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21809K->21808K(22016K)] 25393K->25392K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0476471 secs] [Times: user=0.14 sys=0.00, real=0.05 secs] 2.417: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21810K->21810K(22016K)] 25394K->25394K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0458572 secs] [Times: user=0.16 sys=0.01, real=0.05 secs] 2.463: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21811K->21811K(22016K)] 25395K->25395K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0473651 secs] [Times: user=0.15 sys=0.00, real=0.05 secs] 2.511: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21815K->21813K(22016K)] 25399K->25397K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0614676 secs] [Times: user=0.20 sys=0.00, real=0.06 secs] 2.573: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21815K->21792K(22016K)] 25399K->25376K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0978564 secs] [Times: user=0.33 sys=0.00, real=0.10 secs] 2.671: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21795K->21793K(22016K)] 25379K->25377K(29184K), [Metaspace: 2396K->2396K(1056768K)], 0.0974510 secs] [Times: user=0.35 sys=0.00, real=0.09 secs] java.lang.OutOfMemoryError: GC overhead limit exceeded Exception in thread "main" java.lang.NullPointerException 2.769: [Full GC (Ergonomics) [PSYoungGen: 3583K->0K(7168K)] [ParOldGen: 21796K->233K(6656K)] 25380K->233K(13824K), [Metaspace: 2421K->2421K(1056768K)], 0.0033405 secs] [Times: user=0.01 sys=0.00, real=0.01 secs] at SimpleGCTest.testSuite1(SimpleGCTest.java:38) at SimpleGCTest.main(SimpleGCTest.java:58) Heap PSYoungGen total 7168K, used 74K [0x00000000ff580000, 0x0000000100000000, 0x0000000100000000) eden space 3584K, 2% used [0x00000000ff580000,0x00000000ff592848,0x00000000ff900000) from space 3584K, 0% used [0x00000000ffc80000,0x00000000ffc80000,0x0000000100000000) to space 3584K, 0% used [0x00000000ff900000,0x00000000ff900000,0x00000000ffc80000) ParOldGen total 6656K, used 233K [0x00000000fe000000, 0x00000000fe680000, 0x00000000ff580000) object space 6656K, 3% used [0x00000000fe000000,0x00000000fe03a628,0x00000000fe680000) Metaspace used 2427K, capacity 4486K, committed 4864K, reserved 1056768K class space used 263K, capacity 386K, committed 512K, reserved 1048576K $ java -Xmx32M -XX:PermSize=8m -XX:MaxPermSize=8M -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:ParallelCMSThreads=2 SimpleGCTest Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=8m; support was removed in 8.0 Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=8M; support was removed in 8.0 0.052: [GC (Allocation Failure) [PSYoungGen: 512K->448K(1024K)] 512K->456K(23040K), 0.0011681 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 0.056: [GC (Allocation Failure) [PSYoungGen: 960K->512K(1536K)] 968K->752K(23552K), 0.0016392 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 0.065: [GC (Allocation Failure) [PSYoungGen: 1536K->512K(1536K)] 1776K->1536K(23552K), 0.0018992 secs] [Times: user=0.00 sys=0.00, real=0.01 secs] 0.071: [GC (Allocation Failure) [PSYoungGen: 1536K->496K(2560K)] 2560K->2300K(24576K), 0.0020451 secs] [Times: user=0.01 sys=0.00, real=0.00 secs] 0.080: [GC (Allocation Failure) [PSYoungGen: 2544K->512K(2560K)] 4348K->3840K(24576K), 0.0060204 secs] [Times: user=0.01 sys=0.01, real=0.01 secs] 0.089: [GC (Allocation Failure) [PSYoungGen: 2560K->2112K(6144K)] 5888K->5440K(28160K), 0.0033510 secs] [Times: user=0.01 sys=0.00, real=0.00 secs] 0.099: [GC (Allocation Failure) [PSYoungGen: 5696K->3072K(6656K)] 9024K->8128K(28672K), 0.0063057 secs] [Times: user=0.02 sys=0.00, real=0.00 secs] 0.108: [GC (Allocation Failure) [PSYoungGen: 6656K->3584K(7168K)] 11712K->10817K(29184K), 0.0066872 secs] [Times: user=0.02 sys=0.00, real=0.00 secs] 0.119: [GC (Allocation Failure) [PSYoungGen: 7168K->3584K(7168K)] 14401K->13521K(29184K), 0.0067485 secs] [Times: user=0.02 sys=0.00, real=0.01 secs] 0.128: [GC (Allocation Failure) [PSYoungGen: 7168K->3584K(7168K)] 17105K->16218K(29184K), 0.0093759 secs] [Times: user=0.03 sys=0.01, real=0.01 secs] 0.140: [GC (Allocation Failure) [PSYoungGen: 7168K->2816K(7168K)] 19802K->19042K(29184K), 0.0096115 secs] [Times: user=0.04 sys=0.00, real=0.01 secs] 0.152: [GC (Allocation Failure) [PSYoungGen: 6400K->2720K(7168K)] 22626K->21659K(29184K), 0.0053004 secs] [Times: user=0.02 sys=0.00, real=0.01 secs] 0.157: [Full GC (Ergonomics) [PSYoungGen: 2720K->0K(7168K)] [ParOldGen: 18939K->21383K(22016K)] 21659K->21383K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.2898036 secs] [Times: user=1.10 sys=0.00, real=0.29 secs] 0.449: [Full GC (Ergonomics) [PSYoungGen: 3584K->2304K(7168K)] [ParOldGen: 21383K->21763K(22016K)] 24967K->24068K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0801879 secs] [Times: user=0.25 sys=0.01, real=0.08 secs] 0.530: [Full GC (Ergonomics) [PSYoungGen: 3584K->3262K(7168K)] [ParOldGen: 21763K->21763K(22016K)] 25347K->25026K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0445075 secs] [Times: user=0.17 sys=0.00, real=0.04 secs] 0.575: [Full GC (Ergonomics) [PSYoungGen: 3584K->3502K(7168K)] [ParOldGen: 21763K->21763K(22016K)] 25347K->25266K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0458694 secs] [Times: user=0.18 sys=0.00, real=0.05 secs] 0.621: [Full GC (Ergonomics) [PSYoungGen: 3584K->3564K(7168K)] [ParOldGen: 21763K->21763K(22016K)] 25347K->25327K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0458387 secs] [Times: user=0.17 sys=0.00, real=0.05 secs] 0.667: [Full GC (Ergonomics) [PSYoungGen: 3584K->3579K(7168K)] [ParOldGen: 21763K->21763K(22016K)] 25347K->25343K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0493529 secs] [Times: user=0.14 sys=0.00, real=0.05 secs] 0.716: [Full GC (Ergonomics) [PSYoungGen: 3584K->3583K(7168K)] [ParOldGen: 21763K->21763K(22016K)] 25347K->25346K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0451149 secs] [Times: user=0.15 sys=0.00, real=0.04 secs] 0.762: [Full GC (Ergonomics) [PSYoungGen: 3584K->3583K(7168K)] [ParOldGen: 21763K->21763K(22016K)] 25347K->25347K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0467068 secs] [Times: user=0.17 sys=0.00, real=0.05 secs] 0.808: [Full GC (Ergonomics) [PSYoungGen: 3584K->3583K(7168K)] [ParOldGen: 21763K->21763K(22016K)] 25347K->25347K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0481746 secs] [Times: user=0.15 sys=0.00, real=0.05 secs] 0.857: [Full GC (Ergonomics) [PSYoungGen: 3584K->3583K(7168K)] [ParOldGen: 21763K->21763K(22016K)] 25347K->25347K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0478549 secs] [Times: user=0.14 sys=0.00, real=0.04 secs] 0.905: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21765K->21765K(22016K)] 25349K->25349K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0465688 secs] [Times: user=0.16 sys=0.00, real=0.05 secs] 0.951: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21766K->21766K(22016K)] 25350K->25350K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0459585 secs] [Times: user=0.17 sys=0.00, real=0.05 secs] 0.998: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21768K->21767K(22016K)] 25352K->25351K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0503225 secs] [Times: user=0.14 sys=0.00, real=0.05 secs] 1.048: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21769K->21769K(22016K)] 25353K->25353K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0499134 secs] [Times: user=0.15 sys=0.00, real=0.05 secs] 1.098: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21770K->21770K(22016K)] 25354K->25354K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0560541 secs] [Times: user=0.15 sys=0.00, real=0.05 secs] 1.154: [Full GC (Ergonomics) [PSYoungGen: 3583K->3579K(7168K)] [ParOldGen: 21780K->21779K(22016K)] 25364K->25359K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0589673 secs] [Times: user=0.17 sys=0.00, real=0.06 secs] 1.214: [Full GC (Ergonomics) [PSYoungGen: 3584K->3583K(7168K)] [ParOldGen: 21779K->21779K(22016K)] 25363K->25363K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0511878 secs] [Times: user=0.16 sys=0.00, real=0.05 secs] 1.265: [Full GC (Ergonomics) [PSYoungGen: 3584K->3583K(7168K)] [ParOldGen: 21779K->21779K(22016K)] 25363K->25363K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0440968 secs] [Times: user=0.15 sys=0.00, real=0.05 secs] 1.309: [Full GC (Ergonomics) [PSYoungGen: 3584K->3583K(7168K)] [ParOldGen: 21779K->21779K(22016K)] 25363K->25363K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0445552 secs] [Times: user=0.13 sys=0.00, real=0.04 secs] 1.354: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21779K->21779K(22016K)] 25363K->25363K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0466526 secs] [Times: user=0.17 sys=0.00, real=0.05 secs] 1.401: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21779K->21779K(22016K)] 25363K->25363K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0425226 secs] [Times: user=0.12 sys=0.00, real=0.04 secs] 1.443: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21781K->21781K(22016K)] 25365K->25365K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0469111 secs] [Times: user=0.18 sys=0.00, real=0.05 secs] 1.490: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21783K->21782K(22016K)] 25367K->25366K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0500339 secs] [Times: user=0.15 sys=0.00, real=0.05 secs] 1.541: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21784K->21784K(22016K)] 25368K->25368K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0465463 secs] [Times: user=0.17 sys=0.00, real=0.05 secs] 1.587: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21785K->21785K(22016K)] 25369K->25369K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0511510 secs] [Times: user=0.17 sys=0.00, real=0.05 secs] 1.639: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21787K->21786K(22016K)] 25371K->25370K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0467634 secs] [Times: user=0.14 sys=0.00, real=0.04 secs] 1.685: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21788K->21788K(22016K)] 25372K->25372K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0452477 secs] [Times: user=0.15 sys=0.00, real=0.05 secs] 1.731: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21789K->21789K(22016K)] 25373K->25373K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0462929 secs] [Times: user=0.18 sys=0.00, real=0.05 secs] 1.777: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21791K->21790K(22016K)] 25375K->25374K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0473209 secs] [Times: user=0.18 sys=0.00, real=0.04 secs] 1.825: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21792K->21792K(22016K)] 25376K->25376K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0468557 secs] [Times: user=0.17 sys=0.01, real=0.05 secs] 1.872: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21794K->21793K(22016K)] 25378K->25377K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0533313 secs] [Times: user=0.17 sys=0.00, real=0.05 secs] 1.925: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21795K->21795K(22016K)] 25379K->25379K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0476219 secs] [Times: user=0.14 sys=0.00, real=0.05 secs] 1.973: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21797K->21796K(22016K)] 25380K->25380K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0454847 secs] [Times: user=0.17 sys=0.00, real=0.05 secs] 2.019: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21798K->21798K(22016K)] 25382K->25382K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0440998 secs] [Times: user=0.16 sys=0.00, real=0.04 secs] 2.063: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21800K->21799K(22016K)] 25384K->25383K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0539251 secs] [Times: user=0.17 sys=0.00, real=0.06 secs] 2.117: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21801K->21801K(22016K)] 25385K->25385K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0451344 secs] [Times: user=0.17 sys=0.00, real=0.04 secs] 2.162: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21802K->21802K(22016K)] 25386K->25386K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0459660 secs] [Times: user=0.16 sys=0.00, real=0.05 secs] 2.208: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21805K->21804K(22016K)] 25389K->25388K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0431120 secs] [Times: user=0.16 sys=0.00, real=0.04 secs] 2.251: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21805K->21805K(22016K)] 25389K->25389K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0463851 secs] [Times: user=0.15 sys=0.00, real=0.05 secs] 2.298: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21807K->21806K(22016K)] 25391K->25390K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0454591 secs] [Times: user=0.15 sys=0.00, real=0.04 secs] 2.344: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21808K->21808K(22016K)] 25392K->25392K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0517723 secs] [Times: user=0.14 sys=0.00, real=0.05 secs] 2.395: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21810K->21809K(22016K)] 25394K->25393K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.0478101 secs] [Times: user=0.18 sys=0.00, real=0.05 secs] 2.443: [Full GC (Ergonomics) [PSYoungGen: 3583K->3583K(7168K)] [ParOldGen: 21811K->21788K(22016K)] 25395K->25372K(29184K), [Metaspace: 2394K->2394K(1056768K)], 0.1047579 secs] [Times: user=0.40 sys=0.00, real=0.11 secs] 2.549: [Full GC (Ergonomics) [PSYoungGen: 3584K->3584K(7168K)] [ParOldGen: 21791K->21789K(22016K)] 25375K->25373K(29184K), [Metaspace: 2396K->2396K(1056768K)], 0.0825692 secs] [Times: user=0.31 sys=0.01, real=0.08 secs] java.lang.OutOfMemoryError: GC overhead limit exceeded 179 java.lang.OutOfMemoryError: GC overhead limit exceeded 2.632: [Full GC (Ergonomics) [PSYoungGen: 3584K->3584K(7168K)] [ParOldGen: 21792K->21791K(22016K)] 25376K->25375K(29184K), [Metaspace: 2421K->2421K(1056768K)], 0.0825939 secs] [Times: user=0.32 sys=0.00, real=0.08 secs] at java.util.LinkedHashMap.newNode(LinkedHashMap.java:256) at java.util.HashMap.putVal(HashMap.java:630) at java.util.HashMap.put(HashMap.java:611) 2.715: [Full GC (Ergonomics) [PSYoungGen: 3584K->3584K(7168K)] [ParOldGen: 21795K->21791K(22016K)] 25379K->25375K(29184K), [Metaspace: 2421K->2421K(1056768K)], 0.0437852 secs] [Times: user=0.16 sys=0.00, real=0.05 secs] at SimpleGCTest.testSuite1(SimpleGCTest.java:31) at SimpleGCTest.main(SimpleGCTest.java:58) 2.759: [Full GC (Ergonomics) [PSYoungGen: 3584K->3584K(7168K)] [ParOldGen: 21794K->21790K(22016K)] 25378K->25374K(29184K), [Metaspace: 2421K->2421K(1056768K)], 0.0676290 secs] [Times: user=0.22 sys=0.00, real=0.07 secs] 2.827: [Full GC (Ergonomics) [PSYoungGen: 3584K->3584K(7168K)] [ParOldGen: 21794K->21792K(22016K)] 25378K->25376K(29184K), [Metaspace: 2421K->2421K(1056768K)], 0.0594377 secs] [Times: user=0.17 sys=0.00, real=0.06 secs] java.lang.OutOfMemoryError: GC overhead limit exceeded 205 java.lang.OutOfMemoryError: GC overhead limit exceeded 2.887: [Full GC (Ergonomics) [PSYoungGen: 3584K->3584K(7168K)] [ParOldGen: 21796K->21794K(22016K)] 25380K->25378K(29184K), [Metaspace: 2421K->2421K(1056768K)], 0.0527991 secs] [Times: user=0.15 sys=0.00, real=0.05 secs] at java.util.LinkedHashMap.newNode(LinkedHashMap.java:256) at java.util.HashMap.putVal(HashMap.java:630) at java.util.HashMap.put(HashMap.java:611) at SimpleGCTest.testSuite1(SimpleGCTest.java:31) 2.940: [Full GC (Ergonomics) [PSYoungGen: 3584K->3584K(7168K)] [ParOldGen: 21797K->21794K(22016K)] 25381K->25378K(29184K), [Metaspace: 2421K->2421K(1056768K)], 0.0552781 secs] [Times: user=0.16 sys=0.00, real=0.05 secs] at SimpleGCTest.main(SimpleGCTest.java:58) 2.996: [Full GC (Ergonomics) [PSYoungGen: 3584K->3584K(7168K)] [ParOldGen: 21796K->21793K(22016K)] 25380K->25377K(29184K), [Metaspace: 2421K->2421K(1056768K)], 0.0938614 secs] [Times: user=0.27 sys=0.00, real=0.10 secs] 3.090: [Full GC (Ergonomics) [PSYoungGen: 3584K->3584K(7168K)] [ParOldGen: 21795K->21794K(22016K)] 25379K->25378K(29184K), [Metaspace: 2421K->2421K(1056768K)], 0.0403892 secs] [Times: user=0.12 sys=0.00, real=0.04 secs] 3.130: [Full GC (Ergonomics) [PSYoungGen: 3584K->3584K(7168K)] [ParOldGen: 21796K->21796K(22016K)] 25380K->25380K(29184K), [Metaspace: 2421K->2421K(1056768K)], 0.0411821 secs] [Times: user=0.15 sys=0.00, real=0.04 secs] java.lang.OutOfMemoryError: GC overhead limit exceeded Exception in thread "main" java.lang.NullPointerException at SimpleGCTest.testSuite1(SimpleGCTest.java:38) 3.172: [Full GC (Ergonomics) [PSYoungGen: 3584K->0K(7168K)] [ParOldGen: 21799K->232K(6656K)] 25383K->232K(13824K), [Metaspace: 2421K->2421K(1056768K)], 0.0033566 secs] [Times: user=0.01 sys=0.00, real=0.00 secs] at SimpleGCTest.main(SimpleGCTest.java:58) Heap PSYoungGen total 7168K, used 74K [0x00000000ff580000, 0x0000000100000000, 0x0000000100000000) eden space 3584K, 2% used [0x00000000ff580000,0x00000000ff5928b8,0x00000000ff900000) from space 3584K, 0% used [0x00000000ffc80000,0x00000000ffc80000,0x0000000100000000) to space 3584K, 0% used [0x00000000ff900000,0x00000000ff900000,0x00000000ffc80000) ParOldGen total 6656K, used 232K [0x00000000fe000000, 0x00000000fe680000, 0x00000000ff580000) object space 6656K, 3% used [0x00000000fe000000,0x00000000fe03a200,0x00000000fe680000) Metaspace used 2427K, capacity 4486K, committed 4864K, reserved 1056768K class space used 263K, capacity 386K, committed 512K, reserved 1048576K