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cat << EOF > Test.java
public class Test {
public static void main (String[] args) {
System.out.println("Memory:" + Runtime.getRuntime().maxMemory()/1024/1024);
System.out.println("CPUs: " + Runtime.getRuntime().availableProcessors());
}
}
EOF
Docker Tests
# Java 8u121 ignoring the memory constraint
docker run -m 100MB openjdk:8u121 java -XshowSettings:vm -version
# Java 8u131 calculating based on memory constraint
docker run -m 100MB openjdk:8u131 java -XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap -XshowSettings:vm -version
java -XshowSettings:vm -XX:+UnlockDiagnosticVMOptions -XX:+PrintActiveCpus -version
java -XX:+PrintFlagsFinal -XX:+PrintGCDetails -version | grep 'MaxHeapSize'
docker run -it -m 500MB --cpus="1.25" openjdk:8u131
cat /sys/fs/cgroup/cpu/cpu.cfs_quota_us
cat /sys/fs/cgroup/cpu/cpu.cfs_period_us
java -XX:+UnlockDiagnosticVMOptions -XX:+PrintActiveCpus -version
cd test
java Test
now try with the experimental settings
java -XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap Test
--------------------------------
Kubernetes is using the --cpu-quota and --cpu-period settings
you can try
docker run -it -m 500MB --cpu-quota=50000 --cpu-period=100000 openjdk:8u131
Otherwise just follow steps 1 through 9 and if you wish to kill the JVM running Spring Boot
curl 192.168.99.101:31915/api/memory
the ip and port is derived via ./9_curl_service_bootboom.sh
as that will overallocate heap and depending on the VM RAM size and the bootboom-deployment.yaml, it dies
My minishift VM size is 8GB
./10_describe_bootboom.sh | grep OOMKilledAbout
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