Java HotSpot(TM) 64 位服务器 VM 警告

Question

I have a tomcat as my web-server, it stopped down automatically with the given Error -

Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00007f16a8405000, 12288, 0) failed; error='Cannot allocate memory' (errno=12)

i need to figured it out what actually happened ? and what warning does mean ?

Answer 1

There is insufficient memory for the Java Runtime Environment to continue.

Native memory allocation (malloc) failed to allocate xxxxx bytes for committing reserved memory.

Possible reasons:

1. The system is out of physical RAM or swap space
2. In 32 bit mode, the process size limit was hit

Possible solutions:

1. Reduce memory load on the system
2. Increase physical memory or swap space
3. Check if swap backing store is full
4. Use 64 bit Java on a 64 bit OS
5. Decrease Java heap size (-Xmx/-Xms)
6. Decrease number of Java threads
7. Decrease Java thread stack sizes (-Xss)
8. Set larger code cache with -XX:ReservedCodeCacheSize=

If you are on Java 8 or later, please also see this question: Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize

Answer 2

Java was not able to allocate enough memory, ie it's not Java's heap limit that's in the way but rather no more memory available to be given to Java by OS. Check that the machine is not running out of memory. And first clean ram or increase ram then check if again there is an out of memory error then increase heap size:

-Xms128m min(heap size)

-Xmx512m max(heap size)

-XX:MaxPermSize max(perm size)

Answer 3

There is insufficient memory for the Java Runtime Environment.

I was facing the same issue as shown below.

OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000f80f7000, 20729856, 0) failed; error='Cannot allocate memory' (errno=12)

I solved this by using below steps.

There are processes hanging on to files they've accessed on /tmp

Use lsof to check:

lsof | grep deleted

It will list processes, Now you can kill those process which will free the space for you.