I have a (sparc) Solaris 10 server with 16G of RAM. There are over 4G free.
Memory: 16G phys mem, 4371M free mem, 8193M swap, 8193M free swap
I am running a lot of java processes (I'm using the 32-bit JVM because none of them need a lot of memory) and want to run another one. But it claims to be out of memory.
# /usr/jdk/jdk1.6.0_17/bin/java -version Error occurred during initialization of VM Could not reserve enough space for object heap
I tried running with a reduced memory pool max size (-Xmx). Then I gradually increased the ceiling until it was very high indeed. How much should it be allocating without the -Xmx flag? According to this page, I wouldn't expect it to try to use more than 1G. And yet I can go to more than three times that without error.
# /usr/jdk/jdk1.6.0_17/bin/java -Xmx3900m -version java version "1.6.0_17" Java(TM) SE Runtime Environment (build 1.6.0_17-b04) Java HotSpot(TM) Server VM (build 14.3-b01, mixed mode)
If I raise it above that level, then I start to get other errors, but I would expect that since I am approaching the 4G limit of address space for a 32-bit process anyway.
What could possibly be happening here, and how can I diagnose it myself? Edit: most of the java processes are running as different users (no more than 10 per user). But note in the above that I am trying to launch the new process (merely 'java -version') as root.
# ulimit -a core file size (blocks, -c) unlimited data seg size (kbytes, -d) unlimited file size (blocks, -f) unlimited open files (-n) 256 pipe size (512 bytes, -p) 10 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 29995 virtual memory (kbytes, -v) unlimited