JVM Heap Settings

[srinivma]

Thanks.. I will try that out and let you know. One last thing, is it also possible to increase dsize for 64 bit because I am facing the same issue mentioned earlier in the post for 32 bit JVM i.e. that is I am facing similar issue if the JVM Heap size is more than 13 GB.

[Don Morris_1]

maxdsiz_64bit is the corresponding tunable to set the hard limit for the 64-bit process heaps.

[srinivma]

What is the maximum size supported by maxdsize_64 bit?

[Aneesh Mohan]

Hi,

maxdsiz and maxdsiz_64bit
maxdsiz and maxdsiz_64bit specify the maximum data segment size, in bytes, for an executing process.

Acceptable Values:
maxdsiz for 32-bit processors:

Minimum
0x400000 (4 Mbytes)
Maximum
0x7B03A000 (approx 2 Gbytes)
Default
0x4000000 (64 Mbytes)
maxdsiz_64bit for 64-bit processors:

Minimum
0x400000 (4 Mbytes)
Maximum
4396972769279
Default
0x4000000 (64 Mbytes)


But if you set these values too high then system can face huge paging ,becoz any memory eating process can allocate as much virtual memory as it could.


Regards,
Aneesh

[Dennis Handly]

>What is the maximum size supported by maxdsize_64 bit?

More than the swapspace you have. It is a 64 bit value.
You could start with 13 GB.