can't start tomcat on centos with large memory

We are trying to run tomcat 5 with 30G memeory: -Xms30G -Xmx30G, running on centos 5 64bit with 64G memory and 24 CPUs.

we know that the jvm requires contiguous memory, before starting tomcat 'free -m' shows there are 40G available.

what ever we do we can't start the jvm with more then 26G, beyond that it complains on "Cannot allocate memory for initial java heap".

any idea will be helpfull.

 

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