Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
is there limit to increase the max heap size in java? I am wondering if the large heap size can be set as long as the physical memory is available.
For example, if a server has 100G for RAM, then can i set the max heap at 90G? I know that GC will halt the app, but I am just curious.
Thanks.
With a 32 bit JVM, the hard limit would be 4 GB but the actual one would be lower as, at least if you aren’t running a 64 bit OS, some space must be left for non heap memory, like the JVM own address space (non java), stacks for all threads, architecture/OS limitations and the likes. A 64 bit JVM has no such limitation so you could set the limit to 90 GB although I wouldn’t recommend it for the reason you already pointed.