The 4GB virtual address limit for 32 bit OSes only applies to ***per process***. So if you have 12GB wit a 32 bit PAE kernel, because of the PAE you can address even 64GB all together theoretically. So you can have a JVM which consumes ~2GB, a Postgres which consumes ~2GB, a JBoss, etc, they can add up way more than 4GB. But. One process can only see 4GB virtual address space and unfortunately the OS reserves a big portion of that (usually 1 or 2GB, depending on the OS, that's where the OS exposes the kernel services for you, and some pert of hardware, you can see those in that reserved range). So in practice this means you can allocate 2-3GB per process, much rather 2GB.
Csaba On Mon, Sep 23, 2013 at 7:56 AM, Howard White <[email protected]> wrote: > On 09/23/2013 08:14 AM, Kent Perrier wrote: > >> If this is a 32-bit VM (which is what your say in the OP) are you using >> a PAE kernel? IIRC, you are not going to access more than 4 GB of RAM >> with a 32-bit OS without a PAE kernel. Is moving to 64-bit an option? >> >> > Yes, we deploy user systems on 32bit servers because of software licensing > issues. I am not yet able to drag the company into 64bit computing but I > am trying. > > CentOS 6 is a PAE kernel and will not install into an environment that > does not support PAE. That said, PAE is not a native environment that > addresses beyond 3.?GB (virtual virtual memory on a virtual guest; this has > to be broken at some level...) > > Howard > > > -- > -- > You received this message because you are subscribed to the Google Groups > "NLUG" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to nlug-talk+unsubscribe@** > googlegroups.com <nlug-talk%[email protected]> > For more options, visit this group at http://groups.google.com/** > group/nlug-talk?hl=en <http://groups.google.com/group/nlug-talk?hl=en> > > --- You received this message because you are subscribed to the Google > Groups "NLUG" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to > nlug-talk+unsubscribe@**googlegroups.com<nlug-talk%[email protected]> > . > For more options, visit > https://groups.google.com/**groups/opt_out<https://groups.google.com/groups/opt_out> > . > -- -- You received this message because you are subscribed to the Google Groups "NLUG" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nlug-talk?hl=en --- You received this message because you are subscribed to the Google Groups "NLUG" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
