Re: Solaris memory management

Martin Fuerderer wrote: > Dirk Moolman wrote on 11.04.2005 13:35:51: >>I am trying to find out what the limit is on contiguous memory in >>Solaris. Can I grab one segment of 20G, or will Solaris break the >>segment down into smaller pieces ? >> >>For example, if I run onstat -g seg, can I have one segment of 20G, or >>is this not possible ? >> >>I am using Solaris 9 and IDS 7.31 FD3 ...... 64bit > > in general this is configurable in the kernel. Maximum possible > configuration may also depend on Solaris version, but I don't know. > The kernel parameter may be something like > shminfo_shmseg > but I'm not 100% sure. There are various issues here. One is what the system is configured to permit - which can be found in /etc/system on Solaris (at least 8 and before; I assume 9 and above too). The other is what IDS is coded to permit. In IDS 10.00, we added the 'Shared memory segments bigger than 4GB' feature for 64-bit machines, so I assume that older versions (such as 7.31) only permit you to have shared memory segments up to 4GB and not bigger. You should be able to get to 20 GB, but it will require 5 segments of 4GB each, assuming your kernel is configured to permit such large segments. -- Jonathan Leffler #include <disclaimer.h> Email: jleffler@earthlink.net, jleffler@us.ibm.com Guardian of DBD::Informix v2005.01 -- http://dbi.perl.org/