Re: Q: SHMTOTAL

On Tue, 28 Sep 2004 02:58:13 -0400, Davorin Kremenjas wrote: 32bit processes on Solaris can only access/attach about 3.6 GB of shared memory segments with no segment larger than 2 GB (or the OS configured maximum segment size which may be smaller). I have a test prog if you want to play. To use more than than you need to get a 64bit release. Art S. Kagel > IDS 9.40 UC3 (32-bit) on Solaris 9 (64-bit) on Sun Fire V480 with 4 > processors and 12 GB of RAM. > > Hello everyone. > > I'm testing a new Informix configuration just to see if I can use as much of > a system resources as I have. > But, there seems to be a problem with the total amount of memory 32-bit > Informix can use. For example, the following parameters work fine: > SHMVIRTSIZE 2097152 # 2 GB SHMADD 1048576 # > 1 GB SHMTOTAL 3670016 # 3.5 GB> > But, after changing SHMOTOTAL to 5 GB (SHMTOTAL 5242880) instance cannot > initialize shared memory and I get the following message in Informix log: > "Value of SHMTOTAL exceeds operating system limits". > > Previously I set kernel parameter shmmax to 3 GB so Informix can acquire big > memory segments. > > At the moment I'm not sure if this is really OS limit or 32-bit Informix > limit. If I set SHMTOTAL to zero will Informix really be able to use more > than 4 GB of memory? Or should I migrate to 64-bit Informix? > > Thanks everyone.