Maximum shared memory for Informix 7.3 on SCO 3.2v5.0.5

Hi !!! Yesterday I configured an instance of IDS 9.3 on RedHat and changed the shared libraries base address, so now I'm using over 2GB of shared memory for Informix with one million buffers echo 0xB0000000L > /proc/$$/mapped_base su -l informix -c oninit -v I also have an old SCO 3.2v5.0.5 with IDS 7.3, and I would really like to use more memory for that instance, because I've been unable to use more than 300000 buffers. Is there a way to change the shared libraries base address on SCO 3.2? Maybe another trick to use more memory? Thanks in advance for your help !!! Manuel Daponte

MADS wrote: > Hi !!! > > Yesterday I configured an instance of IDS 9.3 on RedHat and changed the > shared libraries base address, so now I'm using over 2GB of shared > memory for Informix with one million buffers > > echo 0xB0000000L > /proc/$$/mapped_base > su -l informix -c oninit -v IDS 9.3 on Linux is 32 bit (there isn't a 64 bit version) and so the most RAM you can possibly address is 4Gb or you run out of bits. If you've got over 2Gb shared memory and 1,000,000 buffers on a 2k page size you're over 4Gb which isn't possible without swapping. Your OS and other programs need to fit in somewhere as well. Am I reading your post correctly? > I also have an old SCO 3.2v5.0.5 with IDS 7.3, and I would really like > to use more memory for that instance, because I've been unable to use > more than 300000 buffers. Is there a way to change the shared libraries > base address on SCO 3.2? Maybe another trick to use more memory? In SCO 5.0.5 you can change the kernel parameters by running scoadmin, selecting Hardware/Kernel Manager and then Tune Parameters. You then have to relink the kernel and reboot. However I don't recommend this or guarantee that a similar trick would work as on Linux where the change of mapped_base is in the machine notes from Informix. Is there anything in the machine notes for SCO? I would only follow what's in there. Ben.

Well, actually the one million buffers are part of the 2.2 GB of RAM (onstat -g seg shows me that) Anyway, the IDS version for SCO is 7.31.UC5, and the release notes don't show anything about that ================================= MACHINE SPECIFIC NOTES FOR Informix Dynamic Server 7.31.UC5 PRODUCT RELEASE DATE: 23 Nov 1999 ================================= INFORMIX-OnLine Shared Memory Parameters (in Bytes): =================================================== SHMMAX: 409600000 SHMMIN: 1 SHMALL: 512 SHMMNI: 100 SHMSEG: 6 LOCATION OF SHARED MEMORY: ========================= SHMBASE 0x82000000L Kernel Parameters recommended for Informix ONLINE: ================================================== MAXUMEM:524287 SEMMNI: 8192 SEMMNS: 8192 SEMMAP: 8192 SEMMNU: 100 SEMMSL: 25 Kernel Parameters that might have to be changed depending on the Online configuration: ====================================== MAXUP SEMMNI SEMMNS SEMMSL NFILE Ben Thompson wrote: > MADS wrote: > > Hi !!! > > > > Yesterday I configured an instance of IDS 9.3 on RedHat and changed the > > shared libraries base address, so now I'm using over 2GB of shared > > memory for Informix with one million buffers > > > > echo 0xB0000000L > /proc/$$/mapped_base > > su -l informix -c oninit -v > > IDS 9.3 on Linux is 32 bit (there isn't a 64 bit version) and so the > most RAM you can possibly address is 4Gb or you run out of bits. If > you've got over 2Gb shared memory and 1,000,000 buffers on a 2k page > size you're over 4Gb which isn't possible without swapping. Your OS and > other programs need to fit in somewhere as well. Am I reading your post > correctly? > > > I also have an old SCO 3.2v5.0.5 with IDS 7.3, and I would really like > > to use more memory for that instance, because I've been unable to use > > more than 300000 buffers. Is there a way to change the shared libraries > > base address on SCO 3.2? Maybe another trick to use more memory? > > In SCO 5.0.5 you can change the kernel parameters by running scoadmin, > selecting Hardware/Kernel Manager and then Tune Parameters. You then > have to relink the kernel and reboot. However I don't recommend this or > guarantee that a similar trick would work as on Linux where the change > of mapped_base is in the machine notes from Informix. Is there anything > in the machine notes for SCO? I would only follow what's in there. > > Ben.

MADS wrote: > Well, actually the one million buffers are part of the 2.2 GB of RAM > (onstat -g seg shows me that) OK, that explains it - double counting. Thanks. > Anyway, the IDS version for SCO is 7.31.UC5, and the release notes > don't show anything about that > > ================================= > MACHINE SPECIFIC NOTES > FOR > Informix Dynamic Server 7.31.UC5 PRODUCT RELEASE > DATE: 23 Nov 1999 > ================================= > > INFORMIX-OnLine Shared Memory Parameters (in Bytes): > =================================================== > > SHMMAX: 409600000 > SHMMIN: 1 > SHMALL: 512 > SHMMNI: 100 > SHMSEG: 6 > > LOCATION OF SHARED MEMORY: > ========================= > SHMBASE 0x82000000L> > Kernel Parameters recommended for Informix ONLINE: > ================================================== > > MAXUMEM:524287 > SEMMNI: 8192 > SEMMNS: 8192 > SEMMAP: 8192 > SEMMNU: 100 > SEMMSL: 25 > > Kernel Parameters that might have to be changed > depending on the Online configuration: > ====================================== > > MAXUP > SEMMNI > SEMMNS > SEMMSL > NFILE I think all I can recommend is setting the kernel parameters as per the release notes if you haven't done so already. I don't think any of the adjustable ones are going to change your base memory address and allow more memory to be used and you can't dynamically change the parameters as with Linux. I suppose you have tried incrementing the BUFFERS parameter until the engine fails to start? I think the way forward is to migrate to Linux. Sorry if this is of limited help. Ben.