RE: Shared Memory challenge on AIX 5.1

This is operating as 64-bit. I had heard about the limit on shared memory segments and was surprised that I had as many as I did, but if that is a 32/64 bit difference at least that one is explained. Thnks Malcolm -----Original Message----- From: Barry Leb [mailto:bjleb@hotmail.com] Sent: 23 January 2006 14:41 To: Malcolm Weallans; informix-list@iiug.org Subject: RE: Shared Memory challenge on AIX 5.1 Is this operating as 32 or 64 bit? If 32 bit you will run out of shared memory segments on AIX. I recall it to be 11 segments, tho there is some tinkering you can do with the environment variable EXTSHM to increase the number of segments grabbed by SHMADD. >From: "mweallans@panacea.co.uk" <mweallans@panacea.co.uk> >To: informix-list@iiug.org >Subject: Shared Memory challenge on AIX 5.1 >Date: 23 Jan 2006 04:04:10 -0800 > >One of my sites has 1 Gbyte of RAM. I have configured them to use >512Mbytes of Virtual Shared Memory and about 256 Mbytes of Resident >Share Memory. RESIDENT is set to 0. >During normal processing everything is OK with those settings. >Occasionally the size of the virtual shared memory rises from 512 >Mbytes to about 700 Mbytes and there is no effect felt by the users. >Last week the Virtual Shared Memory grew from 512 Mbytes to over 1.2 >Gbytes in about 90 minutes, but once again there was no discernible >effect on the users. Checking with ipcs and onstat -g seg shows that >we have 12 virtual shared memory segments. > >The ONCONFIG parameters are:- >SHMVIRTSIZE 524288 >SHMADD 65536 >SHMTOTAL 0> >Should I be concerned at using more shared memory than real memory? > >regards > >Malcolm > >_______________________________________________ >Informix-list mailing list >Informix-list@iiug.org >http://www.iiug.org/mailman/listinfo/informix-list - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - PANACEA GROUP OF COMPANIES Tel: +44 (0) 1256 30 50 50 Visit us at: http://www.panacea.co.uk National Support Centre: Tel: +44 (0) 1256 30 5000 Get support at: http://www.support.panacea.co.uk - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - IMPORTANT NOTICE This e-mail is intended only for the addressee named above and the contents should not be disclosed to any other person or copies taken. If you have received this e-mail in error, please notify us and delete the e-mail and all attachments immediately. Any views or opinions presented are solely those of the sender and do not necessarily represent those of Panacea Ltd. As Internet communications are not secure we do not accept legal responsibility for the contents of this message or responsibility for any change made to this message after it was sent by the original sender. We have an anti-virus system installed on all our PCs and therefore any files leaving us via e-mail will have been checked for known viruses. However we advise you to carry out your own virus check before opening any attachments, as we cannot accept liability for any damage sustained as a result of any software viruses. Panacea Ltd reserves the right to monitor e-mails in accordance with the Telecommunications (Lawful Business Practice) (Interception of Communications) Regulations 2000.