virtual portion memory size
A user on IDS 9.40FC9 / Solaris 10 asked why an 8 GB virtual portion was created as two 4 GB shared memory segments and whether a single 8 GB segment was possible. Replies first pointed at the Solaris kernel limit on maximum segment size (shmsys:shminfo_shmmax in /etc/system). The thread then concluded differently: IDS itself capped individual shared memory segments at 4 GB even on 64-bit builds in the 9.x line, with larger segments only supported from version 10 onward, so no tuning would give a single 8 GB segment on 9.40.
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Hi, I have ids 9.40fc9 running on SOLARIS 10. I assign 8GB to VIRTUAL PORTION , but database split this into two 4GB portion. Is it possible to have only one 8 GB virtual portion? is there any extra configuration for solaris or informix ? thanks in advance
Solaris has a kernel parameter that defines the largest shared memory segment. Don't remember what that is though. Art On Thu, Jun 26, 2008 at 9:52 AM, PAULO RAFAEL PADILLA < rafaelpadilla@grupomayan.com> wrote: > Hi, > I have ids 9.40fc9 running on SOLARIS 10. > I assign 8GB to VIRTUAL PORTION , but database split this into two 4GB > portion. > > Is it possible to have only one 8 GB virtual portion? > > is there any extra configuration for solaris or informix ? > > thanks in advance > > > > ******************************************************************************* > Forum Note: Use "Reply" to post a response in the discussion forum. > > -- Art S. Kagel Oninit (www.oninit.com) IIUG Board of Directors (art@iiug.org) Disclaimer: Please keep in mind that my own opinions are my own opinions and do not reflect on my employer, Oninit, the IIUG, nor any other organization with which I am associated either explicitly or implicitly. Neither do those opinions reflect those of other individuals affiliated with any entity with which I am affiliated nor those of the entities themselves.
I believe that parameter can be tweaked in '/etc/system' and is called 'shmmax' >From /usr/include/sys/shm.h: /* * Shared Memory information structure */ struct shminfo { int shmmax, /* max shared memory segment size */ shmmin, /* min shared memory segment size */ shmmni, /* # of shared memory identifiers */ shmseg, /* (obsolete) */ shmall; /* (obsolete) */ };
The parameter is actually refered to in our /etc/system file as 'shminfo_shmmax' (solaris 5.8) MM
I think the parameter in /etc/system is set shmsys:shminfo_shmmax=4294967295 Thank you, Kannan -----Original Message----- From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Art Kagel Sent: Thursday, June 26, 2008 10:31 AM To: ids@iiug.org Subject: Re: virtual portion memory size [12507] Solaris has a kernel parameter that defines the largest shared memory segment. Don't remember what that is though. Art On Thu, Jun 26, 2008 at 9:52 AM, PAULO RAFAEL PADILLA < rafaelpadilla@grupomayan.com> wrote: > Hi, > I have ids 9.40fc9 running on SOLARIS 10. > I assign 8GB to VIRTUAL PORTION , but database split this into two 4GB > portion. > > Is it possible to have only one 8 GB virtual portion? > > is there any extra configuration for solaris or informix ? > > thanks in advance > > > > ************************************************************************ ******* > Forum Note: Use "Reply" to post a response in the discussion forum. > > -- Art S. Kagel Oninit (www.oninit.com) IIUG Board of Directors (art@iiug.org) Disclaimer: Please keep in mind that my own opinions are my own opinions and do not reflect on my employer, Oninit, the IIUG, nor any other organization with which I am associated either explicitly or implicitly. Neither do those opinions reflect those of other individuals affiliated with any entity with which I am affiliated nor those of the entities themselves. ************************************************************************ ******* Forum Note: Use "Reply" to post a response in the discussion forum. ***** Jackson Hewitt Email Disclaimer ***** The sender believes that this E-mail and any attachments were free of any virus, worm, Trojan horse, and/or malicious code when sent. This message and its attachments could have been infected during transmission. By reading the message and opening any attachments, the recipient accepts full responsibility for taking protective and remedial action about viruses and other defects. The sender's business entity is not liable for any loss or damage arising in any way from this message or its attachments. Privileged/Confidential Information may be contained in this message. If you are not the addressee indicated in this message (or responsible for delivery of the message to such person), you may not copy or deliver this message to anyone. In such case, you should destroy this message and kindly notify the sender by reply email.
> Hi, > I have ids 9.40fc9 running on SOLARIS 10. > I assign 8GB to VIRTUAL PORTION , but database split this into two 4GB portion. > Is it possible to have only one 8 GB virtual portion? > is there any extra configuration for solaris or informix ? > thanks in advance I don't remember exactly what version the change occurred in but, I seem to recall at some point, even on 64bit builds, there was a limit on the size of 1 segment of 4Gb. So even if the OS let you create shared memory segments > 4GBb, IDS was limiting the sizes to 4Gb.
>I don't remember exactly what version the change occurred in but, I seem to >recall at some point, even on 64bit builds, there was a limit on the size of 1 >segment of 4Gb. So even if the OS let you create shared memory segments > 4GBb, >IDS was limiting the sizes to 4Gb. I went and checked and that change was put into 10 and higher. So in the 9.x family, you are limited to a max size of 4Gb shared memory segments.