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IDS Forum

RE: 2 shared memory segments [18848 [18849] [18862

Posted By: Brian Amstutz
Date: Wednesday, 3 February 2010, at 10:06 a.m.

In Response To: 2 shared memory segments (Brian Amstutz)

Thanks Bruce

Posting my onstat -g seg looked like it was going to be pretty messy with
line wrapping and all - I'm not exactly sure what I should be looking for
in regards to SHMBASE. The addr of my (R)esident segment is 80000000. Is
that what you were referring to?

I have moved some things around in the startup process - I have to replace
some hardware Friday so we'll see what happens went it reboots.

Brian

>-----Original Message-----

>From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of

>brucemarchu@aol.com

>Sent: Tuesday, February 02, 2010 10:40 PM

>To: ids@iiug.org

>Subject: Re: 2 shared memory segments [18848 [18849] [18862 [18875]

>

>Hi Brian,

>

>I have seen the SHMBASE parameter used with and without the "L". What=

>do you see when you run the "onstat -g seg" command?

>

>Since you also have the problem when rebooting the server you could
consid=

>er changing the order in which processes and applications are started on=

>the computer after a reboot to have the Informix engine start up before=

>a lot of other applications and processes. Take a look at the related st=

>art up scripts such at the iniit.d and rc scripts. See what is being
brou=

>ght up before the Informix.

>

>Regards,

>Bruce

>

>-----Original Message-----

>From: Brian Amstutz <brian.amstutz@asburyseminary.edu>

>To: ids@iiug.org

>Sent: Mon, Feb 1, 2010 1:06 pm

>Subject: RE: 2 shared memory segments [18848 [18849] [18862]

>

>Thanks Bruce and Andy.=20

>I have received this message both when only restarting Informix AND when=

>=20

>ebooting the entire server. I've used ipcs to try to find out what
else=20

>s using shared memory. I've identified a couple of apps and placed=20

>nformix ahead of those in the startup order. However, there are some=20

>pcs entries whose CPID or LPID do not show up in the current list of=20

>rocesses - not sure if this is "normal" under HPUX or not???=20

>'top' nearly always shows the 3 informix cpu vp's as the top 3 process -=

>=20

>t least all three within the top 8 processes.=20

>I checked the machine notes and the only kernel parameter that wasn't
set=

>=20

>igh enough was semmnu - I bumped it up from 256 to 2048 and will have to=

>=20

>find time to reboot the system. The recommendation for shmmax is=20

>nywhere from 4Gb up to the maximum allowed. Currently, ours is set to=20

>round 286Gb and the max allowed is 4096Gb. I may not understand
exactly=20

>ow shmmax is used but with only a 22Gb database, 8Gb RAM and 300Gb total=

>=20

>isk space - it seems like 286Gb for the max shared memory size should be=

>=20

>lenty large; however, I have bumped this up to approx 500Gb=20

>Recommended SHMBASE is 0x0L - ours is set to 0x0 (minus the L) which I=20

>THINK* is the same thing???=20

>Nothing of interest found in the syslogs=20

>Brian=20

>>-----Original Message-----=20

>From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of=20

>brucemarchu@aol.com=20

>Sent: Friday, January 29, 2010 8:36 PM=20

>To: ids@iiug.org=20

>Subject: Re: 2 shared memory segments [18848 [18849]=20

>=20

>Hi Brian,=20

>=20

>Here are several things to consider in addition to onconfig
parameters:=20

>1. There might be a problem with not enough available memory due to=20

>emor=3D=20

>y useage by applications that are running on the server. When you say=20

>re=3D=20

>start the server" do you mean just restarting the Informix engine, or=20

>re=3D=20

>you rebooting the actual physical machine? If your UNIX machine has acce=

>=3D=20

>ss to the "top" command you can run top with various flags to see what=20

>ro=3D=20

>cesses are using the most cpu's and the related memory being used.=20

>2. Is the Informix engine crashing or are you doing an orderly
shutdown=3D=

>=20

>and then a restart? If the Informix engine is hanging or crashing,
then=3D=

>=20

>are you checking to make sure that all of the Informix memory segments=20

>a=3D=20

>ve been cleaned out before a restart. You can use ipcs and various flags=

>=3D=20

>such as ipcs -a, and ipcs -m from the UNIX prompt.=20

>3. Check the Informix machine and documentation notes to see settings=20

>or=3D=20

>various UNIX kernel parameters relating to memory, and recheck your=20

>urre=3D=20

>nt settings. Make sure that you have at least the minimum values shown=20

>o=3D=20

>r memory related settings. Note that changing certain kernel
parameters=20

>i=3D=20

>ght require a reboot of the physical machine. =3D20=20

>4. Recheck the setting for the starting memory location SHMBASE in the=20

>nc=3D=20

>onfig file.=20

>5. Recheck the UNIX system logs [ maybe at /var/adm/syslog or a
similar=3D=

>=20

>location] to see if there are any error message regarding memory.=20

>=20

>Regards,=20

>Bruce=20

>=20

>-----Original Message-----=20

>From: Brian Amstutz <brian.amstutz@asburyseminary.edu>=20

>To: ids@iiug.org=20

>Sent: Fri, Jan 29, 2010 12:31 pm=20

>Subject: 2 shared memory segments [18848]=20

>=20

>Informix 10.00.HC5 HP-UX 11i v2=3D20=20

>Recently, I've started getting message like the following when I restart=

>=3D=20

>=3D20=20

>he server=3D20=20

>Could not create single shared memory segment with resident and=3D20=20

>on-resident partitions. Proceeding to create 2 shared memory
segments=3D20=

>=20

>nstead.=3D20=20

>Sometimes, the server startup continues OK but other times the
above=3D20=

>=20

>essage is followed by the following or similar message:=3D20=20

>shmget: [ENOMEM][12]: key 52574802: out of shared memory, check system=20

>ax=3D=20

>=3D20=20

>hared memory segment size=3D20=20

>t_shm_init: can't create virtual segment=3D20=20

>I'm guessing it's maybe a kernel parameter (shmmax?) issue but I haven't=

>=3D=20

>=3D20=20

>it on the correct one to increase or how much to increase it by.=3D20=20

>shmmax =3D3D 307200000000=3D20=20

>HMVIRTSIZE =3D3D 321536=3D20=20

>uffers =3D3D 350000 (2k)=3D20=20

>Any ideas what to tune and what to tune it to?=3D20=20

>Thanks!=3D20=20

>Brian=3D20=20

>=20

>*************************************************************************
=

>=20

>=3D=20

>****=3D20=20

>Forum Note: Use "Reply" to post a response in the discussion forum.=3D20=

>=20

>=20

>=20

>*************************************************************************
=

>=20

>*****=20

>Forum Note: Use "Reply" to post a response in the discussion forum.=20

>

>*************************************************************************
*=

>****=20

>Forum Note: Use "Reply" to post a response in the discussion forum.=20

>

>

>*************************************************************************
******

> Forum Note: Use "Reply" to post a response in the discussion forum.

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