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IDS Forum

shared memory parameters

Posted By: DOUGLAS MERRILL
Date: Tuesday, 9 February 2010, at 3:54 p.m.

Having trouble with share memory parameters.
I am trying to locate each piece of the memory size number reported by "onstat -". So far I have been able to correlate changes in onconfig with changes in that onstat number. However, I haven't been able to get it all and can't seem to find out who knows this.

When oninit -v starts up the engine, I see the resident memory pool number reported there but cannot find the details in that number. It's killing me.

You might ask why I'm doing this. Well, we had an assertion failure that we can't account for and when we killed all memory segments (with IBM's help) and rebooted the RHEL 4 AS box, IDS 10.00 FC4 could not attach to the SHMVIRTSIZE memory cited in the onconfig file. IBM suggested we take that 20gb figure and reduce it. We did and IDS attached and we went with it. We still don't know why we can't start the engine with the same 20gb SHMVIRTSIZE we have had for years.

One thing leads to another. We swopped identically memory from our test box to see if we could isolate the problem. No change was noted. Now I'm trying to get very specific about the shared memory parameters on our test box so that I can define and hopefully understand what is going on with our production box.

Of course both boxes are the same except for memory (prod has more). In fact, test has 24gb of ram with 6gb being used for raid5. The prod box has 32gb of ram with 8gb being used for raid5. Strangely, I can push SHMVIRTSIZE to 21gb on test but can only push prod to about 18.5gb. So now I'm in the middle of it. Seems to me something is going on with hardware or the OS but what? Why does IDS initialize with more virtual shared memory than there is memory on the box? Why can't the prod instance initialize using the same onconfig paramaters that it has for years?

On the other hand, here's an easy question: Where can I find the size of the resident pool, other than in the output from oninit -v ?

Thanks to all!

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