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Intimate Shared Memory (ISM)


 
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Operating Systems Solaris Intimate Shared Memory (ISM)
# 8  
Old 10-20-2009
I'm not sure how to interpret your mean about paging (I assume you really meant paging and not swapping.. they have different meanings in a Solaris system).

With DISM, deciding which pages in the SGA are pagable is managed by the Oracle. So things can get interesting if there is pressure on the page cache (physical memory) by things not handled by Oracle. It may make decisions that cause poor performance. So, yes, you will use the swap (if that's what you mean by VM from harddisk) areas more than you'd like.

You should really only use DISM if you have a real need to change the SGA on the fly. That's my opinion and I'm sticking to it... unless someone comes up with a better one Smilie
# 9  
Old 10-20-2009
Thanks for your explanation.

I conclude with DISM the swapping to VM (disk) is still function. I'm asking this question because my swap on container doesn't work out. With command vmstat -5 the po column is 0 even when the memory is full in use. I tot the DISM/ISM is the cause of this anomaly. I guess I have to find out another cause then..

Last edited by sprout009; 10-20-2009 at 10:24 AM..
# 10  
Old 10-20-2009
Quote:
Originally Posted by sprout009
I'm asking this question because my swap on container doesn't work out. With command vmstat -5 the swapped paged in/out is 0 even when the memory is full in use.
According to the documentation, these statistics are only reported at the zone level when a processor set is bound to that zone.
# 11  
Old 10-20-2009
Hi,

And so far there is no solution for this? So we need to upgrade physical RAM?

Could you pass the document to my email uk.maniac1@yahoo.co.uk. Thanks.
# 12  
Old 10-20-2009
A solution to what problem ?
vmstat not reporting paging activities with zone granularity ?

The documentation is on your host:
Code:
man vmstat

# 13  
Old 10-20-2009
What metric do you use to justify that your memory is "full"? If your memory was full from a Solaris point of view, you would first start paging then swapping and performance would go bad. You would also probably see a non zero b count in vmstat among other things..
# 14  
Old 10-20-2009
Data

To jlliagre:
I meant the solution why the swap doesn't work on Solaris zone.

To jp2542a: My application on zone "shouted out" the malloc failed due to out of memory, that's the obvious metric I used. I used vmstat to check resource stat and found that my zone doesn't use the allocated swap area on disk.

I guess my problem is clear that I'm running out of memory and the swap to disk doesn't work out. I tried to post and searching for a solution but I got back and forward explanation instead

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