Originally posted by: soumyapaul

Hi,
I've a P-series 55A server running AIX 5.3 - ML 4 & Oracle 10g. Evertime I find total real memory usage is almost 100%.

# svmon -G
size inuse free pin virtual
memory 2031616 2028553 3063 376799 951042
pg space 3145728 118758

work pers clnt
pin 376799 0 0
in use 851858 0 1176695

PageSize PoolSize inuse pgsp pin virtual
s 4 KB - 1987241 99142 344271 889522
m 64 KB - 2582 1226 2033 3845
But when I'm trying to get per process memory usage, using "ps vg" command, it gives different scenario,i cannot conclude,why 100% of RAM is full. Can any body help me to find out where the 8 GB of RAM being utilised .

Soumya
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Originally posted by: tony.evans

Filesystem cache.

It's pretty much common knowledge that AIX efficiently uses all of it's memory, it would be pointless to have a lot of memory unused and to direct all disk access to actual disks.

The tuning you need to get right is to make sure application memory isn't being paged out in preference to filesystem cache when it doesn't make sense. There's some great red books and training courses on AIX performance management.
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Originally posted by: apple08

dear mr tony,
how can we ensure the application memory isn't being paged out in preference to filesystem cache when it doesn't make sense. hope to hear from you. thank you
#AIX-Forum

Originally posted by: tony.evans

"There's some great red books and training courses on AIX performance management."

I'm no expert on performance management, but there's plenty of good written material and some excellent training courses.

Message was edited by: tony.evans
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