Richard, Thanks for the beer analogy :-) But I think you misunderstood my question. I'll also use the beer analogy: 1. I have certain bottle of beers in my fridge (total memory) 2. Some guests are drinking beers ( current apps consuming memory ) 3. A bunch of new friends just called they are coming to the party and requested N bottles of beers. (new app requirement) 4. Once upon a time I had a record that could tell me how much beer there are in the fridge. (vmstat freemem w/o ZFS) 5. However a new guest just came and claimed all the beer in the fridge is his even though he would be nice enough to give his beer to others if so they request. (ZFS ARC) 6. But now I lost track how much beer there are in the fridge and if I need to start serving vodka instead/go buy some more. (Roughly just how much memory do I have to give out to apps without inducing paging/memory upgrade?)
My question right now is NOT how much memory I need - Let's say I do know I need X GB ISM for my Oracle DB or Y GB for my JavaVM, my question is "Do I have enough RAM on my system do accomodate that without causing paging?" Once upon a time I could answer the question with some confidence. I can't answer it anymore. -- This message posted from opensolaris.org _______________________________________________ perf-discuss mailing list perf-discuss@opensolaris.org
