On Apr 19, 2013, at 10:37 PM, Andrew Evdokimov <[email protected]> wrote:
> Hi Richard, > > On 20.04.2013 2:39, Richard Elling wrote: >> >>> you need a 32G swap device on any drive you like just to satisfy swap >>> allocation requirements coming from applications. >> >> Not likely. Measure it before using generalizations. >> ... >> So this box needs 187 MB of swap to back the anonymous pages. > > right, this box needs 187 MB of swap _today_. It may happen that you'll need > 188 (or 186 or 2186 or 3187) MB tomorrow because of natural changes in > workload, so why to spend time measuring and configuring and checking and > re-checking your swap requirements on a regular basis while 32GB of swap > costs only $1.6 with 3TB SATA HDDs? I really think there are many much more > fascinating and economically sound areas in OS performance tuning than > precise swap sizing. Just let it be equal to your RAM size and forget about > it forever. Big machines today have 32TB of RAM, much more than $1.6 worth of slow HDD. The important takeaway is that the old rules to thumb (eg 2x RAM) do not apply today and are not needed if you properly measure and design your system. -- richard ------------------------------------------- illumos-discuss Archives: https://www.listbox.com/member/archive/182180/=now RSS Feed: https://www.listbox.com/member/archive/rss/182180/21175430-2e6923be Modify Your Subscription: https://www.listbox.com/member/?member_id=21175430&id_secret=21175430-6a77cda4 Powered by Listbox: http://www.listbox.com
