Berkeley CSUA MOTD:Entry 23333
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2024/11/23 [General] UID:1000 Activity:popular
11/23   

2001/12/21-22 [Computer/SW/OS/Solaris] UID:23333 Activity:high
12/21   Is there a new rule of thumb for sizing swap on systems these days?
        I remember the 2xRAM+1 rule but that seems way overkill on modern
        vm's.
        \_ i think http://docs.sun.com has new guidelines for solaris.
        \_ BTW, what's the reason behind the 2xRAM+1 rule for SunOS 4?  I'd
           think an OS should be able to operate with a swap file as small as
           two physical pages -- it just runs out of memory when too much is
           requested.
           \_ Idle procs get swapped out to make space for working procs.  I
              leave the rest for you to figure out.
              \_ I don't get it.  What's so special about the number 2xRAM+1?
                 Should be the rule simply be "anything bigger than zero, and
                 and the bigger the better"?
                 \_ You want to optimize the swap space and minimize paging.
                    Too little swap, you're accessing the main disk memory too
                    much. Too much swap, you waste disk space and increase
                    swap access time. These standards are from a time when
                    RAM was limited and pricey and disks small and slow.
        \_ Make your swap as large as your RAM so you can get core dumps.
        \_ hi. why is it that none of the people who answered this question
           know what they're talking about? except for the people asking the
           questions.
2024/11/23 [General] UID:1000 Activity:popular
11/23   

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