On Sat, Feb 11, 2012 at 6:53 PM, Todd Hodgen <[email protected]> wrote:
> There was a note from one of the Dev’s in the last 60 days or so that said
> that 4.6 was actually looking to require less memory, so this should help to
> improve things even more.

True. I don't have the results of side-by-side comparisons, 4.6
requires less because of several factors:

- you can disable services you don't want (best for small sites)
- supervisor rearchitected (~100MB -> 10K)  (best for small sites)
- we don't store all user data memory (best for large sites)
- we don't keep several copies of data in memory (best for large sites)

Memory analysis can be tricky. I was doing some tests trying to
squeeze 1000 user system in 2GB and it mostly worked but was slow
because java had to constantly request/release memory.

I assert, and I could be proven wrong, that if you want best
performance with least amount of memory is that you turn *off* swap,
and only enable it if you are running into legitimate memory issues
(some java errors PermGen don't count, that's different).  This of
course means you have to monitor your system. Using swap means you can
ignore your system longer but in some cases it's struggling to work
under load and causing inconsistent results.
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