On Tue, Dec 22, 2009 at 6:28 PM, Dr. David Kirkby <[email protected]> wrote: > William Stein wrote: >> On Tue, Dec 22, 2009 at 5:08 PM, Dr. David Kirkby >> <[email protected]> wrote: >>> I've just set this Sage 4.2.1 server up. >>> >>> It's on my home computer, on a slow network, so performance wont be great. >>> The >>> machine is also 8 years old, so don't expect miracles from it! >> >> It seems to work well. Is it a 4-core box? >> >> Calling get_memory_usage() goes nuts with: >> >> sh: top: not found >> sh: top: not found >> sh: top: not found >> ... >> >> since I guess we never rewrote that command to not rely on top. > > No, it is not quad core. It is a Sun Blade 2000 with 2 x 1200 MHz UltraSPARC > III+ CPUs. > > This Blade 2000 was made in 2002 - probably before the days of CPUs with > multiple cores. But only one processor is available in this zone, so the zone > will not know how many there are. > > I assume there must be 4 calls to top. > > My quad core (8 thread) machine is the Sun Ultra 27, which runs Open Solaris > on > a 3.33 GHz Xeon. I'd like to get Sage running on that, as that machine will be > considerably faster than this, and has a bit more memory (12 GB vs the 8 in > the > Sun Blade 2000). > > I might postulate that the fact the Sage code does not know how much RAM is > being used, would make it quite easy to exhaust the 6 GB of RAM allocated to > the > zone. I assume the limit I applied starting the notebook will not actually do > anything.
There > Anyway, feel free to crash it if you want. As I say, it wont cause me any > problems, as it is in a zone. I'm trying a = matrix(ZZ, 10000) and I'm sure that the 500000MB limit isn't being enforced, since on sage.math that command uses about 4GB RAM: sage: get_memory_usage() 769.07421875 sage: a = matrix(ZZ, 10000) sage: get_memory_usage() 5346.5703125 This may be a bug in the notebook. William -- To post to this group, send an email to [email protected] To unsubscribe from this group, send an email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
