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RAM usage

Hi all,

I've made a debian live CD to allow me to perform some modelling. The
machines I have available to play with have 2 GB of RAM, which is
normally a lot more than enough to run my work. However, debian live's
tmpfs (I presume) seems to be taking up about >1 GB of that RAM, which
(1) surprises me that so much is needed, and (2) doesn't leave enough
RAM for my modelling.

Under the debian live boot, free reports:

             total       used       free     shared    buffers     cached
Mem:        906588     287164     619424          0      41908     173652
-/+ buffers/cache:      71604     834984
Swap:            0          0          0

and df -h reports:

Filesystem            Size  Used Avail Use% Mounted on
unionfs               736M  303M  434M  42% /
tmpfs                 443M     0  443M   0% /lib/init/rw
udev                   10M  104K  9.9M   2% /dev
tmpfs                 443M  4.0K  443M   1% /dev/shm
/dev/scd0             303M  303M     0 100% /live/image
tmpfs                 443M  9.6M  434M   3% /live/cow
tmpfs                 443M   32K  443M   1% /tmp

I'm not sure I understand this all correctly, but if I do, then I
don't have any requirement for that much avail space in / or /tmp. Is
there any way to reduce the boot's memory footprint, or free the
available space back to the system's memory, for use by programs?


AJC McMorland, PhD Student
Physiology, University of Auckland

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