01-05-2013
If you are looking at a single CEC model of the P570 there is not a lot of difference between the P520, P550 or P570 from a "sand-box" for "playing around"
A P520 will have 1, 2 or 4 processors depending on Model,
A P550 will have a maximum of 8 or 16 depending on Model,
and a P570 will have, I suspect, a maximum of 4 processors per CEC - at least with Power5. (A P570 could have up to 4 CECS interconnected in a frame for 16 processors and much more RAM).
Personally, with a small budget - look at P520.. If you are looking for experience with more than 4 processors - P550 is probably most economical path.
Hope this helps.
p.s. Rack units don't have to be in a rack, but stacking can become more difficult when you have more than one - regardless of manufacturer.
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LEARN ABOUT DEBIAN
update-gap-workspace
UPDATE-GAP-WORKSPACE(1) User Commands UPDATE-GAP-WORKSPACE(1)
NAME
update-gap-workspace - manage a GAP workspace.
SYNOPSIS
update-gap-workspace
update-gap-workspace update
Create or update the GAP workspace.
update-gap-workspace delete
Delete the GAP workspace.
DESCRIPTION
At start up, GAP load all libraries and packages available on the system. This take several seconds. To save time, GAP can store the
result of this initialisation in a `workspace'. update-gap-workspace help to manage such workspaces. update-gap-workspace can be run as
root to manage the system-wide workspace. update-gap-workspace can be run as a normal user. In this case the workspace is stored in
$HOME/gap/workspace.gz.
Note that you need to rebuild the workspace each time GAP packages are added, removed or updated. To automate that task, if the system-wide
workspace exists, it is automatically updated whenever a GAP-related Debian package is installed or upgraded.
The gap script will automatically load such workspace at start up.
FILES
/var/lib/gap/workspace.gz:
The system-wide GAP workspace.
$HOME/gap/workspace.gz:
The user-specific GAP workspace.
SEE ALSO
gap(1), The `SaveWorkspace' function in the GAP manual.
AUTHOR
Bill Allombert <ballombe@debian.org>
NOTES
We are considering enabling the system-wide workspace per default, though this feature could be too confusing for old-time GAP users. If
you have opinions about it, please mail <gap@packages.debian.org>.
Debian July 2003 UPDATE-GAP-WORKSPACE(1)