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| Subject: |
[account-managers] more on usage units on the 2009 ERCAP request form |
| Author: |
Francesca Verdier <fverdier_at_lbl.gov> |
| Date: |
2008-09-23 11:53:13 |
| An addendum:
The usage you see on the ERCAP 2009 request form is your current POWER3
based usage divided by 6. It is an approximation of your usage in
XT4-based units.
The current machine charge factors are:
Franklin - 6.5
Bassi - 6.0
Jacquard - 3.6
DaVinci - 4.0
We chose to divide your POWER-3 based MPP usage by 6 rather than 6.5 for
two reasons:
(1) to account for different usage patterns between the 4 machines
(2) At the time ERCAP opened we had not yet calculated the Franklin quad
core machine charge factor (performance results show that dual and quad
core have equivalent performance over a wide range of applications, so
the charge factor for both dual and quad core is 6.5.)
Sincerely, Francesca
Dear PIs and PI Proxies,
In 2009 MPP charging will be based on the Cray XT4 hour, rather than the
IBM POWER3 hour used in 2008. On the request form you will see your
current MPP usage displayed in Cray XT4 hours, and you should request
time for 2009 using these units as well. The MPP machines available for
2009 are:
the Cray XT4, Franklin, which will have a machine charge factor of 1
(the base unit)
the IBM POWER5, Bassi, which will have a machine charge factor of 1.
the Linux Cluster, Jacquard, which will have a machine charge factor of 0.6.
the SGI Altix, DaVinci, which will have a machine charge factor of 0.6.
Please note: the new XT4 units are only displayed in the 2009 ERCAP
area; the rest of NIM is still using the old POWER3 units.
--
Francesca Verdier email: fverdier@lbl.gov
Department Head, NERSC Services phone: 510-486-7193
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