We can run the 32-bit applications on the 64-bit OS. Although I get the 
feeling most sites are using a 32-bit OS also.

It is almost certain that 2GB is not enough for the 64-bit application. 
The memory usage is doubled and the 30% gain in CPU is therefore lost 
(a few times) in memory cost. There is an effort kicking off to attempt to 
reduce the memory usage and try to understand why 64-bit applications is 
double (you expect some things to double, but not everything I think). Not 
clear to me when the results from that will be available, certainly not 
soon.

On Wed, 11 Apr 2007, Wei Yang wrote:

> [JohnB, Richard, Len, Wei, Randy, Booker]
>
> 1. DQ2
>    corrupted AOD data removed. This gave us a few days of trouble free 
> production until today.
>
> 2. Tier 2 hardware
>
> Storage arrived waiting for memfs machines to free power. Current plan is to 
> reinstall memfs machines and then move them to Building 84. So Atlas storage 
> schedule depend on the schedule of memfs machines:
>
> a) 10Gb, 1Gb network cables ready from Build 50 to 84
> b) JohnY reconnected console lines to all memfs machines
> c) Charlie is working on subnet and dhcp for the memfs machines. To be done 
> today.
> d) Lance is working on kickstart configuration for memfs machines. To be done 
> today.
> e) Shirley will install OS, probably tomorrow.
>
> Randy or Wei will start a installation request in RT.
>
> Once Atlas storage is powered on, Lance will install solaris 10 x86 and ZFS 
> on them. Wei will work on xrootd part.
>
> CPU nodes are also arriving/will arrive soon. Need to decide OS (see below)
>
> 3. Xrootd/srm
>
> No info.
>
> AOB
>
> Tier 2 web site: we will go with our own tech base and design. Wei e-mailed 
> Chip of TIS to go ahead with the plan.
>
> At today's F&O phone meeting, Wei asked what OS will ATLAS use. So far, ATLAS 
> uses SLC3/4 32bit. Working on 64 bit (Boston is using SLC3 32 bit). There are 
> memory issues running (32bit or 64bit app) on 64 bit OS. Need clarification 
> about whether 2GB/core is enough for 64bit OS (with memory problem).
>
> We can run SLC/RHEL 4 32bit. But the OS will be slow, and yet we have to 
> support another OS.
>
>
>
> Wei Yang  |  [log in to unmask]  |  650-926-3338(O)
>
> 070321 Gordon   Discuss perception of SLAC Tier-2 with external folk.
>           070404 no info
>           070411 no info
>
> 070321 Wei      Send example new web page link to list
>           070404  done, no feedback
>           070411  Talked to T1/T2s. Will go with our own. E-mailed Chip
>                   of TIS
>
> 061108 Richard  Discuss with SLAC Security longterm approach to ATLAS VO
>          061115 No information.
>          061213 Nothing happened yet.
>          070103 No information.
>          070110 Richard & BobC in Denver, Stephen will email them.
>          070124 Don't know the status.
>          070131 Don't believe this happened.
>          070207 Have not done this. Randy has talked to Heather, didn't
>               have any time to comment today but she is aware about
>               it. Will treat each VO as an enclave, if you are using
>               anonymous accounts need to be able to show how ran a job
>               and when. The main issue is that VOs are not legal
>               entities and anyone can declare themselves a VO. Would
>               need to actually test that the required information can
>               actually be found.
>          070221 No info.
>          070228 No info.
>          070314 No info.
>          070321 No info.
>          070404 No info
>          070411 no info
>

--
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|Stephen J. Gowdy, SLAC               | CERN     Office: 32-2-A22|
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