Summary PHYSGI01 Meeting 7/11/94
B. Gibbard
Next Meeting:
The next meeting will be Monday, July 18, 11:30 - 12:00, in the Rm 2-160.
Production User Input for PHYSGI01:
- No users appeared at this week's meeting.
- During the past two weeks the major CPU intensive user was E818
(Hackenburg et al). Production CPU usage by other users has been small and
intermittent.
All experiments which anticipate running more than an single occasional
production job during a given week should attend the
scheduling meeting. If that is not possible they should notify Bruce
Gibbard (gibbard@bnl.gov) and Tom Throwe (throwe@rsgi02.rhic.gov)
of their needs by Email prior to the Monday 11:30 meeting.
Plan for week beginning 7/11/94:
The currently established rules will remain in effect for the
following week. These rules are intended to give a modest
advantage to experiments involved in the current AGS run.
- A production process is defined as a process which would accrue an hour or
more of CPU time in 8 hours of uncontended running.
- Each experiment is allowed to run up to 6 concurrent "production"
process, only one of which may be run at full priority, (100).
- Experiments not actively engaged in the current AGS run must nice all
additional "production" process to 4 (104).
- Experiments which are actively engaged in the current AGS run may nice one
additional "production" process to 2 (102) but are required to nice
"production" processes beyond the first two to 4 (104).
- Extended use of a tape drive is defined as use which extends for more
than 1 hour.
- In the presences of demand by other experiments for tape drives, no
experiment should make extended use of more than 2 tape drives.
- Experiments not actively engaged in the current run should limit their
extend use, in the presence of demand by other experiments, to 1 tape
drive.
Other issues:
There have been numerous reports of network problems associated with the
use of PHYSGI01 as well as other Physics Department machines resently. CCD
believes that Charybdis, the router serving Physics, is heavily overloaded.
Parts are on order to upgrade it and it is hoped that this near future upgrade
will substantially relieve these recently observed problems.
The interaction of private multi-cast tunnels with MBone tunnels has the
potential for substantially increasing network traffic. In the absence of
an important need for such tunnels, their use is discouraged on subnets in
the Physics Department.
Problems continue with one of the 8mm tape stackers. One cycle of
exchanging a defective stacker for a "working" one occur last week,
and the newly received one was found to also be defective. A second
cycle of exchange will be needed.
The challenge machine replacing PHYSGI01 has just arrived and will be
brought up by an SGI engineer soon, hopefully this week. We plan to make
it available as a simple compute server soon but will probably not try to
move the peripherals off of the current PHYSGI01 until the end of the
AGS run which is now expected to be less than 3 weeks away.
Users of PHYSGI01 are still strongly encourage to set a
mail forward
from their working account on PHYSGI01 to an account on a machine where
they frequently check their mail so that they can be easily contacted.