Summary PHYSGI01 Meeting 6/27/94
B. Gibbard
Next Meeting:
The next meeting will be Monday, July 11, 11:30 - 12:00, in the Rm 2-187.
** Notice July 4 is skipped and the next meeting is in a non-standard room. **
Production User Input for PHYSGI01:
- This week's meeting was again lightly attended by users presumably
indicating a lack of pressing concerns related to system resource sharing and
general system operations.
- During the past week the major large scale CPU intensive user was E818
(Hackenburg et al). Production CPU usage by other users has been moderate and
intermittent.
- Tape and disk activity on PHYSGI continued high.
- Indications are that similar relatively light CPU usage with heavy tape
and disk usage is likely for the coming week.
All experiments which anticipate running more than an single occasional
production job during a given week are required to 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 6/27/94:
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.
There are indication that the 8 mm tape drive in one of the stackers has a
serious problem and it is likely that it will have to be removed for repair,
resulting in a couple of brief periods of system down time this week.
- 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.
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.