We have a distributed farm consisting of some fraction of time from the
following cpu's: (managers/contacts)
MIT - 10 DEC Alphas, 500 MHz (David Rowntree/Jianguo Zhao)
UVA - 13 Linux/Intel 300 MHz (Cole Smith)
FSU - 8 Linux/Intel, more to come (Larry Dennis)
OU - 1 Linux/Intel, (+Linux/Alpha's, others) (Allena Opper)
ODU - 2 DEC Alphas, 500 MHz (Andi Klein/other)
3 Linux/Intel 300 MHz
Calculate 3 types of events:
1) elastic scattering (10% of available farm)
2) CELEG with resonances+elastics (60% of available farm)
3) e-p-pi0 events from AO (30% of available farm)
1.6 GeV, 60% magnetic field
Plan to run for 3-4 weeks, re-evaluate as we go along. Runs begin as
soon
as possible, target is this week.
Analyze the runs with the 'Dec97' reconstruction program at JLAB which
is
now ready for 'cooking'.
File sizes: whatever you get from 24 hours of running, at first.
E.g., Linux/Intel @ 300 MHz, expect 0.8 sec/event & 4.1 kbyte/event.
=> ~ 440 Mbytes, ~108,000 events
For DEC Alphas, expect ~0.15 sec/event, => 2 Gbytes, ~500,000 events
After we gain some experience, the Linux runs could go longer, but the
Alpha
runs already hit the maximum file size. (We obviously need a multiple
file
output option from GSIM, as the DAQ has.)
The above numbers depend greatly on the FFREAD parameters.
FFREAD options to be used:
AUTO 0
CUTS 5.e-3 5.e-3 5.e-3 5.e-3 5.e-3
CCCUTS 1.e-3 1.e-3 1.e-3 1.e-3 1.e-3
DCCUTS 1.e-4 1.e-4 1.e-4 1.e-4 1.e-4
ECCUTS 5.e-4 5.e-4 5.e-4 5.e-4 5.e-4
SCCUTS 1.e-4 1.e-4 1.e-4 1.e-4 1.e-4
MAGSCALE 0.58275 0.75
NOGEOM 'ST'
NOSEC 'OTHE'
STOP
Typical startup script, with parameters:
../bin/Linux/gsim \
-ffread longrun1.ffread \
-bosout longrun1.evt \
-nomcdata \
-mcin 2.4gev_p_tgt_1.evt \
-trig 100 \
>& longrun1.out &
ISSUE: to run with secondaries turned off in volume OTHE or not? We're
trying to evaluate sample files. With OTHE turned on, we get more junk
(which looks like the real data), but it takes twice as long to run,
and the file size is twice as big. The current proposal is to leave it
turned off, but this is clearly worth discussing.
Any comments are welcome.