Difference between revisions of "Set randy factor"
(New page: https://logbooks.jlab.org/entry/3584611 Original entry We fixed this problem by increasing the event buffer size and changed the "randy_factor". The event buffer size was set to ac...) |
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proc setrf {val} | proc setrf {val} | ||
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{ | { | ||
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global env | global env | ||
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set rocname [info objects] | set rocname [info objects] | ||
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$rocname configure -randy_factor $val | $rocname configure -randy_factor $val | ||
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set myvar [$rocname cget -randy_factor] | set myvar [$rocname cget -randy_factor] | ||
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puts "setrf -> $myvar" | puts "setrf -> $myvar" | ||
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return $myvar | return $myvar | ||
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} | } | ||
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setrf 5 | setrf 5 | ||
Latest revision as of 15:40, 28 August 2018
We fixed this problem by increasing the event buffer size and changed the "randy_factor".
The event buffer size was set to accommodate the expected maximum size for a pedestal run:
nmods = 16
nchannels/mod = 16
nstrips/chan = 128
nsamples/strip = 6
nbytes/word = 4
size = 16 * 16 * 128 * 6 * 4 = 768kB
To be safe, we set this value to 800kB:
#define MAX_EVENT_LENGTH 1024*800 /* Size in Bytes */
The CODA ROC (by default) expects events that are 4MB / 64 = 64kB. 4MB is the total network buffer size, and 64 is the default "randy_factor".
The 4MB size cannot be changed.. so we change the randy_factor to allow for larger events:
randy_factor = 4MB / 800 kB = 5.12 -> 5
To set this value... we used a TCL script (setrf.tcl) loaded when the ROC is executed:
coda_roc_rc3 -type ROC -name ROCNAME -i -f setrf.tcl
Where setrf.tcl:
proc setrf {val}
{
global env
set rocname [info objects]
$rocname configure -randy_factor $val
set myvar [$rocname cget -randy_factor]
puts "setrf -> $myvar"
return $myvar
}
setrf 5
The routine first gets loaded by the ROC, then executed with the
setrf 5
to set the randy_factor to 5. The ROC is run in interactive mode here... so one could also change the factor on the fly with
setrf <value>
at the ROCs TCL shell.
