[ns] Problems with trace-queue/big simulation/grep ?

[Andrea Josi <mr_josi@yahoo.it>]

Hi all,

i am getting weird trace files when i use
"trace-queue":

in my tcl script i have lines like

$ns trace-queue $n30 $n25 [open "| grep cbr > geo.tr"
w]
$ns trace-queue $n38 $n35 [open "| grep cbr > geo.tr"
w]
$ns trace-queue $n35 $n38 [open "| grep cbr > geo.tr"
w]

Most of the trace file's lines are "ok" while some of
them are incomplete, for example:

this line is "ok"

- 9.992547 59 58 cbr 210 -P----- 0 43.1 -2147483648.0
2130 214947

the following two clearly are not !

r 7483648.0 2130 214947

1 215041

What is the reason of this behaviour ? 
(memory overflow ???)

I could make up for this be "cleaning" the trace file
with an awk script, but i would lose some data then !

Thanks a lot.



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