Can't able to create more than 28 spawn bash in fedora core linux 64 bit

[prabuc]

Hi All,

I can't able to create more than 28 spawn bash in fedora core 7 (2.6.25.4 kernel) linux 64 bit machine. I can able to create 1015 spawn bash in 32 bit fedora 7 core.
Can someone help out from this...

Script I have used for both 32 bit and 64 bit:
-------------------------------------------------------
#!/usr/local/bin/expect -f

for { set i 0 } { 1 } { incr i} \
{
variable General
variable telnetPrompt

puts "i = $i"

if { $i == 20 } \
{
puts "Waiting for some time "
#sleep 20
}

puts " Test 1"

#spawn -noecho ./tools/bash-ln9
puts " Test 2"
spawn -noecho bash

expect \
{
-re "#" {
lappend General(pidList) $spawn_id
puts "Printing Spawn_id = $spawn_id"
}
timeout {
sleep 1000000
error "shell_spawn: could not spawn bash"
return -1
}
}
}
exit

-------------------------------------------------------
Thanx in advance for all your efforts.

-Prabu
Karthik