[Zope] "./start -t 2" does not start 2 but 4 threads

[Jens Nachtigall]

Hi all,

I use Zope-2.6.2-linux2-x86 on RedHat-Linux7.2. When I want to start Zope with
 only 2 threads (I want to reduce the memory usage), 4 threads are started:


$ pstree -a -c freifunk
python) /home/www.freifunk.net/Zope-2.6.2-linux2-x86/z2.py -t 2
  `-python) /home/www.freifunk.net/Zope-2.6.2-linux2-x86/z2.py -t 2
      `-python) /home/www.freifunk.net/Zope-2.6.2-linux2-x86/z2.py -t 2
          |-python) /home/www.freifunk.net/Zope-2.6.2-linux2-x86/z2.py -t 2
          `-python) /home/www.freifunk.net/Zope-2.6.2-linux2-x86/z2.py -t 2

(Yes, that are 5 not 4 processes, but only the last 4 consume a lot
of memory [about 64MB]):
  PID USER     PRI  NI  SIZE  RSS SHARE STAT %CPU %MEM   TIME COMMAND
16284 freifunk   9   0 66124  64M  2216 S     0.0  7.3   3:07 python
16290 freifunk   9   0 66124  64M  2216 S     0.0  7.3   0:00 python
16291 freifunk   9   0 66124  64M  2216 S     0.0  7.3  72:00 python
16292 freifunk  18   0 66124  64M  2216 S     2.9  7.3  82:45 python




Do I start it with "-t 3" then 5 threads are started:

$ pstree -a -c freifunk
python) /home/www.freifunk.net/Zope-2.6.2-linux2-x86/z2.py -t 3
  `-python) /home/www.freifunk.net/Zope-2.6.2-linux2-x86/z2.py -t 3
      `-python) /home/www.freifunk.net/Zope-2.6.2-linux2-x86/z2.py -t 3
          |-python) /home/www.freifunk.net/Zope-2.6.2-linux2-x86/z2.py -t 3
          |-python) /home/www.freifunk.net/Zope-2.6.2-linux2-x86/z2.py -t 3
          `-python) /home/www.freifunk.net/Zope-2.6.2-linux2-x86/z2.py -t 3

There always seem to be 2 more threads started then I want (4 instead of 2, 5 instead of 3).
Is this normal behaviour or a bug? 

Best regards,
Jens