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Operating System - OpenVMS
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Maximum TCP connections per process

 
Nicolau Roca
Advisor

Maximum TCP connections per process

Hi,
how do I know the maximum number of TCP connections per process on OpenVMS?

(I need this information in order to determine the number of dispatcher processes in an Oracle Shared Server configuration)

Thank you,
Nicolau
6 REPLIES
labadie_1
Honored Contributor

Re: Maximum TCP connections per process

Hello

Fillm sets the maximum number of files and active network logical links.
So it is more or less fillm (and your fillm should be less than CHANNELCNT, the system-wide limit)
Ian Miller.
Honored Contributor

Re: Maximum TCP connections per process

and a big enough BYTLM quota to support that
____________________
Purely Personal Opinion
Robert Gezelter
Honored Contributor

Re: Maximum TCP connections per process

Nicolau,

I think that we need to go back a step. Are you counting the number of possible connections, or the number of connections that the Oracle client side will establish?

The two are almost assuredly different. For most (single threaded) code, I would suspect that the correct guess would be one per process (should be confirmed from the appropriate Oracle documentation).

- Bob Gezelter, http://www.rlgsc.com
Wim Van den Wyngaert
Honored Contributor

Re: Maximum TCP connections per process

To see the maximum number of connections system wide (ucx show comm in the old days) :
ana/sys
SDA> tcpip show inetcb/stat
...
ACT/PEAK/MAX_SOCKET

Will show the maximum (10000 in my case).
See also
http://forums12.itrc.hp.com/service/forums/questionanswer.do?admit=109447627+1211185608007+28353475&threadId=1169204

Wim
Wim
Nicolau Roca
Advisor

Re: Maximum TCP connections per process

Hi,
from Oracle documentation I have seen that each BG device consumes 1472 bytes of the process BYTLM quota.

So un upper limit for the number of concurrent TCP connections for a process is /1472

Thank you all

Regards,
Nicolau
Wim Van den Wyngaert
Honored Contributor

Re: Maximum TCP connections per process

Also check sysgen channelcnt. It may change the limit downwards ...

Best is to write a program that creates sockets and see how many channels you can open.

Wim
Wim