How do i get to know the number of open channels of each and every running process? Using "analyze/system show proc/channel" is impractical on systems where a huge number of processes is running. Is there a way to get this information from a C program?
You could loop through all processes and use $GETJPI. $GETJPI item FILCNT will give you open file quota remaining to subtracting this from FILLM will give you number of files. However this does not count channels open to devices not files e.g terminals and mailboxes.
Volker's answer is the best, sending the output from SDA> sh proc/chan all to a file, but it depends on the pageable CCB area being in memory for each process. Not likely on a busy system.
Usually when someone asks this question, they're attempting to see how many channels are being used system-wide, their (incorrect) assumption is that CHANNELCNT is per system rather than per process.
The reason why I need this info is that some ACMS servers behaved badly; one of the hypothesis made by our development team was that the channelcnt parameter was underestimated, so I needed a per-process total of the number of I/O channel being used by the server processes. I adopted the "SDA> sho proc/chan all" solution to monitor the number of channels in use.
