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HP-UX 11i v3 deprecates STREAMS/UX supsched process

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Abstract

On HP-UX 11i v3, the usage of the supsched process has been deprecated, leaving only smpsched. The kernel parameter NSTRSCHED still control the number of smpsched processes, the system determines the number of daemons to run based on the number of processors in the system (0) or a positive non zero tunable value is the number of "smpsched" daemons that will be created on an MP system.

Command like "ps -ef | grep [s]upsched" will not show any running process in current HP-UX 11i v3 systems.

HP and third party process monitoring tools configured to monitor this process, may produce errors messages on HP-UX 11i v3 systems were the process is not longer used.

Available Documentation

02/07 STREAMS/UX Programmer’s Guide NSTRSCHED(5) Appendix

In the latest STREAMS/UX Programmer’s Guide - HP-UX 11i v3 -(Edition 1) http://docs.hp.com/en/5991-7416/5991-7416.pdf, page 302, the supsched process has been removed from the NSTRSCHED(5) manpage.

"This tunable defines the number of STREAMS scheduler daemons to be run on a system. If the tunable value is set to zero, the system determines the number of daemons to run based on the number of processors in the system. A positive non zero tunable value is the number of "smpsched" daemons that will be created on an MP system."

02/07 11i v3 (11.31) NSTRSCHED(5) manpage

In the previous 11i v3 NSTRSCHED(5) manpage (http://docs.hp.com/en/B2355-60103/NSTRSCHED.5.html) , the old reference to the usage of the supsched process is still there:

"This tunable defines the number of multiprocessor (MP) STREAMS scheduler daemons to run on systems containing more than one processor. Note that uniprocessor (UP) systems do not use an MP scheduler daemon, but both MP and UP systems always have one UP STREAMS scheduler (supsched)."

08/03 11i v2 (11.23) NSTRSCHED(5) manpage

The 11i v2 manpage (http://docs.hp.com/en/B2355-60130/NSTRSCHED.5.html) still mentions the usage of the supsched process:

"This tunable defines the number of multiprocessor (MP) STREAMS scheduler daemons to run on systems containing more than one processor. Note that uniprocessor (UP) systems do not use an MP scheduler daemon, but both MP and UP systems always have one UP STREAMS scheduler (supsched)."

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This page was last modified on 19 June 2009, at 00:43. This page has been accessed 5,915 times.