topic Re: Question about "streampipes" kernel parameter in Operating System - HP-UX

Question about "streampipes" kernel parameter

Douglas D. Denney — Fri, 21 Apr 2006 11:51:06 GMT

I've just performed my first SAS install on an Integrity server (rx2600) and ran into an issue. The install refused to continue unless the "streampipes" kernel paremeter was set to "1". I did this, rebooted and all is well. However, I am now wondering the following:

1. What is the impact of setting streampipes to 1?
2. Will system performance be impacted (ie, degraded)?

Any help that anyone can give me would be appreciated. Thanks,
Douglas Denney

Re: Question about "streampipes" kernel parameter

Kent Ostby — Fri, 21 Apr 2006 12:11:09 GMT

Take a look here:

http://docs.hp.com/en/B3921-90010/streampipes.5.html

Re: Question about "streampipes" kernel parameter

Kent Ostby — Fri, 21 Apr 2006 12:12:47 GMT

What operating system are you using?

There were some issues in 11.00 where the performance of shell scripts dropped due to the use of streampipes.

Re: Question about "streampipes" kernel parameter

Douglas D. Denney — Fri, 21 Apr 2006 12:24:18 GMT

The OS is HPUX 11.23 on itanium

Re: Question about "streampipes" kernel parameter

Douglas D. Denney — Fri, 21 Apr 2006 12:26:22 GMT

I have looked at this doc:

http://docs.hp.com/en/B3921-90010/streampipes.5.html

and didn't feel that it answered the questions posed above. This document is an overview and tells you that by enabling it to a "1" you change to stream-based pipes. Okay, what does that mean? How will it affect the system? If stream-based pipes are such a good thing, then why is the recommendation from HP to turn it off unless you need it?

Thanks,
Doug

Re: Question about "streampipes" kernel parameter

Kent Ostby — Fri, 21 Apr 2006 12:35:33 GMT

The reason is that ksh scripts can take a performance hit.

There is a fix for it on 11.23 in PHNE_32277 and following.

Re: Question about "streampipes" kernel parameter

Douglas D. Denney — Tue, 15 Aug 2006 13:20:23 GMT

resolved problem. closing thread.