Re: [hpoj-devel] experiences with SMP and RedHat 7

[Robert G. B. <rg...@ph...>]

On Tue, 12 Dec 2000, PASCHAL,DAVID (HP-Roseville,ex1) wrote:

> Hi.  I upgraded a spare PC to SMP and installed RedHat 7 and wanted to share
> my experiences with it.
>
> Once I got them set up, printing and scanning seemed to work, although they
> seemed slower on SMP.  So far I haven't been able to reproduce Robert's SMP
> printing problem, but I was only printing RedHat's ASCII and PostScript test
> pages.  I did have one locked up print job, but I think that was because I
> had a scan session open at the same time, which is a different bug.
>
> However, I had a hard time getting printing set up initially.  RedHat 7
> includes "LPRng" as opposed to "lpr".  For some reason, every time I
> restarted lpd, it reset the ownership and permissions on the wrapfilter
> script in the spool directory, making it non-executable.  The original
> filter script was not affected, however.  Finally I had to just move
> wrapfilter somewhere else, like /usr/local/bin, to make it work reliably.
> Of course, if I set up multiple queues like this, then I would have to give
> different names to each of the wrapfilter scripts.
>
> Has anybody else run into this problem with RedHat 7, or is there a better
> solution to prevent this problem (which appears to be a "security
> precaution" that goes too far)?  I will update PRINT-HOWTO with this
> information.

I've had no such problem with RH 6.2.  I'm about 2/3 of the way through
with grading, but I'm not sure I'll get the 2.2.17smp issue resolved by
Friday.

The other observation is that smp failure seems to be an issue of
probability (opportunity) and overall system activity.  Short print jobs
(defined in terms of the length of the messages sent, not how long it
takes to print them) aren't very likely to cause failure.  Try printing
large jpegs under varying conditions of CPU load.

   rgb

-- 
Robert G. Brown	                       http://www.phy.duke.edu/~rgb/
Duke University Dept. of Physics, Box 90305
Durham, N.C. 27708-0305
Phone: 1-919-660-2567  Fax: 919-660-2525     email:rg...@ph...