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Top Forums Programming Problem with external program launch Post 302289938 by Zipi on Friday 20th of February 2009 08:25:03 PM
Old 02-20-2009
Quote:
-2 is actually a lower priority, not a higher one; the higher the number, the higher the priority. What priority and scheduler did you modify it to to get it to function, exactly?
Oh i'm such a newbie Smilie I got confused with the niceness concept,which has a reversed logic (higher number <=> higher niceness <=> lower priority)....

About your question:i honestly don't know very well how the original programmer has set the program's priority,but,using the "chrt -p" command i found out it has a SCHED_RR policy with a priority 0.
I have then used the chrt command to set the child process' policy to SCHED_OTHER (which forces me to use a 0 priority).So i guess that what made it work is the fact that i downgraded the child process from real time to normal (but i'm not sure...can you confirm that?)

Besides,i confess i'm beginning to be a tad confused....After reading your reply i read some more internet resources,finding out about static and dynamic priority,and about their ranges...but also finding some contraddictory informations...see for example www.csd.uwo.ca/courses/CS3305a/Lectures/casestudies.ppt and ATAD #21 - Linux process priority range A Tip A Day [:: ATAD ::] ....One says that static priority ranges from 0 to 99,the other from -20 to 19....

Lastly,what does the PR value i can see in the "top" command output mean?

Thank you so much for you help,i do appreciate it Smilie
 

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gst-launch-ext-0.8(1)						   User Commands					     gst-launch-ext-0.8(1)

NAME
gst-launch-ext-0.8, gst-launch-ext - run a predefined GStreamer pipeline SYNOPSIS
gst-launch-ext-0.8 filename [filename...] [gst-std-options] gst-launch-ext filename [filename...] [gst-std-options] DESCRIPTION
gst-launch-ext-0.8 runs a basic predefined GStreamer pipeline, and prints the name of the pipeline. gst-launch-ext-0.8 is only used as a quick test to ensure that codecs and GStreamer work properly. gst-launch-ext-0.8 does not handle more advanced features such as synchro- nization. OPTIONS
The following options are supported by gst-launch-ext-0.8 and gst-launch-ext: gst-std-options Standard options available for use with most GStreamer applications. See gst-std-options(5) for more information. The following options are supported by gst-launch-ext only: --gst-list-mm List found major/minor versions. This option displays the versions that are available. --gst-mm=string Force major/minor version. This option enables you to specify a specific version to run, if you do not want to run the default version. --print Print wrapped command line. This option displays the command that will be run, and then runs the command. OPERANDS
The following operands are supported: filename The name of the GStreamer pipeline to run. EXTENDED DESCRIPTION
gst-launch-ext-0.8 can be configured by creating a .gst file in your home directory. This PERL-style configuration file can override the default values for audio and video output sinks. The following example .gst file implements the same defaults as those hard-coded in the script: AUDIOSINK = osssink VIDEOSINK = ffmpegcolorspace ! xvimagesink You can change osssink to esdsink, alsasink, or sunaudiosink, and you can change xvimagesink to ximagesink, aasink, or sdlvideosink. You must have the appropriate plugin installed on the system to use the specified output sink. Other GStreamer plug-ins can also be used. EXAMPLES
Example 1: Launching a GStreamer Pipeline example% gst-launch-ext-0.8 filename EXIT STATUS
The following exit values are returned: 0 Application exited successfully >0 Application exited with failure FILES
The following files are used by this application: /usr/bin/gst-launch-ext-Executable to run a predefined GStreamer pipeline ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWgnome-media | +-----------------------------+-----------------------------+ |Interface stability |External | +-----------------------------+-----------------------------+ SEE ALSO
Latest version of the GNOME Desktop User Guide for your platform. gst-complete(1), gst-compprep(1), gst-feedback(1), gst-inspect(1), gst-launch(1), gst-md5sum(1), gst-register(1), gst-thumbnail(1), gst- typefind(1), gst-xmlinspect(1), gst-xmllaunch(1), gstreamer-properties(1), libgstreamer-0.8(3), libgstgetbits(3), gst-std-options(5) NOTES
Written by Brian Cameron, Sun Microsystems Inc., 2004. SunOS 5.10 14 Oct 2004 gst-launch-ext-0.8(1)
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