Howto:Activate multi core support for OSG
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OSG threading support allows rendering-related computations (e.g., culling) to be offloaded to different threads.[1]
| Multithreading |
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Selecting threading modes
There is a property named /sim/rendering/multithreading-mode that can be set by using the --prop:/sim/rendering/multithreading-mode=... parameter. This affects directly the osgviewer threading mode, supported values are:
AutomaticSelectionCullDrawThreadPerContextDrawThreadPerContext(recommended)CullThreadPerCameraDrawThreadPerContext
In the launcher, you can click the "Settings" tab and paste --prop:/sim/rendering/multithreading-mode=... in the "Additional Settings" section. For example, you could paste --prop:/sim/rendering/multithreading-mode=DrawThreadPerContext.
If FG crashes, you can try running OSG_NOTIFY_LEVEL=WARN ./fgfs (or OSG_NOTIFY_LEVEL=INFO ./fgfs) to show logs from OpenSceneGraph.
Comparison of CPU usage
Before enabling multi-core support for OSG:
$ ps -T -o pid,tid,comm,stat,psr,pcpu,pmem,wchan,cmd -p $(pgrep -d, fgfs)
PID TID COMMAND STAT PSR %CPU %MEM WCHAN CMD
7706 7706 fgfs RLl 0 92.1 13.0 - /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 7762 QXcbEventQueue SLl 14 0.0 13.0 poll_s /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 7787 fgfs:disk$0 SNLl 0 0.0 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 7788 fgfs:sh0 SLl 18 0.0 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 7829 Qt bearer threa SLl 16 0.0 13.0 poll_s /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 7830 QDBusConnection SLl 2 0.0 13.0 poll_s /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 7989 fgfs:disk$0 SNLl 17 0.0 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 7990 fgfs:sh0 SLl 12 0.0 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 7991 fgfs:traceq0 SNLl 17 0.0 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 7992 fgfs:gdrv0 SLl 5 14.3 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 8008 fgfs SLl 9 0.3 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 8010 fgfs SLl 15 0.0 13.0 ep_pol /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 8011 fgfs SLl 14 0.0 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 8012 fgfs SLl 16 0.0 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 8013 fgfs SLl 15 0.0 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 8014 fgfs SLl 16 0.0 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 8015 fgfs SLl 1 0.0 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 8020 threaded-ml SLl 13 0.4 13.0 poll_s /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 8021 fgfs SLl 15 0.6 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 8022 fgfs SLl 19 0.0 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 8023 fgfs SLl 13 0.0 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 8025 fgfs SLl 6 10.1 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 8026 fgfs SLl 7 6.4 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 8027 fgfs SLl 5 6.6 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
7706 8028 fgfs SLl 6 9.2 13.0 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
After adding the --prop:/sim/rendering/multithreading-mode=DrawThreadPerContext parameter:
$ ps -T -o pid,tid,comm,stat,psr,pcpu,pmem,wchan,cmd -p $(pgrep -d, fgfs)
PID TID COMMAND STAT PSR %CPU %MEM WCHAN CMD
8447 8447 fgfs RLl 10 25.2 8.9 - /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8454 QXcbEventQueue SLl 12 0.0 8.9 poll_s /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8456 fgfs:disk$0 SNLl 13 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8457 fgfs:sh0 SLl 16 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8464 Qt bearer threa SLl 6 0.0 8.9 poll_s /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8465 QDBusConnection SLl 0 0.0 8.9 poll_s /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8470 Thread (pooled) SLl 16 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8471 Thread (pooled) SLl 10 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8472 Thread (pooled) SLl 14 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8473 Thread (pooled) SLl 9 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8474 Thread (pooled) SLl 3 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8475 Thread (pooled) SLl 12 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8476 Thread (pooled) SLl 0 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8477 Thread (pooled) SLl 16 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8478 Thread (pooled) SLl 13 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8479 Thread (pooled) SLl 8 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8480 Thread (pooled) SLl 6 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8481 Thread (pooled) SLl 11 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8482 Thread (pooled) SLl 2 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8483 Thread (pooled) SLl 5 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8484 Thread (pooled) SLl 17 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8485 Thread (pooled) SLl 7 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8486 Thread (pooled) SLl 11 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8487 Thread (pooled) SLl 18 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8488 Thread (pooled) SLl 15 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8489 Thread (pooled) SLl 19 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8494 fgfs:disk$0 SNLl 15 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8495 fgfs:sh0 SLl 15 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8496 fgfs:traceq0 SNLl 15 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8497 fgfs:gdrv0 SLl 10 0.8 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8534 fgfs SLl 11 13.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8539 fgfs SLl 17 0.0 8.9 ep_pol /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8540 fgfs SLl 19 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8541 fgfs SLl 14 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8542 fgfs SLl 19 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8543 fgfs SLl 14 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8544 fgfs SLl 1 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8549 threaded-ml SLl 18 0.2 8.9 poll_s /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8550 fgfs SLl 19 0.4 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8551 fgfs SLl 12 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8552 fgfs SLl 8 0.1 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8559 fgfs RLl 5 76.4 8.9 - /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8560 fgfs SLl 10 28.6 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8561 fgfs SLl 0 72.1 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8562 fgfs SLl 2 22.9 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
8447 8565 fgfs SLl 19 0.0 8.9 futex_ /mnt/f/Env/flightgear/linux/usr/bin/fgfs -
It can be seen that the CPU usage of the main thread has decreased.
Related content
- ThreadCPUAffinities
- https://forum.flightgear.org/viewtopic.php?p=69706#p69706
- https://forum.flightgear.org/viewtopic.php?t=8890
- https://www.mail-archive.com/osg-users@openscenegraph.net/msg09620.html
- https://www.mail-archive.com/osg-users@openscenegraph.net/msg09611.html
| References |