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4.5. Examples of Using Tuna
Example 4.1. Assigning Tasks to Specific CPUs
The following example uses a system with four or more processors, and shows how to make all
ssh threads run on CPU 0 and 1, and all http threads on CPU 2 and 3.
#tuna --cpus=0,1 --threads=ssh\* --move --cpus=2,3 --threads=http\* --move
The above example command performs the following operations sequentially:
- Select CPUs 0 and 1.
- Select all threads that begin with
ssh. - Move the selected threads to the selected CPUs. Tuna sets the affinity mask of threads starting with
sshto the appropriate CPUs. The CPUs can be expressed numerically as 0 and 1, in hex mask as0x3, or in binary as11. - Reset the CPU list to 2 and 3.
- Select all threads that begin with
http. - Move the selected threads to the selected CPUs. Tuna sets the affinity mask of threads starting with
httpto the appropriate CPUs. The CPUs can be expressed numerically as 2 and 3, in hex mask as0xC, or in binary as1100.
Example 4.2. Viewing Current Configurations
The following example uses the
--show_threads (-P) parameter to display the current configuration, and then tests if the requested changes were made as expected.
#tuna--threads=gnome-sc\*\--show_threads\--cpus=0\--move\--show_threads\--cpus=1\--move\--show_threads\--cpus=+0\--move\--show_threadsthread ctxt_switches pid SCHED_ rtpri affinity voluntary nonvoluntary cmd 3861 OTHER 0 0,1 33997 58 gnome-screensav thread ctxt_switches pid SCHED_ rtpri affinity voluntary nonvoluntary cmd 3861 OTHER 0 0 33997 58 gnome-screensav thread ctxt_switches pid SCHED_ rtpri affinity voluntary nonvoluntary cmd 3861 OTHER 0 1 33997 58 gnome-screensav thread ctxt_switches pid SCHED_ rtpri affinity voluntary nonvoluntary cmd 3861 OTHER 0 0,1 33997 58 gnome-screensav
The above example command performs the following operations sequentially:
- Select all threads that begin with
gnome-sc. - Show the selected threads to enable the user to verify their affinity mask and RT priority.
- Select CPU 0.
- Move the
gnome-scthreads to the selected CPU (CPU 0). - Show the result of the move.
- Reset the CPU list to CPU 1.
- Move the
gnome-scthreads to the selected CPU (CPU 1). - Show the result of the move.
- Add CPU 0 to the CPU list.
- Move the
gnome-scthreads to the selected CPUs (CPUs 0 and 1). - Show the result of the move.
