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Is there a way to set the nice value of process and its affinity at the same time? For example:
taskset -c 0,1 nice -20 proc
Update: It works like this. I thought it must me something more complex.
754
CPU affinity enables binding a process or multiple processes to a specific CPU core in a way that the process(es) will run from that specific core only. When trying to perform performance testing on a host with many cores, it is wise to run multiple instances of a process, each one on different core.
You can change the scheduling priority of a running process to a value lower or higher than the base scheduling priority by using the renice command from the command line. This command changes the nice value of a process.
You can bind/pin a process to one or more CPUs. This increases the chances of more cache warmth/cache hits thus resulting in a much better performance.
Many CPU scheduling tools want a PID rather than a command. The following seems to work on my system:
# Using shell expansion to reliably use correct PID.
sudo nice -n18 schedtool -a 0,1 $(sleep 30 & echo $!) &
by using a shell expansion to get the PID of the last backgrounded process, but it seems hackish. The following seems cleaner, IMHO, but your mileage (and obviously the specifics of the scheduling tool you're using) may vary.
# Cleaner example with less hacking around.
nice -n18 sleep 30 &
sudo schedtool -a 0,1 $!
If supported, the -e flag seems to do what's needed by allowing a command instead of a PID. For example:
sudo schedtool -a 0,1 -e nice -n18 sleep 30 &
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