master slave config, master not doing any work ?

[centminmod]

I have setup a master + slave Locust config and when I run a test, it seems the slave is the only one connecting to my target test site I am load testing ?

on target test site server i am checking netstat and it only shows the ip of the slave and nothing from master ? i tested with low 100 users and 100 user hatch rate

netstat -ntu | awk ' $5 ~ /^(::ffff:|[0-9|])/ { gsub("::ffff:","",$5); print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr

[Jahaja]

That's correct. The master only collects and aggregates the stats reported by each slave node.

[centminmod]

thanks for clarification, so I guess if i have enough resources, I can start a few slave threads on the master too ? how many cpu cores should I reserve for master locust work ?

something like

master 8 cpu threads

locust -H http://wordpress7.centminmod.com -f /home/locustfiles/locustfile_wp7.py --master &

for s in $(seq 4); do locust -H http://wordpress7.centminmod.com -f /home/locustfiles/locustfile_wp7.py --slave --master-host=masterip & done

slave 8 cpu threads

 for s in $(seq 8); do locust -H http://wordpress7.centminmod.com -f /home/locustfiles/locustfile_wp7.py --slave --master-host=masterip & done

[Jahaja]

It's different for each case. However, for a load test to be reliable the tool that's doing the load test should never be allowed to be the limiting factor, so I would advise you to make sure that no slave or master node are close to reaching a resource cap.

[centminmod]

thanks

seems even with 8 slaves + 4 slaves on master each locust process barely uses any cpu and memory resources between 1.7% and 3% cpu and 0.1% memory at 1000 users and hatch rate of 100 users over 12 slaves