The locust python instance can use max 1 cpu core on macOS

Describe the bug

I have a simple locust file which hit an json rest endpoint. I start the load with 50 user with hatch rate 25. Then I try to keep adding users in the next run. No matter how many user I specify in the command, I can see that the CPU is only top at 100%CPU cores on my mac with 16CPU cores.

Expected behavior

I expect it to take more CPU and ram when the load is increasing.

Actual behavior

CPU only top at 1 full core never beyond that.

Steps to reproduce

run the locust command below with the python script at the same folder.

versions of python and locust

dev01:~$ locust --version
locust 1.1.1

dev01:~$ python3 -V
Python 3.8.4

dev01:~$ python -V
Python 2.7.16

Environment

• OS: MacOS 10.15.6

• Python version: 3.8.4

• Locust version: 1.1.1

• Locust command line that you ran: locust -f class-test-random-site-12month.py --host=https://report.dev.int --headless -u 500 -r 100 -t 3m --csv=result-12mon

• Locust file contents (anonymized if necessary):

import random
from locust import HttpUser, task, between
from locust.contrib.fasthttp import FastHttpUser

class QuickstartUser(HttpUser):
    wait_time = between(0, 0)
    @task
    def article_12mon(self):
        # top 20 stores in test data
        storeList = [7041,7011,7013,7047,7042, 7043, 7063]
        # top departments excluding seasonal/garden
        deptList = [27, 24, 59, 29, 25, 23]
        storeId = str(random.choice(storeList))
        deptId = str(random.choice(deptList))
        self.client.get("/dashboard/store/" + storeId + "/departments/" + deptId + "/classes?filterSelection=12MON", name="class-test - store: " + storeId + " - dept: " + deptId)

[lserranov]

https://docs.locust.io/en/stable/running-locust-distributed.html

That link is broken

[sangloe]

https://docs.locust.io/en/stable/running-locust-distributed.html

That link is broken

https://docs.locust.io/en/stable/running-distributed.html