No longer logging interval stats when using LoadTestShape after 2.1.x

[dbfx]

Describe the bug

If I use any LoadTestShape test in 2.1.0 it will log interval statistics (CSV) every X seconds depending on CSV_STATS_INTERVAL_SEC.

However, from 2.2 (up to and including 2.4) it will not log the interval stats.

Expected behavior

Should see output like so:

 Aggregated                                                                            48     0(0.00%)  |     331      75    1089      99  |    2.10    0.00
----------------------------------------------------------------------------------------------------------------------------------------------------------------
 GET /                                                                                 48     0(0.00%)  |     331      75    1089      99  |    2.10    0.00
----------------------------------------------------------------------------------------------------------------------------------------------------------------
 Name                                                                              # reqs      # fails  |     Avg     Min     Max  Median  |   req/s failures/s

 Aggregated                                                                            44     0(0.00%)  |     353      75    1089     100  |    2.10    0.00
----------------------------------------------------------------------------------------------------------------------------------------------------------------
 GET /                                                                                 44     0(0.00%)  |     353      75    1089     100  |    2.10    0.00
----------------------------------------------------------------------------------------------------------------------------------------------------------------

Actual behavior

You see the shape launching debug info, but no aggregated stats etc.

Steps to reproduce

Use any LoadTestShape test, for example:

import math
from locust import HttpUser, TaskSet, task, between
from locust import LoadTestShape

class QuickstartUser(HttpUser):
    wait_time = between(5, 9)

    @task(1)
    def index_page(self):
        self.client.get("/")


class DoubleWave(LoadTestShape):
    """
    A shape to imitate some specific user behavior. In this example, midday
    and evening meal times. First peak of users appear at time_limit/3 and
    second peak appears at 2*time_limit/3
    Settings:
        min_users -- minimum users
        peak_one_users -- users in first peak
        peak_two_users -- users in second peak
        time_limit -- total length of test
    """

    min_users = 20
    peak_one_users = 60
    peak_two_users = 40
    time_limit = 300

    def tick(self):
        run_time = round(self.get_run_time())

        if run_time < self.time_limit:
            user_count = (
                (self.peak_one_users - self.min_users)
                * math.e ** -(((run_time / (self.time_limit / 10 * 2 / 3)) - 5) ** 2)
                + (self.peak_two_users - self.min_users)
                * math.e ** -(((run_time / (self.time_limit / 10 * 2 / 3)) - 10) ** 2)
                + self.min_users
            )
            return (round(user_count), round(user_count))
        else:
            return None    

Environment

• OS: Linux
• Python version: 3
• Locust version: 2.2, 2.4
• Locust command line that you ran: /usr/local/bin/locust -f ./shape.py --host https://testsite:443 --headless --csv=mycsv --csv-full-history -LDEBUG
• Locust file contents (anonymized if necessary): above

[cyberw]

Probably my fault (when refactoring/introducing —autostart). I’ll have a look in the coming week.