How to stop docker-compose from doing unwanted replication

Question

I've got a very simple single-host docker compose setup:

version: "3"

services:
  bukofka:
    image: picoglavar
    restart: always
    environment:
    - PORT=8000
    - MODEL=/models/large
    volumes:
    - glavar:/models

  chlenix:
    image: picoglavar
    restart: always
    environment:
    - PORT=8000
    - MODEL=/models/small
    volumes:
    - glavar:/models

# ... other containers ...

As you can see, it's only two services based off a single image, so nothing special really. When I open up docker ps I can see these two services churning. And there I open htop and see that each python application is run at least four times; this is very surprising because I haven't setup any in-container kind of replication, and I'm not running this in any kind of swarm mode.

Why does this happen?

Answer 1

I'm a complete idiot. And colour blind too, apparently.

Note that the lines in green are threads, not processes: https://superuser.com/a/1496571/173193

per @nick-odell