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Display exception when creating multiple SMARTS instances

See original GitHub issue

I encounter the “Display is not found” exception when trying to create multiple SMARTS instances:

截屏2020-11-19 10 19 23

To reproduce:

train_env = gym.make(
    "smarts.env:hiway-v0",
    scenarios=scenarios,
    agent_specs={AGENT_ID: agent_spec},
    headless=headless,
    visdom=False,
    timestep_sec=0.1,
    sumo_headless=True,
    seed=seed,
    # envision_record_data_replay_path="./data_replay",
)

test_env = gym.make(
    "smarts.env:hiway-v0",
    scenarios=scenarios,
    agent_specs={AGENT_ID: agent_spec},
    headless=headless,
    visdom=False,
    timestep_sec=0.1,
    sumo_headless=True,
    seed=seed,
    # envision_record_data_replay_path="./data_replay",
)

Development Environment:

OS: Ubuntu 16.04

Python: 3.7.4

SUMO: 1.7.0

SMARTS: 0.4.4

Issue Analytics

State:
Created 3 years ago
Comments:9 (3 by maintainers)

Top GitHub Comments

3reactions

Gamenotcommented, Nov 19, 2020

Hello @zbzhu99 , this is a known issue. SMARTS uses a few dependencies that have the requirement for a single instance in a process. In order to use another SMARTS instance in the same thread, the previous needs to be destroyed, or run on another process.

There is an example/multi_instance.py that shows one way to be able use more than one smarts environment using ray.

https://github.com/huawei-noah/SMARTS/blob/master/examples/multi_instance.py#L68-L162

2reactions

davidrusucommented, Dec 8, 2020

@alek5k Yeah we did hit that one with one of our users as well

Maybe you can find something of use from the other configuration options we tuned here:

https://github.com/huawei-noah/SMARTS/blob/master/smarts/core/smarts.py#L62-L68

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