Scenario Simulator

This Python script simulates different scenarios for running commands with various delay patterns. It reads scenario configurations from a YAML file and executes them accordingly.

Usage

To run the simulator, use the following command:

python simulate.py ./scenarios/scenarios.yaml

Where scenarios.yaml is the path to your YAML configuration file containing the scenarios you want to run.

Requirements

• Python 3.x
• PyYAML library

Installation

Create a new virtual environment and run: pip install -r requirements.txt

Scenario Types

The simulator supports four different scenario types (listed below):

1. No Delay

   • Type: no_delay
   • Description: Runs the specified command multiple times without any delay between executions.
   • Parameters:
     • command: The command to run
     • times: Number of times to run the command

2. Random Delay

   • Type: random_delay
   • Description: Runs the command multiple times with a random delay between each execution.
   • Parameters:
     • command: The command to run
     • times: Number of times to run the command
     • max_delay: Maximum delay in seconds (delay will be random between 0 and this value)

3. Fixed Delay Block

   • Type: fixed_delay_block
   • Description: Runs the command in blocks, with a fixed delay after each block.
   • Parameters:
     • command: The command to run
     • times: Total number of times to run the command
     • k: Number of executions in each block
     • fixed_delay: Fixed delay in seconds after each block

4. Random Delay Block

   • Type: random_delay_block
   • Description: Runs the command in blocks, with a random delay after each block.
   • Parameters:
     • command: The command to run
     • times: Total number of times to run the command
     • k: Number of executions in each block
     • max_delay: Maximum delay in seconds after each block (delay will be random between 0 and this value)

5. Random Block Size with Fixed Delay

   • Type: random_block_size_fixed_delay
   • Description: Runs the command in blocks of random size, with a fixed delay after each block.
   • Parameters:
     • command: The command to run
     • times: Total number of times to run the command
     • max_block_size: Maximum size of each block (block size will be random between 1 and this value)
     • fixed_delay: Fixed delay in seconds after each block

6. Random Block Size with Random Delay

   • Type: random_block_size_random_delay
   • Description: Runs the command in blocks of random size, with a random delay after each block.
   • Parameters:
     • command: The command to run
     • times: Total number of times to run the command
     • max_block_size: Maximum size of each block (block size will be random between 1 and this value)
     • max_delay: Maximum delay in seconds after each block (delay will be random between 0 and this value)

Example YAML Configuration

scenarios:
  - name: "no_delay_scenario"
    type: "no_delay"
    command: "./print_timestamp.sh"
    times: 3

  - name: "random_delay_scenario"
    type: "random_delay"
    command: "./print_timestamp.sh"
    times: 5
    max_delay: 5

  - name: "fixed_delay_block_scenario"
    type: "fixed_delay_block"
    command: "./print_timestamp.sh"
    times: 4
    k: 3
    fixed_delay: 3

  - name: "random_delay_block_scenario"
    type: "random_delay_block"
    command: "./print_timestamp.sh"
    times: 4
    k: 3
    max_delay: 3

  - name: "random_block_size_fixed_delay_scenario"
    type: "random_block_size_fixed_delay"
    command: "./print_timestamp.sh"
    times: 12
    max_block_size: 6
    fixed_delay: 1  # seconds

  - name: "random_block_size_random_delay_scenario"
    type: "random_block_size_random_delay"
    command: "./print_timestamp.sh"
    times: 12
    max_block_size: 4
    max_delay: 6  # seconds