# Day: A Performant Discrete-Event Simulator for Network Simulations
Developed with the Rust programming language, **Day** has been designed as a performant discrete-event simulator for network simulations. It uses stackless coroutines in asynchronous Rust to implement the [actor model](https://en.wikipedia.org/wiki/Actor_model), where each actor can only interact with its counterparts using message passing. It excels at both small-scale and large-scale network simulations due to its ability to use either a single-threaded or a multi-threaded runtime; the single-threaded runtime minimizes overhead, while the multi-threaded runtime utilizes multiple CPU cores concurrently in the same simulation run.
To run a network simulation session using a configuration file, run:
```
RUST_LOG=debug day configs/simple.toml
```
where `RUST_LOG` levels can be `error`, `warn`, `info`, `debug`, and `trace`.
## Configuration Settings
In **Day**, all configuration settings are read from a configuration file when a simulation session starts, and the configuration file follows the `TOML` format for the sake of simplicity and readability.
Here is an example configuration file `simple.toml`:
```toml
# An example configuration file that shows a basic setup.
seed = 1000
edges = [[0, 1], [0, 2]]
hosts = [0, 1, 2]
report_interval = 2.0
duration = 20.0
num_threads = 1
log_path = "./simple"
[switch]
port_rate = 8000
capacity = 100
weights = [1]
discipline = "FIFO"
drop = "RED"
[[flow]]
flow_type = "PacketDistribution"
graph = [[0, 1]]
[flow.traffic]
initial_delay = 1.0
size = 10000
arr_dist = {type = "Exp", lambda = 1.0}
pkt_size_dist = {type = "Uniform", low = 1000, high = 1500}
[[flow]]
flow_type = "PacketDistribution"
graph = [[1, 0]]
[flow.traffic]
initial_delay = 2.0
duration = 10.0
arr_dist = {type = "Uniform", low = 1, high = 1}
pkt_size_dist = {type = "Uniform", low = 1000, high = 1500}
[[collective]]
collective_type = "Broadcast"
flow_type = "PacketDistribution"
flow_count = 2
graph = [[0, 1], [0, 2]]
sources = [0]
sinks = [1, 2]
[collective.traffic]
initial_delay = 1.0
duration = 10.0
arr_dist = {type = "Uniform", low = 1, high = 1}
pkt_size_dist = {type = "Uniform", low = 1000, high = 1500}
```
The following introduces all the possible settings in the configuration file.
### General
#### seed
The seed for the random number generator to ensure reproducibility of the simulation results.
- **Valid value**: Integer
- **Required**: Yes
- **Example**:
```toml
seed = 1000
```
#### duration
The total duration of the simulation in seconds.
- **Valid value**: Floating point number
- **Required**: No
- **Default**: 1500.0
- **Example**:
```toml
duration = 20.0
```
#### report_interval
The `report_interval` parameter specifies the time interval to log reports from all elements in the simulation.
- **Valid value**: Floating point number
- **Required**: No
- **Default**: f64::MAX (No reports when the simulation is in progress, all reports are logged at the end.)
- **Example**:
```toml
report_interval = 1.0
```
#### ui_interval
**Day** provides a user interface, which for now includes a progress bar to visualize the progression of a simulation session. This `ui_interval` element specifies the time interval to advance the position of the progress bar.
- **Valid value**: Floating point number
- **Required**: No
- **Default**: `duration` / 100
- **Example**:
```toml
ui_interval = 1.0
```
#### num_threads
The number of threads to be used in the simulation run. By setting this value to 1, the single-threaded runtime will be used instead of the default multi-threaded runtime.
#### log_path
**Day** generates three CSV files, `sources.csv`, `sinks.csv`, and `switches.csv`, containing statistics of a simulation session. `log_path` specifies the directory of the three CSV files.
- **Valid value**: String
- **Required**: No
- **Default**: `./output`
- **Example**:
```toml
log_path = "./test"
```
#### topology
**Day** supports arbitrary topologies. Besides widely-used topologies `FatTree` and `Torus`, any topology that can be specified as an undirected graph can be supported as well.
- `FatTree`
To specify the `FatTree` topology, it is required to specific `k`. `k` is a multiple of 2.
**Example**:
```toml
[topology]
category = "FatTree"
[topology.torus]
k = 8
```
- `Torus`
To specify the `Torus` topology, it is required to specific dimension `dim`, and node per dimension `n`. Only 1D, 2D, and 3D Torus topologies are supported. That is, valid values of `dim` are 1, 2, 3.
**Example**:
```toml
[topology]
category = "Torus"
[topology.torus]
dim = 2
n = 3
```
- Custom topology
Use `edges` to specify an undirected graph as the topology, and `hosts` to specify hosts in the topology.
`edges` is a vector of [integer, integer]. An [integer, integer] pair presents an edge in the undirected graph.
`hosts` is a vector of integers
**Example**:
```toml
edges = [[0, 1], [0, 2]]
hosts = [0, 1, 2]
```
### Switch
In **Day**, all switches use the same setting which can be specified with the following attributes.
#### port_rate
The bit rate of each outbound port.
- **Valid value**: Floating point number
- **Required**: Yes
- **Example**:
```toml
port_rate = 8000
```
#### capacity
The capacity (buffer size) of each outbound port.
- **Valid value**: Integer
- **Required**: Yes
- **Example**:
```toml
capacity = 100
```
#### drop
The packet drop strategy that drops packets when the buffer is full.
- **Valid value**:
| Value | Meaning |
| :--------: | ----------------------------------------- |
| `TailDrop` | Dropping packets at the tail of the queue |
| `RED` | Random Early Detection |
- **Required**: Yes
- **Example**:
```toml
capacity = 100
```
#### discipline
The scheduling discipline.
- **Valid value**:
| Value | Meaning | Notes |
| :----: | ---------------------- | -------------------------------- |
| `FIFO` | First In First Out |
| `DRR` | Deficit Round Robin | Required to specify `weights` |
| `WFQ` | Weighted Fair Queueing | Required to specify `weights` |
| `SP` | Static Priority | Required to specify `priorities` |
| `VC` | Virtual Clock | Required to specify `vticks` |
- **Required**: Yes
- **Example**:
```toml
discipline = "FIFO"
```
#### weights
- **Valid value**: Vector of integers
- **Required**: Yes if `dispcipline = "DRR"` or `dispcipline = "WFQ"`
- **Example**:
```toml
weights = [1, 2, 3]
```
#### priorities
- **Valid value**: Vector of (integer, integer), where the first integer is the flow class and the second integer is the priority of this flow class
- **Required**: Yes if `dispcipline = "SP"`
- **Example**:
```toml
priorities = [(0, 2), (1, 1)]
```
#### vticks
- **Valid value**: Vector of (integer, integer), where the first integer is the flow class and the second integer is the inverse of the desired rates for the corresponding flows, in bits per second
- **Required**: Yes if `dispcipline = "VC"`
- **Example**:
```toml
vticks = [(0, 2), (1, 1)]
```
### Flow
In **Day**, flows can be specified one by one:
```toml
[[flow]]
flow_id = 2
starts_before = [3]
starts_after = [1]
flow_type = "PacketDistribution"
graph = [[0, 1]]
[flow.traffic]
initial_delay = 1.0
duration = 2.0
arr_dist = {type = "Uniform", low = 1, high = 1}
pkt_size_dist = {type = "Uniform", low = 1000, high = 1500}
```
or by sets:
```toml
[[flow_set]]
first_flow_id = 10
flow_type = "PacketDistribution"
flow_count = 10
[flow_set.traffic]
initial_delay = 0.0
duration = 10.0
arr_dist = {type = "Uniform", low = 0.0008, high = 0.0008} # 10Mbps
pkt_size_dist = {type = "Uniform", low = 1024, high = 1024}
```
The following table lists required, optional, or not supported attributes of a flow or a flow set.
| Attribute | Meaning | flow | flow_set |
| :-------------: | ------------------------------------------------------------------------------------- | :------: | :------: |
| `flow_id` | The id of the flow | optional | no |
| `first_flow_id` | The smallest flow id of the flow set | no | optional |
| `starts_before` | The ids of flows that cannot start until this flow / flow set ends | optional | optional |
| `starts_after` | The ids of flows that this flow / flow set must wait for them to end before it starts | optional | optional |
| `flow_type` | The type of the flow or flows of the flow set | required | required |
| `flow_count` | The number of flows in the flow set | no | required |
| `graph` | The pair of the source host and the sink host of the flow | required | no |
| `path` | The path of the flow | optional | no |
| `traffic` | The traffic of the flow / flow set | required | required |
#### flow_id
The id of the flow.
If not specified, the id of the first flow specified in the configuration file will be 0, and the subsequent ids of flows increase by 1.
- **Valid value**: Integer
- **Required**: No
- **Example**:
```toml
flow_id = 1
```
#### first_flow_id
The smallest flow id of the flow set.
- **Valid value**: Integer
- **Required**: No
- **Example**:
```toml
flow_first_id = 1
```
#### starts_before
The ids of flows that cannot start until this flow / flow set ends.
- **Valid value**: Vector of integers
- **Required**: No
- **Example**:
```toml
starts_before = [3, 4]
```
#### starts_after
The ids of flows that this flow / flow set must wait for them to end before it starts.
- **Valid value**: Vector of integers
- **Required**: No
- **Example**:
```toml
starts_after = [0, 1]
```
#### flow_type
The type of the flow or flows of the flow set.
- **Valid value**:
| Value | Meaning |
| :------------------: | ------------------------------------------------------------------------------------------------------------ |
| `PacketDistribution` | A flow whose packet source sends packets with specific distributions of inter-arrival times and packet sizes |
| `TCP` | A flow whose packet source simulate the TCP protocol |
- **Required**: Yes
- **Example**:
```toml
flow_type = "PacketDistribution"
```
#### flow_count
The number of flows in the flow set.
- **Valid value**: Integer
- **Required**: Yes for a flow set
- **Example**:
```toml
flow_count = 10
```
#### graph
The pair of the source host and the sink host of the flow.
- **Valid value**: [[integer, integer]]
- **Required**: Yes for a single flow
- **Example**:
```toml
graph = [[0, 2]]
```
#### path
The path of the flow.
- **Valid value**: Vector of integers where each integer is a node in the path
- **Required**: No
- **Example**:
```toml
path = [0, 1, 2]
```
#### traffic
For a flow, it must specify its traffic under `[flow.traffic]`.
For a flow set, it must specify the traffic of its flows under `[flow_set.traffic]`.
The following table lists attributes of traffic.
> Note:
>
> - `initial_delay`, `arr_dist`, and `pkt_size_dist` are required.
> - Either `size` or `duration` is required.
> - If `flow_type = "TCP"`, `[flow.traffic.tcp]` or `[flow_set.traffic.tcp]` must be specified for the flow or flow set.
- **Attributes**:
| Attribute | Meaning | Valid Value |
| :-------------: | -------------------------------------------------------------------------- | ----------------------- |
| `initial_delay` | The seconds the flow / flow set waits before producing its first packet | Floating point number |
| `size` | The total size of packets of the flow / each flow of the flow set in bytes | Integer |
| `duration` | The duration of the flow / each flow of the flow set in seconds | Floating point number |
| `arr_dist` | The arrival distribution of packets in seconds | Valid distribution info |
| `pkt_size_dist` | The distribution of packet sizes in bytes | Valid distribution info |
> Valid distribution info includes uniform distribution and exponential distribution:
>
> - {type = "Uniform", low = 0.0008, high = 0.0008}
> - {type = "Exp", lambda = 1.0}
- **Required**: Yes
- **Example**:
```toml
[[flow_set]]
flow_type = "TCP"
flow_count = 100
[flow_set.traffic]
initial_delay = 0.0
duration = 0.1
arr_dist = {type = "Uniform", low = 0.0008, high = 0.0008}
pkt_size_dist = {type = "Uniform", low = 1024, high = 1024}
[flow_set.traffic.tcp]
cc_algorithm = "TCPReno"
```
#### traffic.tcp
For a flow, it must specify its tcp characteristics under `[flow.traffic.tcp]`.
For a flow set, it must specify the tcp characteristics of its flows under `[flow_set.traffic.tcp]`.
- **Attributes**:
| Attribute | Meaning | Valid Value |
| :------------: | -------------------------------- | --------------------- |
| `cc_algorithm` | The congestion control algorithm | `TCPReno`, `TCPCubic` |
- **Required**: Yes
- **Example**:
```toml
[flow.traffic.tcp]
cc_algorithm = "TCPReno"
```
### Collective
In **Day**, collectives can be specified one by one:
```toml
[[collective]]
collective_type = "Broadcast"
flow_type = "PacketDistribution"
flow_count = 2
graph = [[0, 2], [0, 3], [1, 2], [1, 3]]
sources = [0, 1]
sinks = [2, 3]
[collective.traffic]
initial_delay = 1.0
duration = 10.0
arr_dist = {type = "Uniform", low = 1, high = 2}
pkt_size_dist = {type = "Uniform", low = 1000, high = 1500}
```
or by sets:
```toml
[[collective_set]]
collective_type = "Gather"
collective_count = 2
flow_type = "PacketDistribution"
flow_count = 2
sources = [[0, 1], [1, 2]]
sinks = [[2, 2], [3, 3]]
[collective_set.traffic]
initial_delay = 1.0
duration = 10.0
arr_dist = {type = "Uniform", low = 3, high = 4}
pkt_size_dist = {type = "Uniform", low = 2000, high = 2500}
```
The following table lists required, optional, or not supported attributes of a collective or a collective set.
| Attribute | Meaning | collective | collective_set |
| :----------------: | --------------------------------------------------------------------------------- | :--------: | :------------: |
| `collective_type` | The type of the collective or collective set | required | required |
| `first_flow_id` | The smallest flow id of the collective or collective set | optional | optional |
| `collective_count` | The number of collectives in the collective set | no | required |
| `flow_type` | The type of the flows of the collective or collective set | required | required |
| `flow_count` | The number of flows in the collective or in each collective of the collective set | required | required |
| `graph` | The pairs of the source host and the sink host of the collective's flows | optional | no |
| `paths` | The paths of the collective's flows | optional | no |
| `sources` | The sources of flows | optional | optional |
| `sinks` | The sinks of flows | optional | optional |
| `traffic` | The traffic of the collective / collective set | required | required |
#### collective_type
The type of the collective or collective set.
- **Valid value**: `Brordcast` or `Gather`
- **Required**: Yes
- **Example**:
```toml
collective_type = "Broadcast"
```
#### first_flow_id
The smallest flow id of the collective / collective set.
- **Valid value**: Integer
- **Required**: No
- **Example**:
```toml
flow_first_id = 1
```
#### collective_count
The number of collectives in the collective set.
- **Valid value**: Integer
- **Required**: Yes for a collective set
- **Example**:
```toml
collective_count = 10
```
#### flow_count
The number of flows in the collective or in each collective of the collective set.
- **Valid value**: Integer
- **Required**: Yes
- **Example**:
```toml
flow_count = 4
```
#### graph
The pairs of the source hosts and the sink hosts of the collective's flows.
- **Valid value**: Vector of [integer, integer]
- **Required**: No
- **Example**:
```toml
graph = [[0, 1], [0, 2]]
```
#### paths
The paths of the collective's flows.
- **Valid value**: Vector of vectors of integers where each integer is a node in the path
- **Required**: No
- **Example**:
```toml
paths = [[0, 1], [0, 1, 2]]
```
#### sources
For a collective, `sources` is the set of the source hosts of this collective's flows.
- **Valid value**: Vector of integers where each integer is a source host
- **Required**: No
- **Example**:
```toml
sources = [0, 1]
```
For a collective set, `sources` is set of the source hosts of this collective set's collectives' flows.
- **Valid value**: Vector of vectors of integers where each vector is a collective's flows' source hosts
- **Required**: No
- **Example**:
```toml
sources = [[0, 0], [1, 1]]
```
#### sinks
For a collective, `sinks` is the set of the sink hosts of this collective's flows.
- **Valid value**: Vector of integers where each integer is a sink host
- **Required**: No
- **Example**:
```toml
sinks = [0, 1]
```
For a collective set, `sinks` is set of the sink hosts of this collective set's collectives' flows.
- **Valid value**: Vector of vectors of integers where each vector is a collective's flows' sink hosts
- **Required**: No
- **Example**:
```toml
sinks = [[0, 0], [1, 1]]
```
#### traffic
For a collective, it must specify the traffic of its flows under `[collective.traffic]`.
For a collective set, it must specify the traffic of its flows under `[collective_set.traffic]`.
The following table lists attributes of traffic.
> Note:
>
> - `initial_delay`, `arr_dist`, and `pkt_size_dist` are required.
> - Either `size` or `duration` is required.
> - If `flow_type = "TCP"`, `[flow.traffic.tcp]` or `[flow_set.traffic.tcp]` must be specified for the flow or flow set.
- **Attributes**:
| Attribute | Meaning | Valid Value |
| :-------------: | ----------------------------------------------------------------------------------- | ----------------------- |
| `initial_delay` | The seconds the collective / collective set waits before producing its first packet | Floating point number |
| `size` | The total size of packets of each flow of the collective / collective set in bytes | Integer |
| `duration` | The duration of each flow of the collective / collective set in seconds | Floating point number |
| `arr_dist` | The arrival distribution of packets in seconds | Valid distribution info |
| `pkt_size_dist` | The distribution of packet sizes in bytes | Valid distribution info |
> Valid distribution info includes uniform distribution and exponential distribution:
>
> - {type = "Uniform", low = 0.0008, high = 0.0008}
> - {type = "Exp", lambda = 1.0}
- **Required**: Yes
- **Example**:
```toml
[[collective]]
collective_type = "Broadcast"
flow_type = "PacketDistribution"
flow_count = 4
[collective.traffic]
initial_delay = 1.0
duration = 10.0
arr_dist = {type = "Uniform", low = 3, high = 4}
pkt_size_dist = {type = "Uniform", low = 2000, high = 2500}
```
#### traffic.tcp
For a collective, it must specify the tcp characteristicsc of its flows under `[collective.traffic.tcp]`.
For a collective set, it must specify the tcp characteristics of its collectives' flows under `[collective_set.traffic.tcp]`.
- **Attributes**:
| Attribute | Meaning | Valid Value |
| :------------: | -------------------------------- | --------------------- |
| `cc_algorithm` | The congestion control algorithm | `TCPReno`, `TCPCubic` |
- **Required**: Yes
- **Example**:
```toml
[collective.traffic.tcp]
cc_algorithm = "TCPReno"
```
Raw data
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"name": "dayone",
"maintainer": null,
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"maintainer_email": null,
"keywords": "network, simulation, framework, time, discrete, events",
"author": "Baochun Li <bli@ece.toronto.edu>",
"author_email": "Baochun Li <bli@ece.toronto.edu>",
"download_url": null,
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"description": "# Day: A Performant Discrete-Event Simulator for Network Simulations\n\nDeveloped with the Rust programming language, **Day** has been designed as a performant discrete-event simulator for network simulations. It uses stackless coroutines in asynchronous Rust to implement the [actor model](https://en.wikipedia.org/wiki/Actor_model), where each actor can only interact with its counterparts using message passing. It excels at both small-scale and large-scale network simulations due to its ability to use either a single-threaded or a multi-threaded runtime; the single-threaded runtime minimizes overhead, while the multi-threaded runtime utilizes multiple CPU cores concurrently in the same simulation run.\n\nTo run a network simulation session using a configuration file, run:\n\n```\nRUST_LOG=debug day configs/simple.toml\n```\n\nwhere `RUST_LOG` levels can be `error`, `warn`, `info`, `debug`, and `trace`.\n\n## Configuration Settings\n\nIn **Day**, all configuration settings are read from a configuration file when a simulation session starts, and the configuration file follows the `TOML` format for the sake of simplicity and readability.\n\nHere is an example configuration file `simple.toml`:\n\n```toml\n# An example configuration file that shows a basic setup.\n\nseed = 1000\nedges = [[0, 1], [0, 2]]\nhosts = [0, 1, 2]\nreport_interval = 2.0\nduration = 20.0\nnum_threads = 1\nlog_path = \"./simple\"\n\n[switch]\nport_rate = 8000\ncapacity = 100\nweights = [1]\ndiscipline = \"FIFO\"\ndrop = \"RED\"\n\n[[flow]]\nflow_type = \"PacketDistribution\"\ngraph = [[0, 1]]\n[flow.traffic]\n initial_delay = 1.0\n size = 10000\n arr_dist = {type = \"Exp\", lambda = 1.0}\n pkt_size_dist = {type = \"Uniform\", low = 1000, high = 1500}\n\n[[flow]]\nflow_type = \"PacketDistribution\"\ngraph = [[1, 0]]\n[flow.traffic]\n initial_delay = 2.0\n duration = 10.0\n arr_dist = {type = \"Uniform\", low = 1, high = 1}\n pkt_size_dist = {type = \"Uniform\", low = 1000, high = 1500}\n\n[[collective]]\ncollective_type = \"Broadcast\"\nflow_type = \"PacketDistribution\"\nflow_count = 2\ngraph = [[0, 1], [0, 2]]\nsources = [0]\nsinks = [1, 2]\n[collective.traffic]\n initial_delay = 1.0\n duration = 10.0\n arr_dist = {type = \"Uniform\", low = 1, high = 1}\n pkt_size_dist = {type = \"Uniform\", low = 1000, high = 1500}\n\n```\n\nThe following introduces all the possible settings in the configuration file.\n\n### General\n\n#### seed\n\nThe seed for the random number generator to ensure reproducibility of the simulation results.\n\n- **Valid value**: Integer\n- **Required**: Yes\n- **Example**:\n\n ```toml\n seed = 1000\n ```\n\n#### duration\n\nThe total duration of the simulation in seconds.\n\n- **Valid value**: Floating point number\n- **Required**: No\n- **Default**: 1500.0\n- **Example**:\n\n ```toml\n duration = 20.0\n ```\n\n#### report_interval\n\nThe `report_interval` parameter specifies the time interval to log reports from all elements in the simulation.\n\n- **Valid value**: Floating point number\n- **Required**: No\n- **Default**: f64::MAX (No reports when the simulation is in progress, all reports are logged at the end.)\n- **Example**:\n\n ```toml\n report_interval = 1.0\n ```\n\n#### ui_interval\n\n**Day** provides a user interface, which for now includes a progress bar to visualize the progression of a simulation session. This `ui_interval` element specifies the time interval to advance the position of the progress bar.\n\n- **Valid value**: Floating point number\n- **Required**: No\n- **Default**: `duration` / 100\n- **Example**:\n\n ```toml\n ui_interval = 1.0\n ```\n\n#### num_threads\n\nThe number of threads to be used in the simulation run. By setting this value to 1, the single-threaded runtime will be used instead of the default multi-threaded runtime.\n\n#### log_path\n\n**Day** generates three CSV files, `sources.csv`, `sinks.csv`, and `switches.csv`, containing statistics of a simulation session. `log_path` specifies the directory of the three CSV files.\n\n- **Valid value**: String\n- **Required**: No\n- **Default**: `./output`\n- **Example**:\n\n ```toml\n log_path = \"./test\"\n ```\n\n#### topology\n\n**Day** supports arbitrary topologies. Besides widely-used topologies `FatTree` and `Torus`, any topology that can be specified as an undirected graph can be supported as well.\n\n- `FatTree`\n\n To specify the `FatTree` topology, it is required to specific `k`. `k` is a multiple of 2.\n\n **Example**:\n\n ```toml\n [topology]\n category = \"FatTree\"\n\n [topology.torus]\n \tk = 8\n ```\n\n- `Torus`\n\n To specify the `Torus` topology, it is required to specific dimension `dim`, and node per dimension `n`. Only 1D, 2D, and 3D Torus topologies are supported. That is, valid values of `dim` are 1, 2, 3.\n\n **Example**:\n\n ```toml\n [topology]\n category = \"Torus\"\n\n [topology.torus]\n \tdim = 2\n \tn = 3\n ```\n\n- Custom topology\n\n Use `edges` to specify an undirected graph as the topology, and `hosts` to specify hosts in the topology.\n\n `edges` is a vector of [integer, integer]. An [integer, integer] pair presents an edge in the undirected graph.\n\n `hosts` is a vector of integers\n\n **Example**:\n\n ```toml\n edges = [[0, 1], [0, 2]]\n hosts = [0, 1, 2]\n ```\n\n### Switch\n\nIn **Day**, all switches use the same setting which can be specified with the following attributes.\n\n#### port_rate\n\nThe bit rate of each outbound port.\n\n- **Valid value**: Floating point number\n- **Required**: Yes\n- **Example**:\n\n ```toml\n port_rate = 8000\n ```\n\n#### capacity\n\nThe capacity (buffer size) of each outbound port.\n\n- **Valid value**: Integer\n- **Required**: Yes\n- **Example**:\n\n ```toml\n capacity = 100\n ```\n\n#### drop\n\nThe packet drop strategy that drops packets when the buffer is full.\n\n- **Valid value**:\n\n | Value | Meaning |\n | :--------: | ----------------------------------------- |\n | `TailDrop` | Dropping packets at the tail of the queue |\n | `RED` | Random Early Detection |\n\n- **Required**: Yes\n- **Example**:\n\n ```toml\n capacity = 100\n ```\n\n#### discipline\n\nThe scheduling discipline.\n\n- **Valid value**:\n\n | Value | Meaning | Notes |\n | :----: | ---------------------- | -------------------------------- |\n | `FIFO` | First In First Out |\n | `DRR` | Deficit Round Robin | Required to specify `weights` |\n | `WFQ` | Weighted Fair Queueing | Required to specify `weights` |\n | `SP` | Static Priority | Required to specify `priorities` |\n | `VC` | Virtual Clock | Required to specify `vticks` |\n\n- **Required**: Yes\n- **Example**:\n\n ```toml\n discipline = \"FIFO\"\n ```\n\n#### weights\n\n- **Valid value**: Vector of integers\n- **Required**: Yes if `dispcipline = \"DRR\"` or `dispcipline = \"WFQ\"`\n- **Example**:\n\n ```toml\n weights = [1, 2, 3]\n ```\n\n#### priorities\n\n- **Valid value**: Vector of (integer, integer), where the first integer is the flow class and the second integer is the priority of this flow class\n- **Required**: Yes if `dispcipline = \"SP\"`\n- **Example**:\n\n ```toml\n priorities = [(0, 2), (1, 1)]\n ```\n\n#### vticks\n\n- **Valid value**: Vector of (integer, integer), where the first integer is the flow class and the second integer is the inverse of the desired rates for the corresponding flows, in bits per second\n- **Required**: Yes if `dispcipline = \"VC\"`\n- **Example**:\n\n ```toml\n vticks = [(0, 2), (1, 1)]\n ```\n\n### Flow\n\nIn **Day**, flows can be specified one by one:\n\n```toml\n[[flow]]\nflow_id = 2\nstarts_before = [3]\nstarts_after = [1]\nflow_type = \"PacketDistribution\"\ngraph = [[0, 1]]\n[flow.traffic]\n initial_delay = 1.0\n duration = 2.0\n arr_dist = {type = \"Uniform\", low = 1, high = 1}\n pkt_size_dist = {type = \"Uniform\", low = 1000, high = 1500}\n```\n\nor by sets:\n\n```toml\n[[flow_set]]\nfirst_flow_id = 10\nflow_type = \"PacketDistribution\"\nflow_count = 10\n[flow_set.traffic]\n initial_delay = 0.0\n duration = 10.0\n arr_dist = {type = \"Uniform\", low = 0.0008, high = 0.0008} # 10Mbps\n pkt_size_dist = {type = \"Uniform\", low = 1024, high = 1024}\n```\n\nThe following table lists required, optional, or not supported attributes of a flow or a flow set.\n\n| Attribute | Meaning | flow | flow_set |\n| :-------------: | ------------------------------------------------------------------------------------- | :------: | :------: |\n| `flow_id` | The id of the flow | optional | no |\n| `first_flow_id` | The smallest flow id of the flow set | no | optional |\n| `starts_before` | The ids of flows that cannot start until this flow / flow set ends | optional | optional |\n| `starts_after` | The ids of flows that this flow / flow set must wait for them to end before it starts | optional | optional |\n| `flow_type` | The type of the flow or flows of the flow set | required | required |\n| `flow_count` | The number of flows in the flow set | no | required |\n| `graph` | The pair of the source host and the sink host of the flow | required | no |\n| `path` | The path of the flow | optional | no |\n| `traffic` | The traffic of the flow / flow set | required | required |\n\n#### flow_id\n\nThe id of the flow.\nIf not specified, the id of the first flow specified in the configuration file will be 0, and the subsequent ids of flows increase by 1.\n\n- **Valid value**: Integer\n- **Required**: No\n- **Example**:\n\n ```toml\n flow_id = 1\n ```\n\n#### first_flow_id\n\nThe smallest flow id of the flow set.\n\n- **Valid value**: Integer\n- **Required**: No\n- **Example**:\n\n ```toml\n flow_first_id = 1\n ```\n\n#### starts_before\n\nThe ids of flows that cannot start until this flow / flow set ends.\n\n- **Valid value**: Vector of integers\n- **Required**: No\n- **Example**:\n\n ```toml\n starts_before = [3, 4]\n ```\n\n#### starts_after\n\nThe ids of flows that this flow / flow set must wait for them to end before it starts.\n\n- **Valid value**: Vector of integers\n- **Required**: No\n- **Example**:\n\n ```toml\n starts_after = [0, 1]\n ```\n\n#### flow_type\n\nThe type of the flow or flows of the flow set.\n\n- **Valid value**:\n\n | Value | Meaning |\n | :------------------: | ------------------------------------------------------------------------------------------------------------ |\n | `PacketDistribution` | A flow whose packet source sends packets with specific distributions of inter-arrival times and packet sizes |\n | `TCP` | A flow whose packet source simulate the TCP protocol |\n\n- **Required**: Yes\n- **Example**:\n\n ```toml\n flow_type = \"PacketDistribution\"\n ```\n\n#### flow_count\n\nThe number of flows in the flow set.\n\n- **Valid value**: Integer\n- **Required**: Yes for a flow set\n- **Example**:\n\n ```toml\n flow_count = 10\n ```\n\n#### graph\n\nThe pair of the source host and the sink host of the flow.\n\n- **Valid value**: [[integer, integer]]\n- **Required**: Yes for a single flow\n- **Example**:\n\n ```toml\n graph = [[0, 2]]\n ```\n\n#### path\n\nThe path of the flow.\n\n- **Valid value**: Vector of integers where each integer is a node in the path\n- **Required**: No\n- **Example**:\n\n ```toml\n path = [0, 1, 2]\n ```\n\n#### traffic\n\nFor a flow, it must specify its traffic under `[flow.traffic]`.\nFor a flow set, it must specify the traffic of its flows under `[flow_set.traffic]`.\n\nThe following table lists attributes of traffic.\n\n> Note:\n>\n> - `initial_delay`, `arr_dist`, and `pkt_size_dist` are required.\n> - Either `size` or `duration` is required.\n> - If `flow_type = \"TCP\"`, `[flow.traffic.tcp]` or `[flow_set.traffic.tcp]` must be specified for the flow or flow set.\n\n- **Attributes**:\n\n | Attribute | Meaning | Valid Value |\n | :-------------: | -------------------------------------------------------------------------- | ----------------------- |\n | `initial_delay` | The seconds the flow / flow set waits before producing its first packet | Floating point number |\n | `size` | The total size of packets of the flow / each flow of the flow set in bytes | Integer |\n | `duration` | The duration of the flow / each flow of the flow set in seconds | Floating point number |\n | `arr_dist` | The arrival distribution of packets in seconds | Valid distribution info |\n | `pkt_size_dist` | The distribution of packet sizes in bytes | Valid distribution info |\n\n> Valid distribution info includes uniform distribution and exponential distribution:\n>\n> - {type = \"Uniform\", low = 0.0008, high = 0.0008}\n> - {type = \"Exp\", lambda = 1.0}\n\n- **Required**: Yes\n- **Example**:\n\n ```toml\n [[flow_set]]\n flow_type = \"TCP\"\n flow_count = 100\n [flow_set.traffic]\n \tinitial_delay = 0.0\n \tduration = 0.1\n \tarr_dist = {type = \"Uniform\", low = 0.0008, high = 0.0008}\n \tpkt_size_dist = {type = \"Uniform\", low = 1024, high = 1024}\n [flow_set.traffic.tcp]\n \tcc_algorithm = \"TCPReno\"\n ```\n\n#### traffic.tcp\n\nFor a flow, it must specify its tcp characteristics under `[flow.traffic.tcp]`.\nFor a flow set, it must specify the tcp characteristics of its flows under `[flow_set.traffic.tcp]`.\n\n- **Attributes**:\n\n | Attribute | Meaning | Valid Value |\n | :------------: | -------------------------------- | --------------------- |\n | `cc_algorithm` | The congestion control algorithm | `TCPReno`, `TCPCubic` |\n\n- **Required**: Yes\n- **Example**:\n\n ```toml\n [flow.traffic.tcp]\n \tcc_algorithm = \"TCPReno\"\n ```\n\n### Collective\n\nIn **Day**, collectives can be specified one by one:\n\n```toml\n[[collective]]\ncollective_type = \"Broadcast\"\nflow_type = \"PacketDistribution\"\nflow_count = 2\ngraph = [[0, 2], [0, 3], [1, 2], [1, 3]]\nsources = [0, 1]\nsinks = [2, 3]\n[collective.traffic]\n initial_delay = 1.0\n duration = 10.0\n arr_dist = {type = \"Uniform\", low = 1, high = 2}\n pkt_size_dist = {type = \"Uniform\", low = 1000, high = 1500}\n```\n\nor by sets:\n\n```toml\n[[collective_set]]\ncollective_type = \"Gather\"\ncollective_count = 2\nflow_type = \"PacketDistribution\"\nflow_count = 2\nsources = [[0, 1], [1, 2]]\nsinks = [[2, 2], [3, 3]]\n[collective_set.traffic]\n initial_delay = 1.0\n duration = 10.0\n arr_dist = {type = \"Uniform\", low = 3, high = 4}\n pkt_size_dist = {type = \"Uniform\", low = 2000, high = 2500}\n```\n\nThe following table lists required, optional, or not supported attributes of a collective or a collective set.\n\n| Attribute | Meaning | collective | collective_set |\n| :----------------: | --------------------------------------------------------------------------------- | :--------: | :------------: |\n| `collective_type` | The type of the collective or collective set | required | required |\n| `first_flow_id` | The smallest flow id of the collective or collective set | optional | optional |\n| `collective_count` | The number of collectives in the collective set | no | required |\n| `flow_type` | The type of the flows of the collective or collective set | required | required |\n| `flow_count` | The number of flows in the collective or in each collective of the collective set | required | required |\n| `graph` | The pairs of the source host and the sink host of the collective's flows | optional | no |\n| `paths` | The paths of the collective's flows | optional | no |\n| `sources` | The sources of flows | optional | optional |\n| `sinks` | The sinks of flows | optional | optional |\n| `traffic` | The traffic of the collective / collective set | required | required |\n\n#### collective_type\n\nThe type of the collective or collective set.\n\n- **Valid value**: `Brordcast` or `Gather`\n- **Required**: Yes\n- **Example**:\n\n ```toml\n collective_type = \"Broadcast\"\n ```\n\n#### first_flow_id\n\nThe smallest flow id of the collective / collective set.\n\n- **Valid value**: Integer\n- **Required**: No\n- **Example**:\n\n ```toml\n flow_first_id = 1\n ```\n\n#### collective_count\n\nThe number of collectives in the collective set.\n\n- **Valid value**: Integer\n- **Required**: Yes for a collective set\n- **Example**:\n\n ```toml\n collective_count = 10\n ```\n\n#### flow_count\n\nThe number of flows in the collective or in each collective of the collective set.\n\n- **Valid value**: Integer\n- **Required**: Yes\n- **Example**:\n\n ```toml\n flow_count = 4\n ```\n\n#### graph\n\nThe pairs of the source hosts and the sink hosts of the collective's flows.\n\n- **Valid value**: Vector of [integer, integer]\n- **Required**: No\n- **Example**:\n\n ```toml\n graph = [[0, 1], [0, 2]]\n ```\n\n#### paths\n\nThe paths of the collective's flows.\n\n- **Valid value**: Vector of vectors of integers where each integer is a node in the path\n- **Required**: No\n- **Example**:\n\n ```toml\n paths = [[0, 1], [0, 1, 2]]\n ```\n\n#### sources\n\nFor a collective, `sources` is the set of the source hosts of this collective's flows.\n\n- **Valid value**: Vector of integers where each integer is a source host\n- **Required**: No\n- **Example**:\n\n ```toml\n sources = [0, 1]\n ```\n\nFor a collective set, `sources` is set of the source hosts of this collective set's collectives' flows.\n\n- **Valid value**: Vector of vectors of integers where each vector is a collective's flows' source hosts\n- **Required**: No\n- **Example**:\n\n ```toml\n sources = [[0, 0], [1, 1]]\n ```\n\n#### sinks\n\nFor a collective, `sinks` is the set of the sink hosts of this collective's flows.\n\n- **Valid value**: Vector of integers where each integer is a sink host\n- **Required**: No\n- **Example**:\n\n ```toml\n sinks = [0, 1]\n ```\n\nFor a collective set, `sinks` is set of the sink hosts of this collective set's collectives' flows.\n\n- **Valid value**: Vector of vectors of integers where each vector is a collective's flows' sink hosts\n- **Required**: No\n- **Example**:\n\n ```toml\n sinks = [[0, 0], [1, 1]]\n ```\n\n#### traffic\n\nFor a collective, it must specify the traffic of its flows under `[collective.traffic]`.\nFor a collective set, it must specify the traffic of its flows under `[collective_set.traffic]`.\n\nThe following table lists attributes of traffic.\n\n> Note:\n>\n> - `initial_delay`, `arr_dist`, and `pkt_size_dist` are required.\n> - Either `size` or `duration` is required.\n> - If `flow_type = \"TCP\"`, `[flow.traffic.tcp]` or `[flow_set.traffic.tcp]` must be specified for the flow or flow set.\n\n- **Attributes**:\n\n | Attribute | Meaning | Valid Value |\n | :-------------: | ----------------------------------------------------------------------------------- | ----------------------- |\n | `initial_delay` | The seconds the collective / collective set waits before producing its first packet | Floating point number |\n | `size` | The total size of packets of each flow of the collective / collective set in bytes | Integer |\n | `duration` | The duration of each flow of the collective / collective set in seconds | Floating point number |\n | `arr_dist` | The arrival distribution of packets in seconds | Valid distribution info |\n | `pkt_size_dist` | The distribution of packet sizes in bytes | Valid distribution info |\n\n> Valid distribution info includes uniform distribution and exponential distribution:\n>\n> - {type = \"Uniform\", low = 0.0008, high = 0.0008}\n> - {type = \"Exp\", lambda = 1.0}\n\n- **Required**: Yes\n- **Example**:\n\n ```toml\n [[collective]]\n collective_type = \"Broadcast\"\n flow_type = \"PacketDistribution\"\n flow_count = 4\n [collective.traffic]\n initial_delay = 1.0\n duration = 10.0\n arr_dist = {type = \"Uniform\", low = 3, high = 4}\n pkt_size_dist = {type = \"Uniform\", low = 2000, high = 2500}\n ```\n\n#### traffic.tcp\n\nFor a collective, it must specify the tcp characteristicsc of its flows under `[collective.traffic.tcp]`.\nFor a collective set, it must specify the tcp characteristics of its collectives' flows under `[collective_set.traffic.tcp]`.\n\n- **Attributes**:\n\n | Attribute | Meaning | Valid Value |\n | :------------: | -------------------------------- | --------------------- |\n | `cc_algorithm` | The congestion control algorithm | `TCPReno`, 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