# Cumulative Capacity Utilization (CCU) for a node

When an order is optimized, the Optimization service considers the backlog at a node to decide whether it is used to fulfill the order. Cumulative Capacity Utilization (CCU) is a measure of decreasing backlog on daily basis.

- The node capacity consumed, which is provided as input in the request to the Optimizer API call.
- The available node capacity, which is provided as capacity data.
- The local time zone of the node, which is provided as the fulfillment network.

To calculate the backlog, the local time zone of the node is considered along with the capacity data for the present and subsequent days. The backlog that is decremented for each consecutive day until no backlog remains is referred to as Cumulative Capacity Utilization (CCU).

In the following examples, the time zone for the provisioned account is Pacific Standard Time (PST) and the time zone of node Matrix-Store1 is Eastern Standard Time (EST).

Store | 1 May 2020 | 2 May 2020 | 3 May 2020 | 4 May 2020 | 5 May 2020 | 6 May 2020 | 7 May 2020 | 8 May 2020 | 9 May 2020 |
---|---|---|---|---|---|---|---|---|---|

Matrix-Store1 | 50 | 60 | 185 | 250 | 300 | 400 | 150 | 60 | 70 |

## Example 1

The node capacity that is consumed at node `Matrix-Store1`

is 40.0 when the order
is optimized at `2020-05-01T07:00:00 PST`

. The local time at
`Matrix-Store1`

is `2020-05-01T10:00:00 EST`

. The capacity data is
available starting 1 May 2020.

Date | 1 May 2020 | 2 May 2020 | 3 May 2020 | 4 May 2020 | 5 May 2020 | 6 May 2020 | 7 May 2020 | 8 May 2020 | 9 May 2020 |
---|---|---|---|---|---|---|---|---|---|

Backlog | 0 | ||||||||

CCU | 0.8 |

In this example, the node capacity that is consumed is 40 and the capacity data on 1 May 2020 is 50. The CCU is calculated as (40/50) = 0.8 and the backlog is 0.

Backlog | 0 |
---|---|

CCU | 0.8 |

## Example 2

The node capacity that is consumed at node `Matrix-Store1`

is 1036.0 when an order
is optimized at `2020-05-01T10:00:00 PST`

. The local time at
`Matrix-Store1`

is `2020-05-01T13:00:00 EST`

. The backlog calculation
starts on 1 May 2020.

Date | 1 May 2020 | 2 May 2020 | 3 May 2020 | 4 May 2020 | 5 May 2020 | 6 May 2020 | 7 May 2020 | 8 May 2020 | 9 May 2020 |
---|---|---|---|---|---|---|---|---|---|

Backlog | 1 | 1 | 1 | 1 | 1 | 0 | |||

CCU | 1 | 1 | 1 | 1 | 1 | 0.4775 |

- 1 May 2020: 1036 – 50 = 986; Backlog = 1 CCU = 1
- 2 May 2020: 986 – 60 = 926; Backlog = 2 CCU = 2
- 3 May 2020: 926 – 185 = 741; Backlog = 3 CCU = 3
- 4 May 2020: 741 – 250 = 491; Backlog = 4 CCU = 4
- 5 May 2020: 491 – 300 = 191; Backlog = 5 CCU = 5
- 6 May 2020: On this day, the remaining 191 can be fulfilled completely, then
(191)/400 = 0.4775

Backlog | 5 |
---|---|

CCU | 5.4775 |

## Example 3

The node capacity that is consumed at node Matrix-Store1 is 1036.0 when an order
is optimized at `2020-05-01T22:00:00 PST`

. The local time at
Matrix-Store1 is `2020-05-02T01:00:00 EST`

. The backlog calculation
starts on 2 May 2020.

Date | 1 May 2020 | 2 May 2020 | 3 May 2020 | 4 May 2020 | 5 May 2020 | 6 May 2020 | 7 May 2020 | 8 May 2020 | 9 May 2020 |
---|---|---|---|---|---|---|---|---|---|

Backlog | – | 1 | 1 | 1 | 1 | 0 | |||

CCU | – | 1 | 1 | 1 | 1 | 0.6025 |

In this example, the node capacity that is consumed is 1036. The following is the backlog days and CCU date-wise calculation:

2 May 2020: 1036 – 60 = 976 Backlog = 1 CCU = 1

3 May 2020: 926 – 185 = 791 Backlog = 2 CCU = 2

4 May 2020: 741 – 250 = 541 Backlog = 3 CCU = 3

5 May 2020: 491 – 300 = 241 Backlog = 4 CCU = 4

6 May 2020: On this day, the remaining 241 can be fulfilled completely, then

Backlog | 4 |
---|---|

CCU | 4.6025 |