Resource Duration¶

v2.7 and after

Argo Workflows provides an indication of how much resource your workflow has used and saves this information. This is intended to be an indicative but not accurate value.

Calculation¶

The calculation is always an estimate, and is calculated by duration.go based on container duration, specified pod resource requests, limits, or (for memory and CPU) defaults.

Each indicator is divided by a common denominator depending on resource type.

Base Amounts¶

Each resource type has a denominator used to make large values smaller.

CPU: 1
Memory: 1Gi
Storage: 10Gi
Ephemeral Storage: 10Gi
All others: 1

The requested fraction of the base amount will be multiplied by the container's run time to get the container's Resource Duration.

For example, if you've requested 100Mi of memory (one tenth of the base amount), and the container runs 120sec, then the reported Resource Duration will be 12sec * (1Gi memory).

Request Defaults¶

If requests are not set for a container, Kubernetes defaults to limits. If limits are not set, Argo falls back to 100m for CPU and 100Mi for memory.

Note: these are Argo's defaults, not Kubernetes' defaults. For the most meaningful results, set requests and/or limits for all containers.

Example¶

A pod that runs for 3min, with a CPU limit of 2000m, no memory request and an nvidia.com/gpu resource limit of 1:

CPU:    3min * 2000m / 1000m = 6min * (1 cpu)
Memory: 3min * 100Mi / 1Gi   = 18sec * (100Mi memory)
GPU:    3min * 1     / 1     = 2min * (1 nvidia.com/gpu)

Web/CLI reporting¶

Both the web and CLI give abbreviated usage, like 9m10s*cpu,6s*memory,2m31s*nvidia.com/gpu. In this context, resources like memory refer to the "base amounts".

For example, memory means "amount of time a resource requested 1Gi of memory." If a container only uses 100Mi, each second it runs will only count as a tenth-second of memory.

Rounding Down¶

For short running pods (<10s), the memory value may be 0s. This is because the default is 100Mi, but the denominator is 1Gi.