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:
100Mi
- 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 50Mi
of memory (half of the base amount), and the container
runs 120sec, then the reported Resource Duration will be 60sec * (100Mi 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
, a memory limit of 1Gi
and an nvidia.com/gpu
resource limit of 1
:
CPU: 3min * 2000m / 1000m = 6min * (1 cpu)
Memory: 3min * 1Gi / 100Mi = 30min * (100Mi memory)
GPU: 3min * 1 / 1 = 3min * (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 100Mi
of memory." If a container only
uses 10Mi
, each second it runs will only count as a tenth-second of memory
.
Rounding Down¶
For a short running pods (<10s), if the memory request is also small (for example, 10Mi
), then the memory value may be 0s. This is because the denominator is 100Mi
.