Please note: the question is based on the old, now called "scripted" pipeline format. When using "declarative pipelines", parallel blocks can be nested inside of stage blocks (see Parallel stages with Declarative Pipeline 1.2).
I'm wondering how parallel steps are supposed to work with Jenkins workflow/pipeline plugin, esp. how to mix them with build stages. I know about the general pattern:
parallel(firstTask: { // Do some stuff }, secondTask: { // Do some other stuff in parallel })
However, I'd like to run couple of stages in parallel (on the same node, which has multiple executors), so I tried to add stages like this:
stage 'A' // Do some preparation stuff parallel(firstTask: { stage 'B1' // Do some stuff }, secondTask: { stage 'B2' // Do some other stuff in parallel }) stage 'C' // Finalizing stuff
This does not work as expected. The "do stuff" tasks are executed in parallel, but the parallel stages end immediately and do not incorporate the stuff they should contain. As a consequence, the Stage View does not show the correct result and also does not link the logs.
Can I build different stages in parallel, or is the "parallel" step only meant to be used within a single stage?
Jenkins is a great CI tool when it comes to flexibility. Every simple thing can be done in ten different ways, including parallelizing a build.
This plugin adds a tool that lets you easily execute tests in parallel. This is achieved by having Jenkins look at the test execution time of the last run, split tests into multiple units of roughly equal size, then execute them in parallel.
You will need to configure your "child" job so that it can run in parallel by checking the "Execute concurrent builds if necessary" in the job configuration. Whatever set of slaves provide the connection to the embedded devices will need enough executors to run your jobs in parallel.
You may not place the deprecated non-block-scoped stage
(as in the original question) inside parallel
.
As of JENKINS-26107, stage
takes a block argument. You may put parallel
inside stage
or stage
inside parallel
or stage
inside stage
etc. However visualizations of the build are not guaranteed to support all nestings; in particular
stage
nesting.parallel
branches inside a top-level stage, but currently no more.JENKINS-27394, if implemented, would display arbitrarily nested stage
s.
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