When sending a stash across the network, the data transfer can be significantly slower than the underlying network. This seems to be due to some slow on-the-fly compression happening during the transfer. Using the following script, the Unstash phase takes 1-2 seconds for 10MB of /dev/zero, and 49 seconds for 10MB of /dev/urandom. The Stash phase consistently takes 1-2 seconds. This makes me think there's a compression step, since /dev/zero should compress much faster than /dev/urandom.
node {
deleteDir()
stage "Stash"
sh "dd if=/dev/zero of=data bs=1M count=10"
stash name: 'build_outputs', includes: 'data'
sh "date"
node('lab') {
deleteDir()
stage "Unstash"
unstash 'build_outputs'
sh "ls -al"
}
}
I'm not calling this a dupe of that because the original text refers to stash only, and this bug seems isolated to unstash. Also this is on x86, not ARM.
SCM/JIRA link daemon
added a comment - Code changed in jenkins
User: Jesse Glick
Path:
src/main/resources/org/jenkinsci/plugins/workflow/support/steps/stash/StashStep/help.html
http://jenkins-ci.org/commit/workflow-basic-steps-plugin/413df48bdcb832261e8fb110150eeb8069e77c33
Log:
JENKINS-38640 JENKINS-36914 Warn users to avoid stash/unstash of large files
Thanks for the workaround. It won't help in my application, as the master can only initiate connections to the slaves via ssh, and no connections can be initiated in the other direction. A shared filesystem via NFS or similar isn't really practical, unfortunately. Stash does what I want, and I'm willing to take some performance hit, but it should be able to do much better than 200KB/s on this hardware. Looking forward to trying out the greedy change to see how that does.
John Koleszar
added a comment - Thanks for the workaround. It won't help in my application, as the master can only initiate connections to the slaves via ssh, and no connections can be initiated in the other direction. A shared filesystem via NFS or similar isn't really practical, unfortunately. Stash does what I want, and I'm willing to take some performance hit, but it should be able to do much better than 200KB/s on this hardware. Looking forward to trying out the greedy change to see how that does.
The External Workspace Manager plugin seems to require sharing drives between master and slaves, which rules it out in a lot of situations.
If, instead of stashing, the official recommendation is to use an external repository manager such as Nexus or Artifactory, it would be good to have some pipeline examples. For instance, how to stash the majority of workspace files, whilst letting the repository manager handle the larger files, and still ensuring that the right files are used together throughout the pipeline.
Sean Flanigan
added a comment - The External Workspace Manager plugin seems to require sharing drives between master and slaves, which rules it out in a lot of situations.
If, instead of stashing, the official recommendation is to use an external repository manager such as Nexus or Artifactory, it would be good to have some pipeline examples. For instance, how to stash the majority of workspace files, whilst letting the repository manager handle the larger files, and still ensuring that the right files are used together throughout the pipeline.
The admonition not to use stash is too strong, in my opinion. I can see plenty of situations where having a repository manager or setting up shared storage are completely unnecessary complexity. The latest release of this plugin performs as I'd expect.
John Koleszar
added a comment - The admonition not to use stash is too strong, in my opinion. I can see plenty of situations where having a repository manager or setting up shared storage are completely unnecessary complexity. The latest release of this plugin performs as I'd expect.
Maybe there's an upper limit where it falls over, but I haven't hit it yet. In my opinion, if there were one, it'd be a bug worth fixing, rather than something to document away as WAI.
John Koleszar
added a comment - Thanks, Oleg. This is the documentation I was referring to about stash only being suitable for small files:
https://github.com/jenkinsci/workflow-basic-steps-plugin/commit/413df48bdcb832261e8fb110150eeb8069e77c33
Maybe there's an upper limit where it falls over, but I haven't hit it yet. In my opinion, if there were one, it'd be a bug worth fixing, rather than something to document away as WAI.
This ticket is quite old but in the past lots of changes have happened and I wonder what the current network usage with stashing is. Did the Jenkins guys improve stashing?
My background is that the CI builds various C++ testsuites and I would like to split up building and testing. That's where stashing would be useful if the performance of copying the involved files would be acceptable. In the past this has been really bad - with or without compression enabled.
Any current experiences?
I'm talking about folders to be copied with e.g. 500MB.
Heiko Nardmann
added a comment - This ticket is quite old but in the past lots of changes have happened and I wonder what the current network usage with stashing is. Did the Jenkins guys improve stashing?
My background is that the CI builds various C++ testsuites and I would like to split up building and testing. That's where stashing would be useful if the performance of copying the involved files would be acceptable. In the past this has been really bad - with or without compression enabled.
Any current experiences?
I'm talking about folders to be copied with e.g. 500MB.
heiko_nardmann, I've been wondering the same thing - the following warning is still present in /pipeline-syntax:
Note that the stash and unstash steps are designed for use with small files. For large data transfers, use the External Workspace Manager plugin, or use an external repository manager such as Nexus or Artifactory. This is because stashed files are archived in a compressed TAR, and with large files this demands considerable resources on the controller, particularly CPU time. There's not a hard stash size limit, but between 5-100 MB you should probably consider alternatives. If you use the Artifact Manager on S3 plugin, or another plugin with a remote atifact manager, you can use this step without affecting controller performance since stashes will be sent directly to S3 from the agent (and similarly for unstash).
I ran the following two pipelines as a test while watching memory and CPU consumption to compare stash/unstash vs archiveArtifacts/curl with a 2GB file:
For both pipelines the first stage takes 2 minutes on my installation - the dd part is very fast so it is dominated by the stash/archiveArtifacts step. For the second stage the unstash takes about 55 seconds where curl takes about 8 seconds.
I informally watched the CPU and memory usage on the main server and the build agent and did not notice any significant difference in memory usage. CPU usage on the main server was also about the same in both cases. The CPU usage on the jenkins agent was much higher with stash than with archiveArtifacts. In summary:
stash and archiveArtifacts take about the same wall-clock time - resource consumption-wise the jenkins agent uses more CPU with stash
unstash takes about 55 seconds vs 8 for curl
tsondergaard
added a comment - heiko_nardmann , I've been wondering the same thing - the following warning is still present in /pipeline-syntax:
Note that the stash and unstash steps are designed for use with small files. For large data transfers, use the External Workspace Manager plugin, or use an external repository manager such as Nexus or Artifactory. This is because stashed files are archived in a compressed TAR, and with large files this demands considerable resources on the controller, particularly CPU time. There's not a hard stash size limit, but between 5-100 MB you should probably consider alternatives. If you use the Artifact Manager on S3 plugin, or another plugin with a remote atifact manager, you can use this step without affecting controller performance since stashes will be sent directly to S3 from the agent (and similarly for unstash ).
I ran the following two pipelines as a test while watching memory and CPU consumption to compare stash/unstash vs archiveArtifacts/curl with a 2GB file:
stash/unstash:
pipeline {
agent { label "linux" }
stages {
stage( 'Create and Stash File' ) {
steps {
script {
sh 'dd if =/dev/urandom of=randomfile bs=1M count=2048'
stash includes: 'randomfile' , name: 'randomFileStash'
}
}
}
stage( 'Unstash' ) {
steps {
script {
unstash 'randomFileStash'
sh 'ls -lh randomfile'
}
}
}
}
}
archiveArtifacts/curl:
pipeline {
agent { label "linux" }
stages {
stage( 'Create and Archive File' ) {
steps {
script {
sh 'dd if =/dev/urandom of=randomfile bs=1M count=2048'
archiveArtifacts artifacts: 'randomfile' , onlyIfSuccessful: true
}
}
}
stage( 'Retrieve' ) {
steps {
script {
sh "curl -O ${env.JENKINS_URL}/job/${env.JOB_NAME}/${env.BUILD_NUMBER}/artifact/randomfile"
sh 'ls -lh randomfile'
}
}
}
}
}
For both pipelines the first stage takes 2 minutes on my installation - the dd part is very fast so it is dominated by the stash/archiveArtifacts step. For the second stage the unstash takes about 55 seconds where curl takes about 8 seconds.
I informally watched the CPU and memory usage on the main server and the build agent and did not notice any significant difference in memory usage. CPU usage on the main server was also about the same in both cases. The CPU usage on the jenkins agent was much higher with stash than with archiveArtifacts. In summary:
stash and archiveArtifacts take about the same wall-clock time - resource consumption-wise the jenkins agent uses more CPU with stash
unstash takes about 55 seconds vs 8 for curl
Andres Rodriguez
John Koleszar
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From here issues are either marked assigned or resolved.","iconUrl":"/images/icons/statuses/reopened.png","statusCategory":{"id":4,"key":"indeterminate","colorName":"inprogress"}}\">Reopened</option>\n <option class=\"imagebacked\" data-icon=\"/images/icons/statuses/information.png\" value=\"10005\" title=\"In Review\" data-simple-status=\"{"id":"10005","name":"In Review","description":"","iconUrl":"/images/icons/statuses/information.png","statusCategory":{"id":4,"key":"indeterminate","colorName":"inprogress"}}\">In Review</option>\n <option class=\"imagebacked\" data-icon=\"/images/icons/statuses/resolved.png\" value=\"10002\" title=\"Fix Prepared\" data-simple-status=\"{"id":"10002","name":"Fix Prepared","description":"A fix is implemented and is waiting for the next security release","iconUrl":"/images/icons/statuses/resolved.png","statusCategory":{"id":4,"key":"indeterminate","colorName":"inprogress"}}\">Fix Prepared</option>\n <option class=\"imagebacked\" data-icon=\"/images/icons/statuses/generic.png\" value=\"10000\" title=\"Verified\" data-simple-status=\"{"id":"10000","name":"Verified","description":"Verified","iconUrl":"/images/icons/statuses/generic.png","statusCategory":{"id":4,"key":"indeterminate","colorName":"inprogress"}}\">Verified</option>\n <option class=\"imagebacked\" data-icon=\"/images/icons/statuses/generic.png\" value=\"10203\" title=\"Fixed but Unreleased\" data-simple-status=\"{"id":"10203","name":"Fixed but Unreleased","description":"This change has been implemented and merged, but not yet released.","iconUrl":"/images/icons/statuses/generic.png","statusCategory":{"id":3,"key":"done","colorName":"success"}}\">Fixed but Unreleased</option>\n <option class=\"imagebacked\" data-icon=\"/images/icons/statuses/resolved.png\" value=\"5\" title=\"Resolved\" data-simple-status=\"{"id":"5","name":"Resolved","description":"A developer had implemented a fix and is waiting for a feedback from the reporter.","iconUrl":"/images/icons/statuses/resolved.png","statusCategory":{"id":3,"key":"done","colorName":"success"}}\">Resolved</option>\n <option class=\"imagebacked\" data-icon=\"/images/icons/statuses/closed.png\" value=\"6\" title=\"Closed\" data-simple-status=\"{"id":"6","name":"Closed","description":"The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.","iconUrl":"/images/icons/statuses/closed.png","statusCategory":{"id":3,"key":"done","colorName":"success"}}\">Closed</option>\n <option class=\"imagebacked\" data-icon=\"/images/icons/statuses/open.png\" value=\"10003\" title=\"To Do\" data-simple-status=\"{"id":"10003","name":"To Do","description":"","iconUrl":"/images/icons/statuses/open.png","statusCategory":{"id":2,"key":"new","colorName":"default"}}\">To Do</option>\n <option class=\"imagebacked\" data-icon=\"/images/icons/statuses/closed.png\" value=\"10004\" title=\"Done\" data-simple-status=\"{"id":"10004","name":"Done","description":"","iconUrl":"/images/icons/statuses/closed.png","statusCategory":{"id":3,"key":"done","colorName":"success"}}\">Done</option>\n </optgroup>\n</select>\n </div>\n \n","validSearcher":true,"isShown":true},"labels":{"name":"Label","viewHtml":" <div class=\"searcherValue\">\n \n <label class=\"fieldLabel\" for=\"fieldlabels\">Label:</label><span id=\"fieldlabels\" class=\"fieldValue\">\n \n gzip\n</span></div>\n","editHtml":"\n <div class=\"field-group aui-field-labels\" >\n <label for=\"searcher-labels\">Labels</label> <select class=\"js-label-checkboxmultiselect\" multiple=\"multiple\" id=\"searcher-labels\" name=\"labels\" data-placeholder-text=\"Find Labels...\">\n <option value=\"gzip\" title=\"gzip\" selected=\"selected\">gzip</option>\n </select>\n </div>\n \n","jql":"labels = gzip","validSearcher":true,"isShown":true}}}
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Code changed in jenkins
User: Jesse Glick
Path:
src/main/resources/org/jenkinsci/plugins/workflow/support/steps/stash/StashStep/help.html
http://jenkins-ci.org/commit/workflow-basic-steps-plugin/413df48bdcb832261e8fb110150eeb8069e77c33
Log:
JENKINS-38640JENKINS-36914Warn users to avoid stash/unstash of large files