Status: Resolved (View Workflow)
Run Jenkins with --accessLoggerClassName=winstone.accesslog.SimpleAccessLogger --simpleAccessLogger.file=/tmp/access.log and then tail -n +0 -f /tmp/access.log | fgrep 304 to see every case when a resource is served which could have been cached. In stock Jenkins you will see /plugin/translation/flags.png on every page, and if you run with a lot of plugins this count goes up; e.g. for Jenkins Enterprise by CloudBees a job page can also load /plugin/nectar-rbac/images/24x24/groups.png, /plugin/nectar-rbac/images/24x24/roles.png, /plugin/cloudbees-folder/images/24x24/move.png, /plugin/skip-plugin/images/24x24/skip-off.png, and /plugin/cloudbees-secure-copy/images/24x24/exports.png, and also /plugin/nectar-vmware/24x24/vmware.gif at top level.
All these HTTP requests add load to the handling thread (especially when all the various security and logging filters are processed), and may add some I/O load depending on the container. The overhead is increased considerably if auto refresh is enabled. All that work is wasted since these icons can be safely cached by the browser.
task.jelly tries to prepend Jenkins.RESOURCE_PATH to images, which works for built-in actions but fails for actions provided by plugins (assuming they define their own icons). The flags.png problem was fixed in translation-1.9.hpi, but Jenkins still bundles 1.8.
- is duplicated by
JENKINS-16572 Optimize http requests for static resources in the disk usage plugin
Integrated in jenkins_main_trunk #2227
[FIXED JENKINS-16530] Improve icon caching. (Revision a9c0080ebdb5ce99cfa47cef674dc59a4035e779)
Result = SUCCESS
Jesse Glick : a9c0080ebdb5ce99cfa47cef674dc59a4035e779
Code changed in jenkins
User: Christopher Orr
[FIXED JENKINS-16075] Remove redundant resource path from icon URL.
Apparently the fix for
JENKINS-16530 now includes this automatically
for all plugin images, regardless of whether the plugin was already
doing the right thing and allowing caching.
Code changed in jenkins
User: Jesse Glick
[FIXED JENKINS-16530] Improve icon caching.
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