In Jenkins when clicking on Build Executor Status I can only see free disk space related statistics (URI: /computer). How I can monitor free system memory (RAM) in Jenkins?
I'm asking, because sometimes when I had too many executors (despite having swap space configured, but not the one below), Jenkins was freezing or crashing a lot.
Have a look at the Monitoring plugin. Here are some more details about it (from the linked page):
- Charts of memory, cpu, system load average, http response times by day, week, month, year or custom period
- Statistics of http requests with mean response times, mean cpu times, mean response size by request and by day, week, month, year or custom period
- Errors and logs
- Current http requests
- Threads
- Heap histogram (instances and sizes by class)
- Http sessions
- Process list of OS
- MBeans
- Actions for GC, heap dump and invalidate session(s)
- Report in html or pdf
- In English, German, French, Portuguese or Chinese
- Jenkins security
- For Jenkins nodes (slaves in general):
- The report for the nodes is available at
http://yourhost/monitoring/nodes- Charts aggregated for all nodes of memory, cpu, system load average, number of running builds, build queue length, build times by period
- Detailed statistics of the build times and of the build steps by period
- Threads, process list and MBeans for each nodes
- Heap histogram aggregated for all nodes
- For each individual node (each node in
http://yourhost/computer), reports and actions are available from the "Monitoring" page in the contextual menu or in the detail of the node:
- Threads, process list, MBeans of that node only
- Heap histogram of that node
- Actions for GC, heap dump
- And more...
Credits: Assaf Lavie (who first mentioned it in a comment, but for some reason didn't post that as an actual answer ...).
As for workaround, the actual memory can be checked by invoking Groovy commands directly in Script Console (at /computer/(master)/script). Example command:
println "free -m".execute().text
