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Bug
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Resolution: Fixed
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Blocker
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None
Hi,
Since several days I have at least once Jenkins UI that doesn't reply. Background jobs are ok but we have a white screen or nothing from the web UI. We have many (maven) jobs and a lot of plugins. Master have several executors. I can give you many more details if required.
I created a thread dump : https://gist.github.com/aheritier/8593910
You can see "Handling GET" threads blocked with something like :
java.lang.Thread.State: BLOCKED (on object monitor) at hudson.maven.MavenModuleSetBuild.getResult(MavenModuleSetBuild.java:211) - waiting to lock <0x00000006ef034588> (a java.lang.Object) at hudson.plugins.projectstats.NumBuildsStats.compute(NumBuildsStats.java:52) at hudson.plugins.projectstats.column.NumBuildsColumn.getStats(NumBuildsColumn.java:53)
In my screens I'm using the dashboard plugin with various statistics from our builds and it seems that it has some difficulties to compute them.
I'm using the LTS 1.532.1 and I just deployed the 1.532.2 RC but it doesn't help. I didn't notice this problem just after a plugin update thus I don't have a real clue about what to do.
- is related to
-
-
- Resolved
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[JENKINS-21487] Frozen UI
I may increase a little bit the server heap and reduce the memory of executors or their numbers but I'm afraid to only move the problem for later.
Consider separating Jenkins master from any executors actually running builds. If you don't have the machines, run a separate Jenkins slave process on the master so they run in different VMs. I expect this to make investigating issues easier.
Regarding the heap, remember that build records are soft references, so it could go from a situation where two threads trigger GC of each others' data to peaceful coexistence. Or not. Still, worth a try.
FWIW if you don't need fingerprints, don't use them. (You can move the fingerprints folder out of Jenkins home and restart Jenkins to try – note that you'll lose either these old or any newer fingerprints as they don't merge easily)
Stats about the # of builds
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15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 33, 34, 34, 34, 34, 34, 34, 34, 34, 34, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 35, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 38, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 52, 52, 52, 52, 52, 52, 52, 52, 52, 52, 52, 52, 52, 52, 52, 52, 52, 52, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 55, 55, 55, 55, 55, 55, 55, 56, 56, 56, 56, 56, 56, 56, 57, 57, 57, 57, 57, 57, 58, 58, 58, 59, 60, 61, 61, 61, 64]
I'm surprised to find jobs with more than 15 results. I will investigate
I may stop local executors and use my additionnal agent to help to diagnose but I thought that local jobs where now running in their own VM ?
I have also in my todo one day to use a server with ssd drives for the jenkins master and only remote agents to not have such issue with the UI
I tried to have a look why I had so much by executing
for(item in Jenkins.instance.getAllItems(Job.class)){ if(item.builds.size() > 15){ println item.name println item.class println item.builds.size() } }
and it gives
org.exoplatform.calendar:calendar class hudson.maven.MavenModule 26 org.exoplatform.calendar:calendar-common class hudson.maven.MavenModule 29 org.exoplatform.calendar:calendar-component-create class hudson.maven.MavenModule 28 org.exoplatform.calendar:calendar-extension class hudson.maven.MavenModule 31 ...
These are maven sub modules. I don't understand why they aren't purged and perhaps the UI tries to load them while they are really useless. Only results at projects level are useful.
I upgraded to 1.532.2 and did some cleanup on our instance and the problem doesn't occur anymore
magnayn
added a comment - So, I'm re-opening this as I can re-create the "white screen of death" regularly on our Jenkins instance, on the latest LTS (1.565.1).
I think this is strongly influenced by slow(ish) disk (we are ZFS on Linux), because it's often sitting relatively low levels of CPU. We have a reasonable number of jobs, but nothing to write home about.
Running the groovy script from above seems to show it spending extreme amounts of time in what looks like parsing XML files. To get the size, it's triggering the following bit of trace:
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:234)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
- locked <0x00000000f9b461f0> (a java.io.BufferedInputStream)
at java.io.FilterInputStream.read(FilterInputStream.java:83)
at java.io.PushbackInputStream.read(PushbackInputStream.java:139)
at com.thoughtworks.xstream.core.util.XmlHeaderAwareReader.getHeader(XmlHeaderAwareReader.java:79)
at com.thoughtworks.xstream.core.util.XmlHeaderAwareReader.<init>(XmlHeaderAwareReader.java:61)
at com.thoughtworks.xstream.io.xml.AbstractXppDriver.createReader(AbstractXppDriver.java:65)
at hudson.XmlFile.unmarshal(XmlFile.java:163)
at hudson.model.Run.reload(Run.java:321)
at hudson.model.Run.<init>(Run.java:309)
at hudson.model.AbstractBuild.<init>(AbstractBuild.java:173)
at hudson.maven.AbstractMavenBuild.<init>(AbstractMavenBuild.java:54)
at hudson.maven.MavenModuleSetBuild.<init>(MavenModuleSetBuild.java:146)
at sun.reflect.GeneratedConstructorAccessor58.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at jenkins.model.lazy.LazyBuildMixIn.loadBuild(LazyBuildMixIn.java:153)
at jenkins.model.lazy.LazyBuildMixIn$1.create(LazyBuildMixIn.java:134)
at hudson.model.RunMap.retrieve(RunMap.java:218)
at hudson.model.RunMap.retrieve(RunMap.java:56)
at jenkins.model.lazy.AbstractLazyLoadRunMap.load(AbstractLazyLoadRunMap.java:687) - locked <0x0000000082951908> (a hudson.model.RunMap)
at jenkins.model.lazy.AbstractLazyLoadRunMap.load(AbstractLazyLoadRunMap.java:670)
at jenkins.model.lazy.AbstractLazyLoadRunMap.getById(AbstractLazyLoadRunMap.java:542)
at jenkins.model.lazy.BuildReferenceMapAdapter.unwrap(BuildReferenceMapAdapter.java:42)
at jenkins.model.lazy.BuildReferenceMapAdapter.access$200(BuildReferenceMapAdapter.java:27)
at jenkins.model.lazy.BuildReferenceMapAdapter$SetAdapter._unwrap(BuildReferenceMapAdapter.java:356)
at jenkins.model.lazy.BuildReferenceMapAdapter$SetAdapter.access$400(BuildReferenceMapAdapter.java:248)
at jenkins.model.lazy.BuildReferenceMapAdapter$SetAdapter$1.adapt(BuildReferenceMapAdapter.java:271)
at jenkins.model.lazy.BuildReferenceMapAdapter$SetAdapter$1.adapt(BuildReferenceMapAdapter.java:269)
at hudson.util.AdaptedIterator.next(AdaptedIterator.java:54)
at com.google.common.collect.Iterators$7.computeNext(Iterators.java:648)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
at java.util.Collections$UnmodifiableCollection$1.hasNext(Collections.java:1101)
at java.util.AbstractMap$2$1.hasNext(AbstractMap.java:392)
at hudson.util.RunList.size(RunList.java:108)
That seems really, really expensive to perform when all the caller cares about is the size of the runlist. Regardless of anything else, that looks like an easy optimisation.
Similarly, the home page lockups seem to be because it spends a long time figuring out "what was the last successful / last failed" build, which looks to be similar in nature. I wonder if that could be cached to speed it up without having to load the entire dataset.
It's possible that it's memory pressure causing the system to dump this stuff and it having to reload. I'm going to try increasing Xmx and maybe getting some dumps to figure out what's happening.
magnayn
added a comment - So, I'm re-opening this as I can re-create the "white screen of death" regularly on our Jenkins instance, on the latest LTS (1.565.1).
I think this is strongly influenced by slow(ish) disk (we are ZFS on Linux), because it's often sitting relatively low levels of CPU. We have a reasonable number of jobs, but nothing to write home about.
Running the groovy script from above seems to show it spending extreme amounts of time in what looks like parsing XML files. To get the size, it's triggering the following bit of trace:
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:234)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
locked <0x00000000f9b461f0> (a java.io.BufferedInputStream)
at java.io.FilterInputStream.read(FilterInputStream.java:83)
at java.io.PushbackInputStream.read(PushbackInputStream.java:139)
at com.thoughtworks.xstream.core.util.XmlHeaderAwareReader.getHeader(XmlHeaderAwareReader.java:79)
at com.thoughtworks.xstream.core.util.XmlHeaderAwareReader.<init>(XmlHeaderAwareReader.java:61)
at com.thoughtworks.xstream.io.xml.AbstractXppDriver.createReader(AbstractXppDriver.java:65)
at hudson.XmlFile.unmarshal(XmlFile.java:163)
at hudson.model.Run.reload(Run.java:321)
at hudson.model.Run.<init>(Run.java:309)
at hudson.model.AbstractBuild.<init>(AbstractBuild.java:173)
at hudson.maven.AbstractMavenBuild.<init>(AbstractMavenBuild.java:54)
at hudson.maven.MavenModuleSetBuild.<init>(MavenModuleSetBuild.java:146)
at sun.reflect.GeneratedConstructorAccessor58.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at jenkins.model.lazy.LazyBuildMixIn.loadBuild(LazyBuildMixIn.java:153)
at jenkins.model.lazy.LazyBuildMixIn$1.create(LazyBuildMixIn.java:134)
at hudson.model.RunMap.retrieve(RunMap.java:218)
at hudson.model.RunMap.retrieve(RunMap.java:56)
at jenkins.model.lazy.AbstractLazyLoadRunMap.load(AbstractLazyLoadRunMap.java:687)
locked <0x0000000082951908> (a hudson.model.RunMap)
at jenkins.model.lazy.AbstractLazyLoadRunMap.load(AbstractLazyLoadRunMap.java:670)
at jenkins.model.lazy.AbstractLazyLoadRunMap.getById(AbstractLazyLoadRunMap.java:542)
at jenkins.model.lazy.BuildReferenceMapAdapter.unwrap(BuildReferenceMapAdapter.java:42)
at jenkins.model.lazy.BuildReferenceMapAdapter.access$200(BuildReferenceMapAdapter.java:27)
at jenkins.model.lazy.BuildReferenceMapAdapter$SetAdapter._unwrap(BuildReferenceMapAdapter.java:356)
at jenkins.model.lazy.BuildReferenceMapAdapter$SetAdapter.access$400(BuildReferenceMapAdapter.java:248)
at jenkins.model.lazy.BuildReferenceMapAdapter$SetAdapter$1.adapt(BuildReferenceMapAdapter.java:271)
at jenkins.model.lazy.BuildReferenceMapAdapter$SetAdapter$1.adapt(BuildReferenceMapAdapter.java:269)
at hudson.util.AdaptedIterator.next(AdaptedIterator.java:54)
at com.google.common.collect.Iterators$7.computeNext(Iterators.java:648)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
at java.util.Collections$UnmodifiableCollection$1.hasNext(Collections.java:1101)
at java.util.AbstractMap$2$1.hasNext(AbstractMap.java:392)
at hudson.util.RunList.size(RunList.java:108)
That seems really, really expensive to perform when all the caller cares about is the size of the runlist. Regardless of anything else, that looks like an easy optimisation.
Similarly, the home page lockups seem to be because it spends a long time figuring out "what was the last successful / last failed" build, which looks to be similar in nature. I wonder if that could be cached to speed it up without having to load the entire dataset.
It's possible that it's memory pressure causing the system to dump this stuff and it having to reload. I'm going to try increasing Xmx and maybe getting some dumps to figure out what's happening. magnayn: Remember that in the case of Maven, the number of projects is (1 + number of modules that ever existed) and the number of builds likewise.
Also, reopening with much different versions of everything isn't a good idea. So far it superficially doesn't even look like the same problem.
Also, you forgot to mention the versions of everything else, like Maven Plugin.
In general, with the information you currently provide, this would be more suited to a request for assistance on the lists or IRC than a Jira issue.
magnayn
added a comment - I think it is still an issue, but the issue is much bigger (I.E: it's dumb parsing thousands of files to render a simple UI homepage).
magnayn
added a comment - I think it is still an issue, but the issue is much bigger (I.E: it's dumb parsing thousands of files to render a simple UI homepage).
I may increase a little bit the server heap and reduce the memory of executors or their numbers but I'm afraid to only move the problem for later.
About the heap dump I'm not an expert and I was also surprize to not have one of 4Gb but it finished with no error
I may try to recreate a new one tomorrow to see if it is larger and with more details