I have a small jenkins installation (aprox. 20 build jobs, run only ocasionally, aprox. 2 builds per day), which becomes unresponsive from time to time. When I look at the stack-trace of Jenkins, I see the disk-usage thread being active and causing huge I/O on the disk and taking quite some time.

I will research if there are better ways to retrieve directory size than to iterate with listFiles()...

"Project disk usage thread" prio=10 tid=0x00007f9f2800b800 nid=0x37a8c0 runnable [0x00007f9f3454a000]
java.lang.Thread.State: RUNNABLE
at java.io.UnixFileSystem.getBooleanAttributes0(Native Method)
at java.io.UnixFileSystem.getBooleanAttributes(UnixFileSystem.java:228)
at java.io.File.isDirectory(File.java:754)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.getFileSize(DiskUsageThread.java:161)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.getFileSize(DiskUsageThread.java:165)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.getFileSize(DiskUsageThread.java:165)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.getFileSize(DiskUsageThread.java:165)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.getFileSize(DiskUsageThread.java:165)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.getFileSize(DiskUsageThread.java:165)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.getFileSize(DiskUsageThread.java:165)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.getFileSize(DiskUsageThread.java:165)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.getFileSize(DiskUsageThread.java:165)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.getFileSize(DiskUsageThread.java:165)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.call(DiskUsageThread.java:155)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.call(DiskUsageThread.java:142)
at hudson.FilePath.act(FilePath.java:870)
at hudson.plugins.disk_usage.DiskUsageThread.calculateWorkspaceDiskUsage(DiskUsageThread.java:125)
at hudson.plugins.disk_usage.DiskUsageThread.execute(DiskUsageThread.java:60)
at hudson.model.AsyncPeriodicWork$1.run(AsyncPeriodicWork.java:53)
at java.lang.Thread.run(Thread.java:662)