We are seeing very slow performance that all seem to point to the Lucene search engine using JIRA 6.3. Our JIRA instance is running on a 32CPUx84GB machine, with 24GB configured for the JVM. Despite not seeing any indicators that there is a resource shortage on the server, accessing Jira through the web interface is slow. Browsing a project summary takes 26-30 seconds to respond. While the searches take that long to return , the load average on the host is 0.77, and there are 0 processes with any IOWait percentage.
If I do a thread dump there are 16 threads in this same place:
"http-bio-127.0.0.1-8000-exec-307" daemon prio=10 tid=0x00007fe3c0001000 nid=0x21aa runnable [0x00007fe6f7b83000]
at sun.misc.Unsafe.getByte(Native Method)
We reindex regularly...
If I turn on Profiling, the Lucene search provider typically uses about 98% of the time.
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