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Jira Slow at Specific Times

Jh_q2htoj

We are having an issue where Jira is very slow/unresponsive during a specific time-frame every day. During this slow-down time, creating, updating, and commenting tickets take a full minute. Loading between pages or projects is either very slow or throws "Internal Error Occurred" errors. This is a Windows 2016 VM on vCenter and it has 12vcpu and 32GB RAM on a Performance disk. We have increased the JVM RAM as well. When we do a disk access speed test, they are very high during non-peak hours.

We have ruled out automated backups, antivirus, and contention with other applications on the same VM. Anyone have ideas besides moving to Linux?

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Brant Schroeder

@Jh

I have seen this on windows machines caused by many different things. I would like you to answer a couple of things for me.

During these slowdowns what is happening with the resources? If the CPU really tapped or the RAM?
Is your DB on a different server? How many threads are open on Jira and on the DB?
Is the DB hosting other applications, DB, etc. that could also be taxing the connections/threads.
I know that you said you eliminated anti-virus. Can you confirm that the anti-virus is not doing real-time scans. I have seen anti-virus kick off when new files are uploaded and during peak times when the uploads are heavy this has caused heavy CPU usage on the server and threads to slow down making the system slow.

Look forward to getting additional information back.

Jh_q2htoj

@Brant Schroeder

CPU gets tapped, not so much memory
DB is on the same server
Can you clarify what you mean by how many threads?
Not hosing other apps
I un-installed AV to test

Brant Schroeder

@Jh

Great so we know that the CPU is the issue if it is tapped when you are having the slowness. The CPU only has so many threads to process information on. The CPU is serving both the server and DB which could be the issue, you might not be sized correctly. Couple more questions.

Is the DB only hosting Jira or do other application use it?
Is the server only hosting Jira and the DB or are other application running on it?
When the CPU spikes what applications are using all the CPU?

In regards to DB threads and DB threads in Jira it is how many connections you are allowing. This can be an issue if there are not enough of them. https://confluence.atlassian.com/adminjiraserver/tuning-database-connections-938846864.html The information you provide above will help determine the issue.

Jh_q2htoj

@Brant Schroeder

Sorry, I was mistaken, it seems both CPU and RAM are tapped. Task Manager shows both around ~60% load.
DB is only hosting Jira, no other applications use it
Server is only hosting JIra and the MSQL DB
The Apache Commons Daemon Service Runner with Atlassian Jira service is using bulk of the CPU.
The link you sent does not work unfortunately.

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