Increased CPU usage
Problem reported by Nikola Kuzmanovic - April 23 at 6:21 AM
Submitted
Hello,
we have noticed similar issue with high CPU usage on multiple SmarterMail instances with different versions.
 
From what we have diagnosed, all the instances have increased counter .NET Remoting > Remote Calls/sec for MailService which directly correlates with high CPU usage:
 
This is an SmarterMail instance with one domain, with all the services stopped, and without any external network connections.
 
Here is a Process Explorer screenshot:
 
Restarting the MailService resolves the problem, but it occured next day at 13:00 (there are no scheduled tasks defined on this system).
 
 

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0
echoDreamz Replied
Ours stops responding every-single-night between 6-7PM... So join the fun club. Ours though, CPU drops to 0 and the server stops responding for many seconds, then CPU usage skyrockets, then the cycle repeats until restarted.

Did you see the changelog for 16.3.6684 https://www.smartertools.com/smartermail/release-notes/16 it does mention reduced CPU usage for an issue with duplicate events.

Christopher

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Nikola Kuzmanovic Replied
We've upgraded to 16.3.6684. We'll see how it behaves today.
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Nikola Kuzmanovic Replied
Same issue with 16.3.6684.
At the exact same time of day (12:00), CPU increases to 50%, then after 1 hour it goes ballistic to 100%.
CPU usage chart from PRTG:

Again, all the services are stopped, there are no connections to server. 
1
Robert Emmett Replied
Employee Post
Nikola, if you are willing, I would suggest opening a ticket support. We can then provide you with a profiling build and if used in conjunction with JetBrain's dot Trace and dot Memory at the time in which the server CPU increases, we will be able to gather very detailed dump information.
Robert Emmett
Software Developer
SmarterTools Inc.
(877) 357-6278
www.smartertools.com
0
Merle Wait Replied
Would love to hear the results
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Nikola Kuzmanovic Replied
Hi Robert, I've opened a support ticket.
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Adam Botbyl Replied
Was there any resolve on this issue? Even with the latest builds I'm having SmarterMail still eat up 100% of my cpu pretty constant and about once a week or so having to restart services to get webmail to work at any decent speed.
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Robert Emmett Replied
Employee Post
Adam, can you run a file proc on your server and see if any particular calendarData.xml file is getting written to more than usual?  I have had a couple of tickets where there were calendars with hundreds of duplicate entries which was directly contributing to the slow down.
Robert Emmett
Software Developer
SmarterTools Inc.
(877) 357-6278
www.smartertools.com
0
Adam Botbyl Replied
Robert, I don't see anything out of the ordinary pegging high I/O, when we're in 100% cpu we're only averaging about 2-300 kbytes/sec disk I/O.

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