High CPU usage for ReportingServicesService.exe
Hi, We are using Reporting Services 2008 and we upgraded our Report Server databases from MSRS 2005 in October 2009. We had seven incidents in January where the CPU jumped to 100% and remained there until the server was rebooted or the Report Server was restarted. In February, we have had seven more incidents where the CPU escalated to >80% but we proactively restarted the Report Server in order to avoid a 100% CPU condition. Although the CPU spikes start at a time when reports are running, the CPU will remain at 80-100% even after the reports have finished and there is nothing in the "queue" (ReportServer..Event table). The first time (before we had a monitor in place), the 100% CPU condition lasted for 72 hours. Task manager shows that the ReportingServicesService.exe process is the culprit, consuming 99-100% of the CPU. I have examined the ExecutionLogStorage for the periods when the CPU spikes occur and I have also examined the ReportServerService log files. However, at this time I have been unable to find a consistent pattern or a single report that would be causing the CPU spike. We have some good graphs of the incidents and I have examined them looking for patterns. The spikes don't appear to always happen in the same way. For instance, sometimes the CPU goes straight to 80% while other times the CPU climbs to 80% over a few hours. We are running Reporting Services in a multi-tier topology with the Reporting Services server separated from the RSDB report catalog server. The sources of the reporting data are varied and exist on remote servers, including SQL Server 2000, 2005, and Oracle. Both Reporting Services servers are Intel Xeon 2.5-2.83 GHz dual quad core servers with 64-bit Windows 2008 Enterprise (SP1) without Hyper-V. Each server has 32 GB of memory. The SQL Server with the ReportServer databases is SQL 2008 (SP1) standard edition. The Reporting Services installation is 2008 (SP1) enterprise edition. I called in to open a case with Microsoft today but she recommended posting on the Technet first since we are able to restart the service without impacting users. Obviously, this is not a valid long-term solution. The issue is similar to this one on MS CSS blog but we don't have any custom code http://blogs.msdn.com/psssql/archive/2009/12/09/high-cpu-with-reporting-services-2008.aspx?CommentPosted=true
February 23rd, 2010 10:59pm

I suggest you open a case with CSS, or open a bug on msconnect. Please take a full memory dump of ReportingServicesService.exe when the 100% CPU problem happens.
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February 24th, 2010 1:13am

I posted it on Connect a couple weeks ago and Lucasz also suggests opening a CSS. When I called CSS yesterday, they recommended posting it on Technet first. I would like to gather a memory dump but I haven't been able to find documentation on this process. Can you point me in the right direction? Thanks James.
February 24th, 2010 6:55pm

What does the Profiler say is going on? I suspect you have a blocking/lock issue that's preventing completion of one operation in favor of another. What's also on the Reporting Services server? SQL Server (of course) but is that the data server as well? What about a print/domain/dns/sharepoint service? For best performance, RS should be the only service on the system. hthWilliam (Bill) Vaughn -- Mentor, Author, Dad and MVP Hitchhiker's Guide to Visual Studio and SQL Server (7th Edition) http://betav.com http://betav.com/blog/billva
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March 1st, 2010 12:46am

I've been seeing something very similar. Since upgrading our "Enterprise" report server from SQL/SSRS 2005 to 2008 a couple of months ago, we've had 3 incidents (roughly separated by 2 weeks per incident) where the CPU goes to 100% on the box. (It's a dedicated SSRS server, 64bit Enterprise edition all the way, lots of CPU and memory - most of the time it's just idling.) The first two times I stopped and restarted SSRS to remedy the issue, but with the incident yesterday I dug further. The majority of the reports hit a "Query" server and I did see some blocking happening there that coincided with the CPU spike. After spid-killing off about 10 of these reports, CPU on the SSRS server dropped back to normal levels. So, you may try looking at SQL activity via sp_who2 on the instances that the report queries are actually hitting and see if you see something similar.I'm wondering if the root fix for this issue is just poorly written reports? Why didn't this manifest itself when I was on SSRS 2005? The reports haven't changed since the upgrade... any other thoughts/speculations/suggestions?
March 5th, 2010 5:38pm

We have seen similar problems when reporting from an Oracle Data source, with a very long running query. CPU spikes big and stays there until the report is killed... There was no sorting etc on the SSRS side, but there was some grouping.... Killing the report from Report manager didn't work either - because the Oracle thread never went away....Only when we killed the thread on the Oracle side - then we got relief.Managing Consultant - Mariner
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March 5th, 2010 6:36pm

I dont have any report or whatever using sql server 2008 too My laptop suddenly hot, I see task manager 100% too ReportingServicesService.exe taking all my cpuMy Brain Speak
May 2nd, 2010 10:26am

Hi, I am having the same issue,did you find the solution?
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October 26th, 2010 1:09am

Thanks ShannonMaala
November 5th, 2010 12:36pm

hi I Have the same problem. Did you find a solution ? Patrickpi
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March 14th, 2011 4:28am

Same problem which happens every now and then but apart from restarting the service cant seem to see any solution.
March 14th, 2011 11:14am

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