Restarting the service broker queue cleared the issue instantly. There’s a bunch of other columns that you might be interested in from these DMVs – but in my case I just wanted the session ids.įrom there I could go back to sys.sysprocesses and see that in this case it was a system service broker process that was pegging the CPU. On s.scheduler_address = w.scheduler_address Or if you want to put it all together you get something like. select task_address from sys.dm_os_workersĪnd finally putting the task addresses into sys.dm_os_tasks gave me the session ids. Putting the scheduler addresses into sys.dm_os_workers gave me task addresses. select scheduler_address from sys.dm_os_schedulers Using sys.dm_os_schedulers with the ids of the two rogue CPUs gave me the scheduler addresses. Armed with the ids I hit SQL Server and some DMVs. Using process explorer this way I found that CPU usage was jumping up and down but there were two CPUs that were sitting at 100% consistently. The Suite is a bundling of the following selected Sysinternals Utilities: AccessChk, AccessEnum, AdExplorer, AdInsight, AdRestore, Autologon, Autoruns, BgInfo, BlueScreen, CacheSet, ClockRes, Contig, Coreinfo, Ctrl2Cap, DebugView, Desktops, Disk2vhd, DiskExt, DiskMon, DiskView, Disk Usage (DU), EFSDump, FindLinks, Handle, Hex2dec, Junction. At the time I was too busy trying to fix the problem to take screenshots for later use Note: The screenshots above are not from the actual issue. Hovering over the individual graphs will give the CPU id. Tick the “Show one graph per CPU” option. Open process explorer and click on one of the small graphs near the top to get a detailed view. The executable can be downloaded and run without any installation. If you haven’t already discovered it, process explorer is a great free lightweight diagnostic tool from the sys internals team. Next step was to run process explorer on the server to narrow down which CPU’s were spiking. Most Windows system administrators have a directory called C:\bin which. ctrl-shift-esc for a one-stop task mgr launch. There is also a option in process explorer to replace task manager, then it launches when you hit c-a-d and select task manager. Looking at sys.sysprocesses it wasn’t immediately obvious what session could be responsible. exe filename is procexp.exe, look for that and double-click it. But this is a busy OLTP production server and I needed to isolate the process or processes responsible. I could see from looking at task manager on the server that the SQL process was responsible for the CPU usage. On one such Friday afternoon, in the not too distant past, one of the DBA team noticed that CPU was running hot on our main production server. Next minute you’re phoning home and dinner’s in the warmer. Just shutting down the last applications when a call or a page comes in. I do know that I have been on the receiving end a few times. The software allows in fact to force the closure of the session without that there is a risk of losing files.What is it about 4:45 pm on a Friday afternoon that makes CPUs spike, drives crash, databases corrupt? I wish I knew but I don’t. When the system has multiple users, it appears that some sessions may be closed normally. In case there are any doubts about a process, the software can perform a search on Google with a few clicks, to be fixed on the source program. The software can replace the Windows Task Manager by allowing to kill / suspend a process, put it in the foreground, reduce it to an icon, or even change its priority in the allocation resources. Process Explorer allows you to view all Windows processes running in the form of a tree and taking into account their dependencies. For each process it is displayed detailed information such as performance, network access made, etc. It allows to monitor the activity of process in use by the system, making it possible to determine the folders, files and registry keys that an application has accessed. Using Windows Explorer, double-click PROCEXP.EXE to start Process Explorer. Extract the PROCEXP.EXE application from the WinZip file to a convenient folder on the Windows PC. It follows the general lead of the built-in Windows Task Manager tool. Download Process Explorer from Microsoft at Download Process Explorer. Process Explorer is a system resources monitoring tool for Windows operating systems. Process Explorer is a useful software developed for identifying suspicious or buggy process or investigate why a particular DLL is locked in writing. To run Process Explorer do the following: 1. Process Explorer is a software that successfully replaces the Windows Task Manager offering in the same time the possibility of getting fast information about the processes using the Internet.
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