Hi All, We are using Windows 2008 R2 and IIS 7.5 to run our web services. Recently the available memory continue dropping down. We write a tool and dump all processes' memory every 8 hours, and find that TrustedInstaller continue increasing memory every time, and after 4 days, it increased mem by 64,155,648 byte: time, WorkingSet64, PagedSystemMemory, PeakWorkingSet64 11/11/2010 11:39:14 AM,198225920,110264,198238208 11/11/2010 7:39:16 PM,206020608,110264,206049280 11/12/2010 3:39:17 AM,213958656,110264,216592384 11/12/2010 11:39:19 AM,221859840,110264,221888512 11/12/2010 7:39:20 PM,229883904,110264,229912576 11/13/2010 3:39:22 AM,236118016,110264,240041984 11/13/2010 11:39:22 AM,242008064,110264,242036736 11/13/2010 7:39:24 PM,248147968,110264,248180736 11/14/2010 3:39:25 AM,254459904,110264,257429504 11/14/2010 11:39:27 AM,258170880,110264,258199552 11/14/2010 7:39:28 PM,259919872,110264,259948544 11/15/2010 3:39:30 AM,262381568,110264,267046912 Any idea? Regards, Stone

Hi, I suggest we try to check what the TrustedInstaller is doing on your system. By default, it’s Manual service and will not start itself. Download Process Explorer from the link below: http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx Run it on your server. Find TrustedInstaller, switch to Performance tab, please capture a screenshot and save it to jpg file via Mspaint, switch to Threads tab, capture a screenshot too and save it. Click View menu, check Show Lower Pane. Enlarge Lower Pane to show all information, capture a screenshot. Upload these files to Windows Live SkyDrive (http://www.skydrive.live.com/). If you would like other community member to analyze the report, you can paste the link here, if not, you can send the link to tfwst@microsoft.com (with this thread title or link in the email. Please don’t share documents with this address). Thanks.This posting is provided "AS IS" with no warranties, and confers no rights. Please remember to click "Mark as Answer" on the post that helps you, and to click "Unmark as Answer" if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hi, Sorry for the delay. From the screenshot of Performance tab, it’s very normal, it’s Working Set memory is even less than my lab system. It seems memory was used by your services, it’s not bad. Do you have any performance problem? If not, we can safely ignore it. Please read the following article to get more information about Windows memory and cache. Why Does Vista Use All My Memory? (It also apply to Windows 7) http://www.codinghorror.com/blog/2006/09/why-does-vista-use-all-my-memory.html Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information. Too Much Cache? http://blogs.msdn.com/b/ntdebugging/archive/2007/11/27/too-much-cache.aspx Thanks.This posting is provided "AS IS" with no warranties, and confers no rights. Please remember to click "Mark as Answer" on the post that helps you, and to click "Unmark as Answer" if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.