Office 2000, Outlook 2000 on our servers. -----Original Message----- From: Chris Lynch [mailto:lynch00@xxxxxxx] Sent: Wednesday, March 12, 2003 12:25 PM To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: Context Switches =20 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I'm wondering. Do you guys have Outlook XP installed on these servers? = If so, we have a client that is having an issue where Outlook prompts = the user about it failed to start properly the previous time and to = start in safe mode. If the user clicks on no, then the server stops = responding, causing issues with users logging in, and working on the = server. We haven't come up with anything, other than it could be a TS = Roaming profile issue. Chris - -----Original Message----- From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On = Behalf Of Pfeifer, Bruce A MSER:EX Sent: Wednesday, March 12, 2003 12:04 PM To: 'thin@xxxxxxxxxxxxx' Subject: [THIN] Re: Context Switches What a coincidence that we are having a similar problem to Chad's, over = the past couple weeks. In our situation it appears that the context switches go through the = roof, which cause the Perfmon counters to fail, which then causes IMA to = hang, then the server stops responding to the farm, users can't login = and so on. A couple times we have been able to restart the IMA service but = unfortunately a few of the other occurrences needed a reboot to clear = the problem. Normally we see the context switches spike up to 250,000 on = our ML570 4 way servers, but the spikes do not last long enough to = trigger an RMS alert. =20 With the recent problem the context switches hit a very steady 120,000 = and continue. We have not been able to track down the cause (and are = not really sure how to trace it). Looking at the comment re paging from Bernd, I looked at our paging logs = to find that when the problem occurs the pages/sec drops down to almost = nothing, the Page file % usage remains normal, % processor time = increases about 30% and Processor interrupt time remain normal. - -----Original Message----- From: Schneider, Chad M. [mailto:CMSchneider@xxxxxxxxx] Sent: Wednesday, March 12, 2003 11:24 AM To: 'thin@xxxxxxxxxxxxx' Subject: [THIN] Re: Context Switches I will get some revamped numbers tomorrow. - -----Original Message----- From: Bernd Harzog [mailto:Bernd.Harzog@xxxxxxxxxxx] Sent: Wednesday, March 12, 2003 12:51 PM To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: Context Switches Well pages/sec can't be zero if you are getting page faults since page = faults are a form of page file activity. But that aside, 100 page faults = a second is a low number and to me indicates that page file activity as = not the driver of a kernel mode issue if that is what you have. I am = going to ask some folks around here who know more than I do what a good = next step might be to see if we can help you out. But, it sounds like a = user mode issue to me, which means that I do not know what to tell you. Cheers, Bernd Harzog CEO RTO Software 678-455-5506 x701 bernd@xxxxxxxxxxx www.rtosoft.com -----Original Message----- From: Schneider, Chad M. [mailto:CMSchneider@xxxxxxxxx]=3D20 Sent: Wednesday, March 12, 2003 1:22 PM To: 'thin@xxxxxxxxxxxxx' Subject: [THIN] Re: Context Switches Pages /sec. @ nothing... Page Faults/sec. @ 100. - -----Original Message----- From: Bernd Harzog [mailto:Bernd.Harzog@xxxxxxxxxxx] Sent: Wednesday, March 12, 2003 12:04 PM To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: Context Switches Let me add my two cents. There are as Ron said two kinds of context = switches. One kind occurs when the processor switches between two user = mode tasks. So, if Ron and I are both running an application on the same = server when the CPU switches between doing work for Ron and work for me, = that causes a context switch. That is a GOOD context switch, because it = is indicative of the CPU doing what it is suppose to do, which is move = so rapidly between doing work for different users that each user never = notices. The second type of context switch occurs when the CPU goes from = user mode to kernel mode, and then back again (two Context Switches). = These are BAD context switches, because when the CPU goes into Kernel = mode it blocks user mode operations and slows everything down. So, you need to find out what kind of context switches you are getting. = Since MS does not do us the favor of breaking them out, the only way to = find out is to look at other indicators of heavy Kernel Mode operations = and see if they are pegged as well. Try looking at pages/sec and page = faults/sec. If you see a heavy correlation between these and the context = switches you may have an indicator that it is kernel mode related. If it = is, call me, because I have something new that I cannot talk about on = the list that we might want to discuss. Cheers, Bernd Harzog CEO RTO Software 678-455-5506 x701 bernd@xxxxxxxxxxx www.rtosoft.com -----Original Message----- From: Ron Oglesby [mailto:roglesby@xxxxxxxxxxxx]=3D3D20 Sent: Wednesday, March 12, 2003 12:30 PM To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: Context Switches Well context switches are really the processor switching between tasks = or going between user mode and kernel mode tasks. A lot of time I think this can be due to the TYPE of application and = what it does. I have a document imaging/managing software at a client = that will get the context switches up in the 30 - 35,000 range with a = low proc queue and proc utilization at about 60%. This software uses a = tome of different types of databases (SQL, Oracle, and something else) = as different backend servers and is a little graphic intense. The NICs, = Memory, Disk, Proc all are still ok, but every time we get these things = up to 30,000 performance starts to degrade. Now of course this is 30,000 = steadily, not spikes. And only 27-30 users on DL 360 G2's Of course on = the same hardware and builds I am hosting Office apps for like 50 and 60 = users with context switches not a problem. Anyway, haven't found a relief for it yet. Hoping hyper threading has an = effect on this. Ron Oglesby Senior Technical Architect =3D3D3D20 RapidApp Office 312.372.7188 Mobile 312.961.2380 email roglesby@xxxxxxxxxxxx =3D3D3D20 - -----Original Message----- From: Schneider, Chad M. [mailto:CMSchneider@xxxxxxxxx]=3D3D3D20 Sent: Wednesday, March 12, 2003 11:20 AM To: 'thin@xxxxxxxxxxxxx' Subject: [THIN] Re: Context Switches I know one really spiked, as the chart now shows the 125,000 marker. - -----Original Message----- From: Ron Oglesby [mailto:roglesby@xxxxxxxxxxxx] Sent: Wednesday, March 12, 2003 11:02 AM To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: Context Switches 100,000... Cooooool What type of hardware. DL 360s start to get slow at like 30,000 Ron Oglesby Senior Technical Architect =3D3D3D3D20 RapidApp Office 312.372.7188 Mobile 312.961.2380 email roglesby@xxxxxxxxxxxx =3D3D3D3D20 - -----Original Message----- From: Schneider, Chad M. [mailto:CMSchneider@xxxxxxxxx]=3D3D3D3D20 Sent: Wednesday, March 12, 2003 10:50 AM To: 'thin@xxxxxxxxxxxxx' Subject: [THIN] Context Switches Any way to tell which app/apps are causing my large context switch = usage? My servers run high all day, some spikes over 100,000. Chad M. Schneider Technology Analyst II Curwood, Inc. 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Free 30-day eval: = http://www.rtosoft.com/Enter.asp?ID=3D79 ********************************************************** For Archives, to Unsubscribe, Subscribe or=20 set Digest or Vacation mode use the below link: = http://thethin.net/citrixlist.cfm ********************************************************* This Week's Sponsor - RTO Software / TScale TScale increases terminal server capacity.=20 Get 30-40% more users per server to save $$$ and time.=20 Add users now! - not more servers. If you're using Citrix,=20 you must learn about TScale! Free 30-day eval: = http://www.rtosoft.com/Enter.asp?ID=3D79 ********************************************************** For Archives, to Unsubscribe, Subscribe or=20 set Digest or Vacation mode use the below link: = http://thethin.net/citrixlist.cfm -----BEGIN PGP SIGNATURE----- Version: PGP 8.0 Comment: Public PGP key for Chris Lynch iQA/AwUBPm+XlG9fg+xq5T3MEQLEZACg6LaZg0QYWuM1iyazphGC4T0vJVwAnRYR ailXeHpJyTH/oYJcJb7ErnDX =3Dz454 -----END PGP SIGNATURE----- ********************************************************* This Week's Sponsor - RTO Software / TScale TScale increases terminal server capacity. Get 30-40% more users per server to save $$$ and time. Add users now! - not more servers. If you're using Citrix, you must learn about TScale! Free 30-day eval: http://www.rtosoft.com/Enter.asp?ID=79 ********************************************************** For Archives, to Unsubscribe, Subscribe or set Digest or Vacation mode use the below link: http://thethin.net/citrixlist.cfm ********************************************************* This Week's Sponsor - RTO Software / TScale TScale increases terminal server capacity. Get 30-40% more users per server to save $$$ and time. Add users now! - not more servers. If you're using Citrix, you must learn about TScale! Free 30-day eval: http://www.rtosoft.com/Enter.asp?ID=79 ********************************************************** For Archives, to Unsubscribe, Subscribe or set Digest or Vacation mode use the below link: http://thethin.net/citrixlist.cfm