The reason I asked was out of curiosity, not because of any problem. A MS engineer told us that if the DIT is small enough in relation to the amount of RAM in the DC, the entire DIT would be cached, increasing directory query performance. I was just curious if there was a way to objectively measure this. It's always interesting to measure things to see how changes affect performance. For example, if I delete a large number of objects and wait for the tombstones to age out, I know I could shrink the DIT with an offline defrag. Would doing so have any measurable effect on perfomance ? I don't know, but it would be interesting to do some before and after measurements to find out.
By the way, the context of the conversation was that the engineer was recommending offline defrags after removing a large number of objects (and waiting the requisite time for garbage collection). I have no argument with that, but it's nice to be able to measure what if anything it's buying (besides a smaller DIT file). Some of us are just funny that way, I guess.... Dave -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Carlos Magalhaes Sent: Friday, April 15, 2005 4:27 AM To: [email protected] Subject: RE: [ActiveDir] How much of the DIT is cached in RAM ? Well none of the actually DIT is cached (into the RAM), IMO. The engine might cache regular/common lookups, indexes etc but none to the actually DC's RAM. But then again you have to define but what you mean by "into RAM". Nathan is quite right with "Checking the working set size of LSASS is not reliable." There are many more processes that the LSASS is taking care of. You could dump the LSASS process and take a look and then determine from there what is happening. But now I am curious why you asking :P Do you have a hungry LSASS process? If you do what Patch/Service Pack level do you have on that box? Carlos Magalhaes -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Nathan Muggli Sent: 15 April 2005 06:10 AM To: [email protected] Subject: RE: [ActiveDir] How much of the DIT is cached in RAM ? Checking the working set size of LSASS is not reliable. There's process overhead for things like lsa session handles and other stuff related to the security sub system. The most accurate method is to enable the ESE Database performance counters and look at "Cache Size". To enable the DB counters, install Server Performance Advisor, or check out http://www.microsoft.com/resources/documentation/Windows/2000/server/res kit/en-us/Default.asp?url=/resources/documentation/Windows/2000/server/r eskit/en-us/distrib/dsbm_mon_pzgc.asp -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Roger Seielstad Sent: Thursday, April 14, 2005 8:45 PM To: [email protected] Subject: RE: [ActiveDir] How much of the DIT is cached in RAM ? By checking the working set size of by LSASS? -------- Roger Seielstad E-mail Geek > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Fugleberg, David A > Sent: Thursday, April 14, 2005 2:22 PM > To: [email protected] > Subject: [ActiveDir] How much of the DIT is cached in RAM ? > > How can I determine how much of the DIT is being cached in > RAM on a given DC ? > > Dave > List info : http://www.activedir.org/List.aspx > List FAQ : http://www.activedir.org/ListFAQ.aspx > List archive: > http://www.mail-archive.com/activedir%40mail.activedir.org/ > > List info : http://www.activedir.org/List.aspx List FAQ : http://www.activedir.org/ListFAQ.aspx List archive: http://www.mail-archive.com/activedir%40mail.activedir.org/ List info : http://www.activedir.org/List.aspx List FAQ : http://www.activedir.org/ListFAQ.aspx List archive: http://www.mail-archive.com/activedir%40mail.activedir.org/ List info : http://www.activedir.org/List.aspx List FAQ : http://www.activedir.org/ListFAQ.aspx List archive: http://www.mail-archive.com/activedir%40mail.activedir.org/ List info : http://www.activedir.org/List.aspx List FAQ : http://www.activedir.org/ListFAQ.aspx List archive: http://www.mail-archive.com/activedir%40mail.activedir.org/
