Re: locked page limit
From: Stanley Feng \(MSFT\) (sfeng_at_online.microsoft.com)
Date: 07/10/04
- Next message: Gary Chanson: "Re: CreateProcessWithLogonW and STARTF_USESHOWWINDOW"
- Previous message: qfel: "Re: CreateProcessWithLogonW and STARTF_USESHOWWINDOW"
- Messages sorted by: [ date ] [ thread ]
Date: Sat, 10 Jul 2004 15:44:48 -0700
Mathew,
Why don't you use a perfmon to observe NP/locked page usage?
-- This posting is provided "AS IS" with no warranties, and confers no rights. Use of included script samples (if any) are subject to the terms specified at http://www.microsoft.com/info/cpyright.htm" "Mathew Joy" <mathewjoyatxlteknologies.com> wrote in message news:OtYmLoUTEHA.3660@tk2msftngp13.phx.gbl... > I've not been much clear about this for a while. Hope someone can shed > a bit of light. > > Quote from MSDN > -------------------------------------------------------------------------- -- > --- > The limit on locked memory in Windows NT and Windows 2000 is about > one-eighth the physical RAM for all applications combined. This is a > rough estimate and should not be used as an exact figure on which to > base calculations. > -------------------------------------------------------------------------- -- > --- > > Though it is said that it is a rough estimte, I guess it means that it > is almost 1/8th the total RAM. I tested this on a few machines. I > connected one socket and issued multiple overlapped recv() calls. On > machines (2 of them) that had 128MB of RAM, I was able to post around > 4000 calls (which means 4000*4k = 16MB = 1/8 * 128MB). But when I > tested it on machines with 256MB RAM I was able to post around 38000 > calls (which is almost 60% of the total RAM) and in the case of 512MB > machines I could post around 78000 calls (which is also 60% of the > total RAM). Considering locked pages as NP pool this is also far > greater than the limit (1/4 of the total RAM). Could anyone explain on > why I was able to post that many overlapped calls (all with 4K > buffer[so assuming that one call will result only on one locked page] > and tested on either NT or w2k server)? Mails to M$ on clarification > was as usual mum. > > Thanks > > -- > Regards, > Mathew Joy > >
- Next message: Gary Chanson: "Re: CreateProcessWithLogonW and STARTF_USESHOWWINDOW"
- Previous message: qfel: "Re: CreateProcessWithLogonW and STARTF_USESHOWWINDOW"
- Messages sorted by: [ date ] [ thread ]
Relevant Pages
|
