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Conference eusact::sap

Title:SAP-Notes
Moderator:OSTV03::NAKAYAMA
Created:Mon Nov 09 1992
Last Modified:Wed Feb 26 1997
Last Successful Update:Wed Feb 26 1997
Number of topics:735
Total number of notes:2563

726.0. "Unix 4.x support?" by OFOSS1::GINGER (Ron Ginger) Thu Jan 23 1997 19:00

T.RTitleUserPersonal
Name
DateLines
726.1March 1997EPS::PATILAvinash Patil, DTN:381-6176Fri Jan 24 1997 00:065
726.2USCTR1::ASCHERDave AscherFri Jan 24 1997 09:443
what makes them so sure that the issue is Advfs?
    
    d
726.3OFOSS1::GINGERRon GingerFri Jan 24 1997 18:523
    we are worried about the use of cpu0 being much higher that the others.
    We see peaks of 70% use on 0 while about 30-40% on all others. We know
    advfs does more on cpu0.
726.4single threadedTROOA::MSCHNEIDERmartin.schneider@tro.mts.dec.comSat Jan 25 1997 01:231
    As I understand it prior to V4 of UNIX, Advfs was single-threaded.
726.5USCTR1::ASCHERDave AscherSat Jan 25 1997 20:336
    70% means that there is 30% left. Doesn't sound like a bottleneck
    to me.. computes in advfs have to be a whole lot less costly
    than the i/o operations... like 1000 to 1.
    
    
726.6the Austrian opinionATZIS3::WINTERSPERGEMon Jan 27 1997 16:1911
    Hello !
    
    I agree with Dave, unless the first CPU ain't close to 100% all the
    time there should be no bottleneck from the IO load of CPU 0.
    
    				Regards
    				Thomas Wintersperger, Austria
    
    PS: Even without 4.0 you can do some ADVFS tuning with the ADVFS
    cache parameter for the Kernel, and have also a look on the # of Oracle
    db writer processes !  
726.7OFOSS1::GINGERRon GingerMon Feb 03 1997 19:049
    Yes, this customer does not TODAY have a bottleneck, but we are trying
    to look ahead. We have only their 2 small divisons on line toady, but
    in a few months the major divison is to come on line, and it brings
    more that tripple our current users. Feeling is if we are running
    arounbd 70% on CPU0, and tripple our uses we will have trouble.
    
    We do have info from SAP that v4.0 will be ready in March, and the
    customer has just delayed the startup of the new divison until July, so
    we may be OK.