Sheldon, His logic is not clear to me .....can you detail a tad more ..
Regards, Scott On Sunday, February 22, 2015, Sheldon Davis <sda...@isracard.co.il> wrote: > I have managed to recreate the problem. I will open a PMR and I will check > with the developer why he is doing what he is. > A cobol program reads input and then opens file (disp=mod) writes record > and then closes file (50k times) > > The following are the results of my tests: > > Open file write 50k records close file - > file size 30 tracks less than a second CPU > 50k times on a non extended file open write close - file > size 600 tracks 3 minutes CPU > 50k times on an extended file open write close - > file size 23000 tracks 8 minutes CPU (catalog address space doing high i/o > on vvds of disk being written to > > > > > > -----Original Message----- > > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU > <javascript:;>] > > On Behalf Of Sheldon Davis > > Sent: Wednesday, February 18, 2015 11:45 PM > > To: IBM-MAIN@LISTSERV.UA.EDU <javascript:;> > > Subject: High i/o rate and CPU usage by catalog after converting a set > > of > files > > to extended and placing them on model 54's > > > > Hi > > I am out of ideas. > > We converted a set of sequential files to be extended and changed the > > ACS routine to put the files on model 54's The following is what > happened: > > > > 1. Jobs that allocated the files took more CPU and ran much longer. > > 2. The catalog address space used about four times more CPU than usual > > and did a huge amount of I/O on the disks that the batch job used to > > allocate > and > > update the files. > > > > Thanks for any input > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send email > to lists...@listserv.ua.edu <javascript:;> with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu <javascript:;> with the message: > INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
