What you are seeing is the result of a badly configured paging subsystem - look at your DASD performance when you run this. What happens: Linux touches all it's pages when it boots. These pages then overtime get paged out. Then you run your program - and all those pages get paged back in. Please let us know what kind of paging devices you are using? If it is typical lab stepchild hardware, it might be a measure of RVA on ESCON rather than ESS on FICON. Big difference.
Applications with more consistent workings sets would not see this. > In following up on some performance problems on the > zSeries, we've noticed that the zSeries is very > sensitive to working set size, especially for writes. > This may explain some of the "poor" performance that > people ascribe to the zSeries. > > Is locality of reference as senstive on other > platforms? How does this effect such things as VM EC > guests, data base programs with large tables, and java > programs? > "If you can't measure it, I'm Just NOT interested!"(tm) /************************************************************/ Barton Robinson - CBW Internet: [EMAIL PROTECTED] Velocity Software, Inc Mailing Address: 196-D Castro Street P.O. Box 390640 Mountain View, CA 94041 Mountain View, CA 94039-0640 VM Performance Hotline: 650-964-8867 Fax: 650-964-9012 Web Page: WWW.VELOCITY-SOFTWARE.COM /************************************************************/
