> > Last night I spent some time to check the "D" stat. > It's kinda of tricky, why my intuition tells me that those jobs run in > foreground, not background, won't have such problem. "In particular, users are asked to run only one background job at a time." from http://www.washington.edu/computing/unix/background.html now I know why there are so many "D" for those background jobs. if I am wrong, please let me know, Thanks,