Re: process in background
2009/4/23 Matyas Sustik debian.l...@sustik.com: Dear Forum, I am running a video encoding process for which I would like to use all the CPU resources which would otherwise be idle. I do not want this job to get in the way of any other processes (interactive or something like mythbackend). I tried using nice -n 19 but the result is noticably slower execution of the encoding job even when there is nothing else going on. (About 30-50 slower.) Is there some other process management tool that could help achieve the goal? Thanks, Matyas After you place yor command into the background and renice it you can check what is happeneing on your system by using the program 'top'. it will let you know what programs are running and what resources are being consumed by them. Adrian -- 24x7x365 != 24x7x52 Stupid or bad maths? erno hm. I've lost a machine.. literally _lost_. it responds to ping, it works completely, I just can't figure out where in my apartment it is. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org
Re: process in background
Some more data as suggested. I run without nice, with nice -n 5 and nice -n 10, each version twice: Without nice: real0m10.662s user0m9.513s sys 0m3.448s real0m10.121s user0m7.712s sys 0m2.444s CPU% according to top reached 118%. nice -n 5: real0m22.141s user0m27.202s sys 0m1.444s real0m21.855s user0m28.674s sys 0m2.468s CPU% according to top reached 147%. nice -n 10: real0m21.638s user0m26.878s sys 0m1.268s real0m21.654s user0m27.090s sys 0m1.176s CPU% according to top reached 131%. I do not trust the accuracy of top; I only use it to see relative CPU usage of processes running *at the same time*. The above results speak for themselves. However the cpu usage reported by 'time' shows that nice incurs a hefty penalty even though the system does nothing else. I stress that I do not think that the above indicate a problem with nice. This maybe just how it works. I think I need something other than nice to tell the system that a process should be given all the spare cycles but nothing else. Any suggestions? Matyas - Every hardware eventually breaks. Every software eventually works. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org
Re: process in background
Matyas Sustik wrote at 2009-04-22 23:13 -0500: I tried using nice -n 19 but the result is noticably slower execution of the encoding job even when there is nothing else going on. (About 30-50 slower.) Is there some other process management tool that could help achieve the goal? You may want to use ionice -c3 nice -n 19 command in order to set the io scheduling class as well as the process scheduling priority. signature.asc Description: Digital signature
