Vivek Goyal wrote: ... > + mount -t cgroup -o io,blkio none /cgroup > + > +- Create two cgroups > + mkdir -p /cgroup/test1/ /cgroup/test2 > + > +- Set weights of group test1 and test2 > + echo 1000 > /cgroup/test1/io.ioprio > + echo 500 > /cgroup/test2/io.ioprio
Here seems should be /cgroup/test2/io.weight > + > +- Create two same size files (say 512MB each) on same disk (file1, file2) and > + launch two dd threads in different cgroup to read those files. Make sure > + right io scheduler is being used for the block device where files are > + present (the one you compiled in hierarchical mode). > + > + echo 1 > /proc/sys/vm/drop_caches > + > + dd if=/mnt/lv0/zerofile1 of=/dev/null & > + echo $! > /cgroup/test1/tasks > + cat /cgroup/test1/tasks > + > + dd if=/mnt/lv0/zerofile2 of=/dev/null & > + echo $! > /cgroup/test2/tasks > + cat /cgroup/test2/tasks > + > +- At macro level, first dd should finish first. To get more precise data, > keep > + on looking at (with the help of script), at io.disk_time and > io.disk_sectors > + files of both test1 and test2 groups. This will tell how much disk time > + (in milli seconds), each group got and how many secotors each group > + dispatched to the disk. We provide fairness in terms of disk time, so > + ideally io.disk_time of cgroups should be in proportion to the weight. > + (It is hard to achieve though :-)). -- Regards Gui Jianfeng _______________________________________________ Containers mailing list [email protected] https://lists.linux-foundation.org/mailman/listinfo/containers _______________________________________________ Devel mailing list [email protected] https://openvz.org/mailman/listinfo/devel
