2011/12/14 Zhu Yanhai <zhu.yan...@gmail.com>: > 在 2011年12月14日 下午5:30，陈竞 <cj.mag...@gmail.com> 写道： >> i got the problem, my script is wrong, it should drop the cache, or it will >> read data from cache, >> the script is : >> sync >> echo 3 > /proc/sys/vm/drop_caches >> dd if=/tmp/file1 of=/dev/null >> >> >> size of file1 is 400M, and i get new test result: >> A: blkio.weight=100 cost 11.12s speed is 37.5MB/s >> B: blkio.weight=1000 cost 6.4s speed is 65.7MB/s >> >> so the blkio.weight has some effect, bu the result is not as good as 1:10 > > No, it is good. > Blkio controller doesn't reserve bandwith for any groups, so what > happened in your test is Group B finished before Group A, and after > that Group A was able to occupy all bandwith, which made it much > faster. > So if the size of input files are the same, then the expect run time is: > For Group B: Runtime A = size / 10B > For Group A: Runtiem B = size / 10B + 0.9 * size / 11B
oops, a typo here, one couple of A and B are inverted, anyway the point still stands. -zyh > Then Runtime A / Runtime B = 0.55 > > In your test, 6.4 / 11.12 = 0.5755, so it works well. > > -- > Thanks, > Zhu Yanhai > > >> >> >> 2011/12/14 Zhu Yanhai <zhu.yan...@gmail.com> >>> >>> And neither slice_idle nor group_idle is zero? Did you change any >>> default parameters for CFQ? >>> >>> -zyh >>> >>> 在 2011年12月14日 下午4:55，陈竞 <cj.mag...@gmail.com> 写道： >>> > my io scheduler is CFQ.... So the result is weird >>> > >>> > 在 2011年12月14日 下午4:12，陈竞 <cj.mag...@gmail.com>写道： >>> > >>> >> Hi， i'm using lxc in my project, i want to control disk io speed, so i >>> >> use >>> >> blkio.weight. I test it, but the result is confusing. >>> >> I create two container A and B: >>> >> A: blkio.weight = 100 B : blkio.weight=1000 >>> >> >>> >> the running process in A and B are the same, which is bash script : >>> >> dd if=/tmp/xxx of=/dev/null >>> >> the size of xxx is 400Mb >>> >> >>> >> I suppose that A would be slower than B, since its weight is small, >>> >> while >>> >> the test turns out that B run as fast as A, they are in same speed. >>> >> Can any help me figure it out ? >>> >> PS: my kernel is 2.6.32, and lxc is 0.7.5 >>> >> -- >>> >> 陈竞，中科院计算技术研究所，高性能计算机中心 >>> >> Jing Chen HPCC.ICT.AC China >>> > >>> > >>> > >>> > >>> > -- >>> > 陈竞，中科院计算技术研究所，高性能计算机中心 >>> > Jing Chen HPCC.ICT.AC China >>> > >>> > >>> > ------------------------------------------------------------------------------ >>> > Cloud Computing - Latest Buzzword or a Glimpse of the Future? >>> > This paper surveys cloud computing today: What are the benefits? >>> > Why are businesses embracing it? What are its payoffs and pitfalls? >>> > http://www.accelacomm.com/jaw/sdnl/114/51425149/ >>> > _______________________________________________ >>> > Lxc-users mailing list >>> > Lxc-users@lists.sourceforge.net >>> > https://lists.sourceforge.net/lists/listinfo/lxc-users >>> > >> >> >> >> >> -- >> 陈竞，中科院计算技术研究所，高性能计算机中心 >> Jing Chen HPCC.ICT.AC China ------------------------------------------------------------------------------ Cloud Computing - Latest Buzzword or a Glimpse of the Future? This paper surveys cloud computing today: What are the benefits? Why are businesses embracing it? What are its payoffs and pitfalls? http://www.accelacomm.com/jaw/sdnl/114/51425149/ _______________________________________________ Lxc-users mailing list Lxc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lxc-users
