On Di, 2017-01-10 at 13:29 -0800, Frank Filz wrote: > I did some testing between having dirent caching and not (Dir_Max > left > default, or Dir_Max set to 1): > > With 10000 files, dirent caching enabled > real 0m1.940s > real 0m3.652s > real 0m2.409s > real 0m1.968s > real 0m2.098s > real 0m2.209s > real 0m3.792s > real 0m2.625s > real 0m2.201s > real 0m2.963s > > With 10000 files, dirent caching disabled > real 0m2.423s > real 0m4.142s > real 0m3.883s > real 0m2.939s > real 0m2.283s > real 0m5.105s > real 0m3.050s > real 0m3.609s > real 0m2.574s > real 0m2.727s
Do you see any differences w/ and w/o caching if the directory is being modified while you're executing ls -l (like adding / removing files or changing attributes) ? I remember having to deal with customers doing something alike with >200k files in a single directory and the execution time jumped up to 10-30 minutes. Cheers Swen > > It looks like dirent caching does buy us something, though > interestingly the > initial populating tends to be the quickest run... > > These were run with Ganesha having freshly started, and the following > script: > > mount /mnt4 > time ls -l /mnt4/test1/many | wc > echo 3 > /proc/sys/vm/drop_caches > time ls -l /mnt4/test1/many | wc > echo 3 > /proc/sys/vm/drop_caches > time ls -l /mnt4/test1/many | wc > echo 3 > /proc/sys/vm/drop_caches > time ls -l /mnt4/test1/many | wc > echo 3 > /proc/sys/vm/drop_caches > time ls -l /mnt4/test1/many | wc > echo 3 > /proc/sys/vm/drop_caches > time ls -l /mnt4/test1/many | wc > echo 3 > /proc/sys/vm/drop_caches > time ls -l /mnt4/test1/many | wc > echo 3 > /proc/sys/vm/drop_caches > time ls -l /mnt4/test1/many | wc > echo 3 > /proc/sys/vm/drop_caches > time ls -l /mnt4/test1/many | wc > echo 3 > /proc/sys/vm/drop_caches > time ls -l /mnt4/test1/many | wc > echo 3 > /proc/sys/vm/drop_caches > umount /mnt4 > > With the results piped to grep real. > > Frank > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > > ------------------------------------------------------------------- > ----------- > Developer Access Program for Intel Xeon Phi Processors > Access to Intel Xeon Phi processor-based developer platforms. > With one year of Intel Parallel Studio XE. > Training and support from Colfax. > Order your platform today. http://sdm.link/xeonphi > _______________________________________________ > Nfs-ganesha-devel mailing list > Nfs-ganesha-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/nfs-ganesha-devel > ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today. http://sdm.link/xeonphi _______________________________________________ Nfs-ganesha-devel mailing list Nfs-ganesha-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs-ganesha-devel
