A pvfs2 I/O test (for comments) =================== pvfs version: 2.7.1 configuration: 1 meta server + 3 data servre. Each server has 2 cpus reserved
Tests: within pvfs2; from pvfs2 to local; nfs Use pvfs2-cp-r, pvfs2-cp-r.pl, and cp (thanks Mark Bartelt for providing pvfs2-cp-r and pvfs2-cp-r.pl) Source direcotry: WRF df -k WRF lots of subdirctories 511868 WRF (1) pvfs2 -> pvfs2 time pvfs2-cp-r WRF tmp real 4m16.414s user 0m38.385s sys 0m31.874s I/O 2 MB/s time pvfs2-cp-r.pl WRF tmp Copying files from "WRF" to "tmp/WRF" using pvfs2-cp real 4m21.573s user 0m38.741s sys 0m32.293s I/O 1.96 MB/s time cp -rp WRF tmp Lots of 0 files (unreliable) real 7m21.473s user 0m0.100s sys 0m5.792s I/O 1.16 MB/s (2) pvfs2 -> local hard drive time pvfs2-cp-r.pl /pvfs2-dir/WRF /home/user Copying files from "/pvfs2-dir/WRF" to "/home/user/WRF" using pvfs2-cp real 1m19.311s user 0m19.008s sys 0m29.327s I/O 6.4 MB/s time pvfs2-cp-r /pvfs2-dir/WRF /home/user real 1m10.739s user 0m20.609s sys 0m30.021s I/O 7.25 MB/s time cp -rp /pvfs2-dir/WRF /home/user Lots of 0 files (unreliable) real 1m34.071s user 0m0.113s sys 0m3.906s I/O 5.45 MB/s (3) cp an nfs file to local disk 2057207616 t.dat time cp -p /nfs-dir/t.dat /home/usr/. real 2m55.894s user 0m0.257s sys 0m6.946s Read 11.7 MB/s Conclusion from this test: (1) pvfs2-cp-r is the fastest and cp -r is the slowest (2) it is slower to copy directory inside pvfs2 than to local disk (3) I/O pvfs2 is much slower than nfs !!! Any comments on the results?
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