/lf-sys-cp

Primary LanguageCMIT LicenseMIT

  1. Compile lfcp.c and syscp.c

    $ cmake .
$ make

  2. Create a 512MB file test

    $ fallocate -l 512M test
$ stat test
  File: test
  Size: 536870912       Blocks: 1048584    IO Block: 4096   regular file
Device: 820h/2080d      Inode: 39517       Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/     xqm)   Gid: ( 1000/     xqm)
Access: 2022-11-30 13:36:02.502376982 +0800
Modify: 2022-11-30 13:36:02.502376982 +0800
Change: 2022-11-30 13:36:02.502376982 +0800
 Birth: -

  3. Compare syscp[BUFFSIZE=1024], lfcp and cp

    $ time ./lfcp test test.lfcp
real    0m7.463s
user    0m4.788s
sys     0m2.659s
$ time ./syscp test test.syscp
syscp[1024]: Copying...

real    0m1.249s
user    0m0.050s
sys     0m1.195s
$ time cp test test.cp
real    0m0.468s
user    0m0.000s
sys     0m0.459s
$ rm -f test.* # Remove all test copies

  4. Compare syscp[BUFFSIZE=16,128,1024,4096,16384]

    $ cmake -DBUFFSIZE=16 . # BUFFSIZE=16
$ make syscp
$ time ./syscp test test.syscp16
syscp[16]: Copying...

real    0m57.522s
user    0m2.290s
sys     0m55.217s
$ cmake -DBUFFSIZE=128 . # BUFFSIZE=128
$ make syscp
$ time ./syscp test test.syscp128
syscp[128]: Copying...

real    0m7.525s
user    0m0.319s
sys     0m7.188
$ cmake -DBUFFSIZE=1024 . # BUFFSIZE=1024
$ make syscp
$ time ./syscp test test.syscp1024
syscp[1024]: Copying...

real    0m1.157s
user    0m0.080s
sys     0m1.077s
$ cmake -DBUFFSIZE=4096 . # BUFFSIZE=4096
$ make syscp
$ time ./syscp test test.syscp4096
syscp[4096]: Copying...

real    0m0.486s
user    0m0.020s
sys     0m0.465s
$ cmake -DBUFFSIZE=16384 . # BUFFSIZE=16384
$ make syscp
$ time ./syscp test test.syscp16384
syscp[16384]: Copying...

real    0m0.434s
user    0m0.010s
sys     0m0.415s