Linux?????????????????????????
???????????? ???????[ 2013/6/14 10:54:12 ] ????????
???????????
?????????????????????????????????μ?????????????????????????http://www.quora.com/How-can-someone-rapidly-delete-400-000-files???Zhenyu Lee??
????????????find ?? xargs???????д??????????rsync???????????rsync –delete?????????????????????????滻?????????????????????????????????????????Lee???????????????????????????????
??????????
?????? CPU??Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz
?????? MEM??4G
?????? HD??ST3250318AS??250G/7200RPM
??????? –delete ?? –exclude?????????????????????????????????????????????????????????????????????????????????????
???????2???
???????????Keith-Winstein????Quora????????????????????????????????????????????????á????????£???Щ????????????????????????????????????????????????п???????Щ?????????????????????Щ?????????????ū?????μ??????????????????Ρ?????????/usr/bin/time???????????????????????????μ?????
????????ζ???1000000??????????????????????0????
?????????
# method 1
~/test $ /usr/bin/time -v rsync -a --delete empty/ a/
Command being timed: "rsync -a --delete empty/ a/"
User time (seconds): 1.31
System time (seconds): 10.60
Percent of CPU this job got: 95%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0:12.42
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 0
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 24378
Voluntary context switches: 106
Involuntary context switches: 22
Swaps: 0
File system inputs: 0
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
# method 2
Command being timed: "find b/ -type f -delete"
User time (seconds): 0.41
System time (seconds): 14.46
Percent of CPU this job got: 52%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0:28.51
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 0
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 11749
Voluntary context switches: 14849
Involuntary context switches: 11
Swaps: 0
File system inputs: 0
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
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