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File manager nnn takes half the time taken by ls to list
source link: https://www.tuicool.com/articles/hit/RzaE7nv
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COMPARISON
Stripped binary (or script) size and memory usage of nnn
and some other popular FMs (which existed before nnn
) while viewing a directory with 13.5K files (0 directories), sorted by size/du:
<b>BINSZ</b> VIRT <b> RES</b> SHR S %MEM COMMAND <b> 650K</b> 139720 <b>91220</b> 8460 S 1.1 ranger <b> 1M</b> 50496 <b>15328</b> 4076 S 0.2 vifm <b> 1M</b> 72152 <b>12468</b> 7336 S 0.2 mc <b> 55K</b> 15740 <b> 4348</b> 2460 S 0.1 nnn -S
NNN VS. LS
In a sample one-shot run, nnn
took less than 50% time to list a directory with 2083 files:
$ time nnn /usr/bin 0.00user 0.04system 0:00.04elapsed 97%CPU (0avgtext+0avgdata 3588maxresident)k 0inputs+0outputs (0major+544minor)pagefaults 0swaps $ time ls -l /usr/bin 0.02user 0.08system 0:00.09elapsed 117%CPU (0avgtext+0avgdata 3696maxresident)k 0inputs+0outputs (0major+527minor)pagefaults 0swaps
OPTIMIZATION
nnn
uses highly optimized algorithms. Some of the significant factors are listed below:
O3 -Wall -Wextra -Werror
However, we had been most careful not to obfuscate the code. It's reasonably well-documented too!
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