Comments (3)
GNU grep can tell that its output is redirected to /dev/null
and because of that it exits after the first match. (It still needs to use the exit code to report whether there was a match at all, but that's it.) If you send the output through cat
then it cannot perform that optimization and ends up slightly slower than ripgrep:
$ hyperfine 'rg system rockyou.txt | cat' 'grep system rockyou.txt | cat'
Benchmark #1: rg system rockyou.txt | cat
Time (mean ± σ): 50.4 ms ± 10.8 ms [User: 37.6 ms, System: 14.2 ms]
Range (min … max): 43.0 ms … 84.6 ms 34 runs
Benchmark #2: grep system rockyou.txt | cat
Time (mean ± σ): 71.8 ms ± 13.3 ms [User: 54.3 ms, System: 18.9 ms]
Range (min … max): 60.4 ms … 97.5 ms 36 runs
Summary
'rg system rockyou.txt | cat' ran
1.42 ± 0.40 times faster than 'grep system rockyou.txt | cat'
from ripgrep.
Interesting, thanks for the explanation! Seems like I never looked at the execution time when getting an output...
from ripgrep.
Yeah @blyxxyz has it right. For hyperfine specifically, you can pass --output=pipe
instead of adding | cat
.
I have specifically avoided the "detect /dev/null
and automatically enable -q/--quiet
" optimization that GNU grep does. ripgrep could do it. It isn't hard to do. It just always seemed a little weird to me.
For simple literal searches like this, ripgrep should pretty much always be faster. ripgrep's substring search should be very nearly strictly superior to GNU grep's. If you can find a non-pathological case where GNU grep is noticeably faster (on x86-64 or aarch64) for real, I'd love to see it.
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Related Issues (20)
- cursor disappearing HOT 1
- failing test: f2361_sort_nested_files
- The same `LineTerminator` is being used for searching and printing
- `--pre` doesn't work on Windows (CMD, MSYS2 bash, Powershell) HOT 16
- ARMv8 release binary for RPI 5 HOT 2
- ripgrep 14.1.0 exit silently when stdin is not connected (GNU parallel without --tty) HOT 8
- Feature Request: search for binary data by supplying a hex string HOT 9
- Is it possible to add a search for just a set of directories as a type? HOT 1
- Allow following symlinks to files HOT 2
- WalkDir ignores files that are in .gitignore outside of current git repository HOT 2
- Multiple quirks in ignore behavior HOT 1
- BUG: exit code on windows not stable (wrong on first run, then stable), seems to leak HOT 9
- pcre2 reset match \K drops submatches HOT 1
- ripgrep is slower than LTREP matching `[A-Z][A-Z]+` HOT 3
- --files is listing files that won't be searched into HOT 4
- ripgrep ignore files inside `.github` folder HOT 5
- Potentially incorrect or undocumented .gitignore files handling
- `--text` flag only works if it's late in the command HOT 1
- Ripgrep parsing files in gitignore HOT 1
- Searching disk images for a text regex causes rg to be SIGKILL'd HOT 8
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