https://github.com/ggreer/the_silver_searcher#how-is-it-so-fast
尝试了下，比ack快多了，完虐grep当然更是毫无压力。
安装后用法和ack类似，ag xxx即可
How is it so fast?
Searching for literals (no regex) uses Boyer-Moore-Horspool strstr.
Files are mmap()ed instead of read into a buffer.
If you're building with PCRE 8.21 or greater, regex searches use the JIT compiler.
Ag calls pcre_study() before executing the regex on a jillion files.
Instead of calling fnmatch() on every pattern in your ignore files, non-regex patterns are loaded into an array and binary searched.
Ag uses Pthreads to take advantage of multiple CPU cores and search files in parallel.
尝试了下，比ack快多了，完虐grep当然更是毫无压力。
安装后用法和ack类似，ag xxx即可
How is it so fast?
Searching for literals (no regex) uses Boyer-Moore-Horspool strstr.
Files are mmap()ed instead of read into a buffer.
If you're building with PCRE 8.21 or greater, regex searches use the JIT compiler.
Ag calls pcre_study() before executing the regex on a jillion files.
Instead of calling fnmatch() on every pattern in your ignore files, non-regex patterns are loaded into an array and binary searched.
Ag uses Pthreads to take advantage of multiple CPU cores and search files in parallel.
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