+ Avar who knows a thing about pcre (I assume the regex compilation has impact on grep speed) On Thu, Oct 26, 2017 at 8:02 AM, Joe Perches <joe@xxxxxxxxxxx> wrote: > Comparing a cache warm git grep vs command line grep > shows significant differences in cpu & wall clock. > > Any ideas how to improve this? > > $ time git grep "\bseq_.*%p\W" | wc -l > 112 > > real 0m4.271s > user 0m15.520s > sys 0m0.395s > > $ time grep -r --include=*.[ch] "\bseq_.*%p\W" * | wc -l > 112 > > real 0m1.164s > user 0m0.847s > sys 0m0.314s > I wonder how much is algorithmic advantage vs coding/micro optimization that we can do.
