RE: [EXT] Re: possible grep V3.7 issue

[Gordon Grimes <Gordon.Grimes@nortonlifelock.com>]

Thanks Elliot.

Yeah, I suspected this wasn't 100% reproducible or else it'd have been reported/addressed by now.  As you say, perhaps there's some idiosyncrasy with my system/setup.  If there's a wave of reporting a similar issue then perhaps it's worth a look (e.g. perhaps a recent MS update triggered this).  Anyway, unless/until that happens, I'll simply stick with V3.6. 

Thanks for taking a look.
-g-

-----Original Message-----
From: Eliot Moss <moss@cs.umass.edu> 
Sent: Monday, June 6, 2022 8:34 AM
To: Gordon Grimes <Gordon.Grimes@nortonlifelock.com>; cygwin@cygwin.com
Subject: [EXT] Re: possible grep V3.7 issue

On 6/6/2022 8:26 AM, Gordon Grimes via Cygwin wrote:
> Hi,
> 
> I wanted to let you know about a possible issue I found in grep v3.7.  I run Cygwin and recently downgraded ‘grep’ to v3.6 from v3.7 to address a performance issue (shown below).
> I just thought you’d want to know  (V3.6 is working well, so I’m in a 
> good place 😊 ) Enjoy,
> -g-
> 
> 
> % time echo hi | grep h
> hi
> 
> real        0m7.442s
> user       0m0.030s
> sys          0m6.576s
> 
> % /usr/bin/grep --version
> grep (GNU grep) 3.7
> Packaged by Cygwin (3.7-2)
> Copyright (C) 2021 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgnu.org%2Flicenses%2Fgpl.html&amp;data=05%7C01%7CGordon.Grimes%40nortonlifelock.com%7C640f66e158104f7486ea08da47b8e328%7C94986b1d466f4fc0ab4b5c725603deab%7C0%7C0%7C637901156666044572%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=FujGNPbnS6TMO8I1RT%2FuczWHhImX6KnEUnLWC5EYYTE%3D&amp;reserved=0.
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.
> 
> Written by Mike Haertel and others; see 
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.sv.gnu.org%2Fcgit%2Fgrep.git%2Ftree%2FAUTHORS&amp;data=05%7C01%7CGordon.Grimes%40nortonlifelock.com%7C640f66e158104f7486ea08da47b8e328%7C94986b1d466f4fc0ab4b5c725603deab%7C0%7C0%7C637901156666044572%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=yXCYAppkPpbDwkD1h2BPA%2B5PPE6QYLRvmVHxvUwxP34%3D&amp;reserved=0.
> 
> After the downgrade…
> 
> % time echo hi | grep h
> hi
> 
> real        0m0.292s
> user       0m0.015s
> sys          0m0.124s

I'm running 3.7-2 and get timing similar to what you give for 3.6:

real    0m0.167s
user    0m0.015s
sys     0m0.061s

Not sure what to say unless, if I downgraded, it would be an order of magnitude faster ...

I wonder if maybe the new version triggers some anti-virus activity or something like that.

Eliot Moss