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From: <mark.yagnatinsky@barclays.com>
To: <bug-grep@gnu.org>
Subject: grep perf docs barely mention mem usage
Thread-Topic: grep perf docs barely mention mem usage
Thread-Index: AdsaZptI/q2Vowy3QqC8Q11BlD+IJw==
Date: Wed, 9 Oct 2024 17:01:22 +0000
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This page: https://www.gnu.org/software/grep/manual/html_node/Performance=
.html
discusses how to get good performance out of grep.
That is nice, but the perf advice focuses almost entirely on speed.
I'm more interested in how to avoid excessive memory usage.
After a bit of research, it seems that once upon a time, grep used mmap w=
here possible, but it no longer does this.
Thus, peak memory usage will be proportional to the length of the longest=
=20line in the file.
Thus, if use the "-z multiline hack" to search across lines, grep will re=
ad the whole file into memory.
Thus, if I try this on a huge file, I will likely have a bad time.
(e.g., a 5 gig file would fail in a 32-bit grep, and would increase memor=
y pressure on the system on a 64-bit grep.)

Is the above about right?

This message is for information purposes only. It is not a recommendation=
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ml regarding our standard terms for Barclays Investment Bank where we tra=
de with you in principal-to-principal wholesale markets transactions; and=
=20in respect to Barclays Research, including disclosures relating to spe=
cific issuers, see: https://publicresearch.barclays.com.
_________________________________________________________________________=
_________=20
If you are incorporated or operating in Australia, read these important d=
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p:break-word">
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<p class=3D"MsoNormal">This page: <a href=3D"https://www.gnu.org/software=
/grep/manual/html_node/Performance.html">
https://www.gnu.org/software/grep/manual/html_node/Performance.html</a><o=
:p></o:p></p>
<p class=3D"MsoNormal">discusses how to get good performance out of grep.=
<o:p></o:p></p>
<p class=3D"MsoNormal">That is nice, but the perf advice focuses almost e=
ntirely on speed.<o:p></o:p></p>
<p class=3D"MsoNormal">I&#8217;m more interested in how to avoid excessiv=
e memory usage.<o:p></o:p></p>
<p class=3D"MsoNormal">After a bit of research, it seems that once upon a=
=20time, grep used mmap where possible, but it no longer does this.<o:p><=
/o:p></p>
<p class=3D"MsoNormal">Thus, peak memory usage will be proportional to th=
e length of the longest line in the file.<o:p></o:p></p>
<p class=3D"MsoNormal">Thus, if use the &#8220;-z multiline hack&#8221; t=
o search across lines, grep will read the whole file into memory.<o:p></o=
:p></p>
<p class=3D"MsoNormal">Thus, if I try this on a huge file, I will likely =
have a bad time.<o:p></o:p></p>
<p class=3D"MsoNormal">(e.g., a 5 gig file would fail in a 32-bit grep, a=
nd would increase memory pressure on the system on a 64-bit grep.)<o:p></=
o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Is the above about right?<o:p></o:p></p>
</div>

<P><SPAN lang=3DEN-US style=3D"mso-ansi-language: EN-US">This message is =
for=20
information purposes only. It is not a recommendation, advice, offer or=20
solicitation to buy or sell a product or service, nor an official confirm=
ation=20
of any transaction. It is directed at persons who are professionals and i=
s=20
intended for the recipient(s) only. It is not directed at retail customer=
s. This=20
message is subject to the terms at: <A=20
href=3D"https://www.ib.barclays/disclosures/web-and-email-disclaimer.html=
">https://www.ib.barclays/disclosures/web-and-email-disclaimer.html</A>. =

</SPAN></P>
<P><SPAN lang=3DEN-US style=3D"mso-ansi-language: EN-US">For important di=
sclosures,=20
please see: <A=20
href=3D"https://www.ib.barclays/disclosures/sales-and-trading-disclaimer.=
html">https://www.ib.barclays/disclosures/sales-and-trading-disclaimer.ht=
ml</A>=20
regarding marketing commentary from Barclays Sales and/or Trading desks, =
who are=20
active market participants; <A=20
href=3D"https://www.ib.barclays/disclosures/barclays-global-markets-discl=
osures.html">https://www.ib.barclays/disclosures/barclays-global-markets-=
disclosures.html</A>=20
regarding our standard terms for Barclays Investment Bank where we trade =
with=20
you in principal-to-principal wholesale markets transactions; and in resp=
ect to=20
Barclays Research, including disclosures relating to specific issuers, se=
e: <A=20
href=3D"https://publicresearch.barclays.com">https://publicresearch.barcl=
ays.com</A>.<BR>_________________________________________________________=
_________________________=20
<BR>If you are incorporated or operating in Australia, read these importa=
nt=20
disclosures: <A=20
href=3D"https://www.ib.barclays/disclosures/important-disclosures-asia-pa=
cific.html">https://www.ib.barclays/disclosures/important-disclosures-asi=
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href=3D"https://www.ib.barclays/disclosures/personal-information-use.html=
">https://www.ib.barclays/disclosures/personal-information-use.html</A>. =

<BR>_____________________________________________________________________=
_____________<BR></O:P></SPAN></P>
</body>
</html>

--_000_CH3PR12MB7619669931C7E52D378D01E0F97F2CH3PR12MB7619namp_--




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Subject: Re: bug#73721: grep perf docs barely mention mem usage
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On 2024-10-09 10:01, mark.yagnatinsky--- via Bug reports for GNU grep wrote:
> After a bit of research, it seems that once upon a time, grep used mmap where possible, but it no longer does this.
> Thus, peak memory usage will be proportional to the length of the longest line in the file.
> Thus, if use the "-z multiline hack" to search across lines, grep will read the whole file into memory.
> Thus, if I try this on a huge file, I will likely have a bad time.
> (e.g., a 5 gig file would fail in a 32-bit grep, and would increase memory pressure on the system on a 64-bit grep.)
> 
> Is the above about right?

Sounds right.

mmap likely wouldn't help much. As I recall, it typically made 'grep' 
slower.




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From: <mark.yagnatinsky@barclays.com>
To: <eggert@cs.ucla.edu>
Subject: RE: bug#73721: grep perf docs barely mention mem usage
Thread-Topic: bug#73721: grep perf docs barely mention mem usage
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Subject: Re: bug#73721: grep perf docs barely mention mem usage
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On 2024-10-09 14:12, mark.yagnatinsky@barclays.com wrote:
> With mmap(), the kernel just needs to set up a bit of book-keeping

Yes, I'm sure than in some cases mmap would be a win. However, all in 
all it was found not to be, and I expect that the hassle of maintaining 
the mmap variant wasn't worth whatever benefits it provided. As I recall 
'grep' wants to modify its input buffers for other efficiency reasons, 
and mmap CoW likely won't be a performance win over page-aligned read.

We could be proved wrong by someone taking the time to resurrect --mmap 
and doing performance measurements of realistic benchmarks. I don't have 
the time for that, myself.




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To: <eggert@cs.ucla.edu>
Subject: RE: bug#73721: grep perf docs barely mention mem usage
Thread-Topic: bug#73721: grep perf docs barely mention mem usage
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