Date: Wed, 22 Jun 2005 09:46:11 +0100 From: "Harrison Peter CSA BIRKENHEAD" <peter.harrison@dwp.gsi.gov.uk> To: "Chuck Swiger" <cswiger@mac.com> Cc: freebsd-questions@freebsd.org Subject: RE: -DNOPROFILE with make buildworld... Message-ID: <D8E3EB52364A0842A853E0944FD390D93176DE@DMM00022.link2.gpn.gov.uk>
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>=20-----Original=20Message----- >=20From:=20Chuck=20Swiger=20[mailto:cswiger@mac.com] >=20Sent:=2021=20June=202005=2019:25 >=20To:=20Roland=20Smith >=20Cc:=20Harrison=20Peter=20CSA=20BIRKENHEAD;=20freebsd-questions@freebsd= .org >=20Subject:=20Re:=20-DNOPROFILE=20with=20make=20buildworld... [snip] =20 >=20Normally,=20you=20don't=20use=20the=20profiled=20versions=20of=20libra= ries=20 >=20unless=20you=20are=20 >=20running=20a=20binary=20which=20links=20against=20them.=20=20If=20you=20= are=20 >=20running=20a=20binary=20which=20 >=20has=20not=20been=20compiled=20with=20profiling,=20the=20toolchain=20wi= ll=20link=20 >=20it=20against=20normal=20 >=20versions=20of=20the=20libraries. Most=20of=20the=20apps=20I'm=20running=20have=20been=20compiled=20from=20p= orts=20against=20the=20stock=205.3-RELEASE=20libraries.=20Are=20the=20stoc= k=20libraries=20profiling=20or=20not?=20Would=20I=20have=20had=20to=20expl= icitly=20set=20an=20option=20to=20compile=20ports=20to=20link=20against=20= profiling=20libraries?=20Is=20it=20therefore=20a=20reasonable=20assumption= =20that=20if=20I=20didn't=20specifically=20make=20any=20binaries=20profili= ng,=20then=20they'll=20be=20not-profiling? >=20 >=20[=20...=20] >=20>=20Programs=20that=20have=20been=20compiled=20with=20profiling=20enab= led=20might=20run >=20>=20fractionally=20slower=20that=20without.=20But=20I=20doubt=20the=20= difference=20is >=20>=20significant=20on=20a=20modern=20machine.=20 >=20 >=20The=20amount=20of=20overhead=20seems=20to=20vary=20by=20platform,=20bu= t=20it's=20 >=20generally=20only=20a=20 >=20couple=20of=20percent.=20=20Not=20very=20significant,=20but=20maybe=20= noticable. >=20 >=20The=20major=20downsides=20to=20having=20profiled=20libraries=20around=20= is=20 >=20that=20they=20use=20more=20 >=20disk=20space=20than=20normal=20versions,=20and=20it=20takes=20longer=20= to=20do=20a=20 >=20buildworld,=20but=20 >=20the=20runtime=20performance=20of=20the=20system=20for=20normal=20binar= ies=20 >=20will=20not=20be=20affected. I=20can=20live=20with=20that=20kind=20of=20performance=20overhead,=20but=20= disk=20space=20is=20more=20of=20an=20issue=20for=20me. >=20 >=20>=20I'll=20be=20bold=20and=20say=20that=20modern=20machines=20are=20so= =20fast=20that=20there=20is >=20>=20seldom=20need=20to=20profile=20a=20program. >=20 >=20Even=20people=20who=20write=20code=20on=20fast=20machines=20may=20run=20= that=20code=20 >=20on=20slower=20boxes=20 >=20sometime.=20=20However,=20what=20you've=20said=20is=20still=20true:=20= there=20is=20 >=20seldom=20need=20to=20 >=20profile=20a=20program.=20=20Get=20it=20working=20well=20enough=20that=20= it=20 >=20doesn't=20leak=20memory,=20and=20 >=20then=20worry=20about=20profiling=20it.=20=20:-) > Indeed.=20Once=20I've=20successfully=20upgraded=20my=20Athlon=20XP=201800+= =20desktop=20to=205.4=20I'm=20intending=20to=20set=20up=20NFS=20shares=20a= nd=20upgrade=20my=20Thinkpad=20600e=20which=20is=20also=20on=205.3=20(and=20= I=20don't=20fancy=20building=20world=20on=20it's=20P2=20366). >=20--=20 >=20-Chuck Thanks=20for=20the=20advice. Peter=20Harrison >=20 >=20 >=20PLEASE=20NOTE:=20THE=20ABOVE=20MESSAGE=20WAS=20RECEIVED=20FROM=20THE=20= INTERNET. >=20=20 >=20On=20entering=20the=20GSi,=20this=20email=20was=20scanned=20for=20viru= ses=20by=20 >=20the=20Government=20Secure=20Intranet=20(GSi)=20virus=20scanning=20serv= ice=20 >=20supplied=20exclusively=20by=20Energis=20in=20partnership=20with=20Mess= ageLabs. >=20=20 >=20Please=20see=20 http://www.gsi.gov.uk/main/notices/information/gsi-003-2002.pdf=20for=20fu= rther=20details. In=20case=20of=20problems,=20please=20call=20your=20organisational=20IT=20= helpdesk ----------------------------------------------------------------------- This=20document=20is=20strictly=20confidential=20and=20is=20intended=20onl= y=20for=20use=20by=20the=20addressee.=20 If=20you=20are=20not=20the=20intended=20recipient,=20any=20disclosure,=20c= opying,=20distribution=20or=20other=20 action=20taken=20in=20reliance=20of=20the=20information=20contained=20in=20= this=20e-mail=20is=20strictly=20prohibited. Any=20views=20expressed=20by=20the=20sender=20of=20this=20message=20are=20= not=20necessarily=20those=20of=20the=20Department=20 for=20Work=20and=20Pensions. If=20you=20have=20received=20this=20transmission=20in=20error,=20please=20= use=20the=20reply=20function=20to=20tell=20us=20 and=20then=20permanently=20delete=20what=20you=20have=20received. Please=20note:=20Incoming=20and=20outgoing=20e-mail=20messages=20are=20rou= tinely=20monitored=20for=20compliance=20 with=20our=20policy=20on=20the=20use=20of=20electronic=20communications.=20= The=20original=20of=20this=20email=20was=20scanned=20for=20viruses=20by=20= the=20Government=20Secure=20Intranet=20(GSi)=20virus=20scanning=20service=20= supplied=20exclusively=20by=20Energis=20in=20partnership=20with=20MessageL= abs. On=20leaving=20the=20GSi=20this=20email=20was=20certified=20virus-free
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