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Re: [HACKERS] [COMMITTERS] pgsql-server/src/template bsdi

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Jan Wieck <JanWieck(at)Yahoo(dot)com>
Cc: "Henry B(dot) Hotz" <hotz(at)jpl(dot)nasa(dot)gov>,Neil Conway <neilc(at)samurai(dot)com>,PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>,PostgreSQL-ports <pgsql-ports(at)postgresql(dot)org>
Subject: Re: [HACKERS] [COMMITTERS] pgsql-server/src/template bsdi
Date: 2003-10-09 19:05:28
Message-ID: 200310091905.h99J5St17732@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-committerspgsql-hackerspgsql-ports
Jan Wieck wrote:
> >> >My gcc 2.95.3 manual says:
> >> >
> >> >        -pipe  Use pipes rather than temporary files for  communi-
> >> >               cation  between  the various stages of compilation.
> >> >               This fails to work on some systems where the assem-
> >> >               bler cannot read from a pipe; but the GNU assembler
> >> >               has no trouble.
> >> >
> >> >so it looks like we can't use it on all platforms without testing.  I
> >> >will enable it for linux.  Do people want to test other platforms?
> >> 
> >> It should work on any platform that uses the GNU tools, so that means 
> >> *BSD is in the same boat as Linux.
> >> 
> >> Does it really speed compilation though?  I saw somewhere that it 
> >> didn't make much difference and might even hurt sometimes.
> > 
> > I saw a 5 second improvement with -pipe on a 150 second full compile of
> > PostgreSQL.  However, I have a MFS /tmp.  I suppose if I didn't, it
> > would be slower.  However, the difference is so small as to be
> > meaningless.  Can someone else test on another *BSD and report?
> > 
> 
> Also, IIRC you have a dual processor box. In that case using -pipe helps 
> to utilize 2 CPU's (not much though), whereas on a single CPU system it 
> forces extra context switches that aren't necessary when running the 
> stages sequential.

Oh, OK. I am on a dual, so maybe that's why I see an improvement.  If I
can get another BSD guy to test this, I can remove the pipe for all the
BSD's.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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