Обсуждение: Re: [COMMITTERS] pgsql-server/src/template bsdi freebsd netbsd ...
Neil Conway wrote:
> On Thu, 2003-10-09 at 09:35, Bruce Momjian wrote:
> > I only put back what was already there --- not sure why others don't use
> > it. You want it enabled on Linux?
>
> Well, why do we have it enabled at all? If it's to speed compilation, we
> may as well enable it on other platforms where -pipe works, of which
> Linux is one.
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?
--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
Bruce Momjian writes: > > Well, why do we have it enabled at all? If it's to speed compilation, we > > may as well enable it on other platforms where -pipe works, of which > > Linux is one. On my (Linux) system, no -pipe is always faster than -pipe. > 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? I request the change for Linux to be reverted. -- Peter Eisentraut peter_e@gmx.net
Peter Eisentraut wrote: > Bruce Momjian writes: > > > > Well, why do we have it enabled at all? If it's to speed compilation, we > > > may as well enable it on other platforms where -pipe works, of which > > > Linux is one. > > On my (Linux) system, no -pipe is always faster than -pipe. > > > 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? > > I request the change for Linux to be reverted. Done. Let me test BSD/OS now that you mention it. :-) -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073
At 10:45 AM -0400 10/9/03, Bruce Momjian wrote: >Neil Conway wrote: >> On Thu, 2003-10-09 at 09:35, Bruce Momjian wrote: >> > I only put back what was already there --- not sure why others don't use >> > it. You want it enabled on Linux? >> >> Well, why do we have it enabled at all? If it's to speed compilation, we >> may as well enable it on other platforms where -pipe works, of which >> Linux is one. > >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. -- The opinions expressed in this message are mine, not those of Caltech, JPL, NASA, or the US Government. Henry.B.Hotz@jpl.nasa.gov, or hbhotz@oxy.edu
Henry B. Hotz wrote: > >> Well, why do we have it enabled at all? If it's to speed compilation, we > >> may as well enable it on other platforms where -pipe works, of which > >> Linux is one. > > > >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? -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073
Bruce Momjian wrote: > Henry B. Hotz wrote: >> >> Well, why do we have it enabled at all? If it's to speed compilation, we >> >> may as well enable it on other platforms where -pipe works, of which >> >> Linux is one. >> > >> >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. Jan -- #======================================================================# # It's easier to get forgiveness for being wrong than for being right. # # Let's break this rule - forgive me. # #================================================== JanWieck@Yahoo.com #
On Fri, 10 Oct 2003 12:45 am, Bruce Momjian wrote: > My gcc 2.95.3 manual says: > > -pipe Use pipes rather than temporary files for communi- > [snip] > 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? I saw your message that it was disabled for all builds (I assume you meant "all", not "all BSDs"), but for the sake of completeness: $ uname -a OSF1 hostname V4.0 1229 alpha $ cc -pipe main.c ld: -pipe: Unknown flag ld: Usage: ld [options] file [...] $ gcc -pipe main.c as: Error: no source, object or ucode file specified main.c:46: output pipe has been closed Regards, Philip Yarra.