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

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

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