Thanks for the analysis. I have removed mention of the -fast option from the Solaris FAQ.
--------------------------------------------------------------------------- Kenneth Marshall wrote: > On Wed, Sep 27, 2006 at 04:09:18PM +0200, Zdenek Kotala wrote: > > Tom Lane napsal(a): > > >Zdenek Kotala <[EMAIL PROTECTED]> writes: > > >>The problem was generated, because -fast option was set only for the > > >>compiler and not for the linker. Linker takes wrong version of > > >>libraries. If -fast is set for both then horology test is OK, but > > >>question was if float optimalization should generate some problems. > > > > > >So FAQ_Solaris needs to tell people to put -fast in both CFLAGS and > > >LDFLAGS? > > > > Exactly, but I want to sure, that float optimalization is safe and > > should be applied for postgres, because -fast breaks IEE754 standard. If > > it is OK I will adjust FAQ_Solaris. > > > > Zdenek > > > Unless the packager understands the floating point usage of every > piece and module included and the effect that the -fast option will > have on them, please do not recommend it for anything but extremely > well tested dedicated use-cases. When it causes problems, it can > be terrible if the problems are not detected immediately. Massive > data corruption could occur. > > Given these caveats, in a well tested use-case the -fast option can > squeeze a bit more from the CPU and could be used. I have had to > debug the fallout from the -fast option in other software in the > past. Let's just say, backups are a good thing. > > I would vote not to recommend it without very strong cautions similar > to was Sun includes in the compiler manual pages. > > Ken > > > ---------------------------(end of broadcast)--------------------------- > TIP 3: Have you checked our extensive FAQ? > > http://www.postgresql.org/docs/faq -- Bruce Momjian [EMAIL PROTECTED] EnterpriseDB http://www.enterprisedb.com + If your life is a hard drive, Christ can be your backup. + ---------------------------(end of broadcast)--------------------------- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
