Hi Joe, the general rule on Solaris SPARC is: - if you need to address a big size of memory (over 4G): compile in 64bit - otherwise: compile in 32bit ;-)
It's true that 32bit code will run faster comparing to 64bit ont the 64bit SPARC - you'll operate with 2 times shorter addresses, and in some cases SPARC will be able to execute 2 operations in parallel on 32bit code, while it'll be still one operation on 64bit code.. - But it's all about the code, because once you start to do I/O requests all kind of optimization on the instructions will be lost due I/O latency ;-)) So, as usual, a real answer in each case may be obtained only by a real test.. Just test both versions and you'll see yourself what is a valid in your case :-)) Same problem regarding compilers: in some cases GCC4 will give a better result, in some cases Sun Studio will be better (there are many posts in blogs about optimal compiler options to use).. - don't hesitate to try and don't forget to share here with others :-)) Rgds, -Dimitri On 8/11/10, Joseph Conway <m...@joeconway.com> wrote: > With a 16 CPU, 32 GB Solaris Sparc server, is there any conceivable > reason to use a 32 bit build rather than a 64 bit build? Apparently the > Sun PostgreSQL package includes a README that indicates you might want > to think twice about using 64 bit because it is slower -- this seems > like outdated advice, but I was looking for confirmation one way or the > other. > > Also semi-related question: when building from source, using gcc, > enabling debug (but *not* assert) is normally not much of a performance > hit. Is the same true if you build with the Sun CC? > > Thanks in advance for any thoughts/experiences. > > Joe > > > > -- > Joe Conway > credativ LLC: http://www.credativ.us > Linux, PostgreSQL, and general Open Source > Training, Service, Consulting, & 24x7 Support > > > -- > Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-performance > -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
