Title: Re: [PERFORM] 64-bit vs 32-bit performance ... backwards?
Opteron is ~20% faster at executing code in 64-bit mode than 32-bit because of the extra registers made available with their 64-bit mode:
http://www.tomshardware.com/2003/04/22/duel_of_the_titans/page7.html
Doubling the GPRs from 8 to 16 has generally made a 20%-30% difference in CPU-bound work:
http://www.tomshardware.com/2003/04/22/duel_of_the_titans/page18.html
If the task is memory bandwidth bound, there should be an advantage to using less memory for the same task, but if the database is using types that are the same width for either execution mode, you wouldn't expect a significant difference just from wider pointer arithmetic.
- Luke
- [PERFORM] 64-bit vs 32-bit performance ... backwards? Anthony Presley
- Re: [PERFORM] 64-bit vs 32-bit performance ... b... Josh Berkus
- Re: [PERFORM] 64-bit vs 32-bit performance ... b... David Boreham
- Re: [PERFORM] 64-bit vs 32-bit performance ... b... Steve Atkins
- Re: [PERFORM] 64-bit vs 32-bit performance .... Joshua D. Drake
- Re: [PERFORM] 64-bit vs 32-bit performan... Steve Atkins
- Re: [PERFORM] 64-bit vs 32-bit perfo... Luke Lonergan
- Re: [PERFORM] 64-bit vs 32-bit perfo... Alex Turner
- Re: [PERFORM] 64-bit vs 32-bit ... Tom Lane
- Re: [PERFORM] 64-bit vs 32-... David Wheeler
- [PERFORM] Placement of 64-b... Steinar H. Gunderson
- Re: [PERFORM] Placement... Stephen Frost
- Re: [PERFORM] 64-bit vs 32-bit ... Christopher Browne
- Re: [PERFORM] 64-bit vs 32-bit ... Leigh Dyer
- Re: [PERFORM] 64-bit vs 32-... Josh Berkus
- Re: [PERFORM] 64-bit vs... Andreas Pflug
- Re: [PERFORM] 64-bit vs 32-bit ... PFC