Desktops usually no; Servers yes.
Posted Dec 10, 2004 12:17 UTC (Fri) by evgeny
In reply to: Desktops usually no; Servers yes.
Parent article: Fedora Core 3 on AMD64
> Does 64bit really help for doubles?
Well, at least for my codes it does. YMMV ;-)
> I thought that FPU's on current 32bit processors handled 80 bits or so.
P3 is not bad, and Centrino is even better (per GHz). But you can't get SMP boxes with Centrino, and CPU speed is not high. P4/Xeon4, on the other hand, is a complete disaster as far as doubles and longlongs are concerned - again, this is my experience. Try running md5sum on a large file (e.g. an iso image) on a P3, P4, and Opteron boxes (of course, with 64bit kernel and md5sum binary in the last case) - and compare the (user) times. I even tried the Intel's ICC compiler - all the same. Switching from x86 to amd64 got me a factor of ~2 (per GHz) comparing to P3 and ~4 (!) comparing to P4.
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