gcc build / test times on multi-core hosts?

[Joern RENNECKE]

Andrew Haley wrote:

> 
>As a comparison point, I get
>
>real    73m39.275s
>user    113m19.549s
>sys     15m26.010s
>
>for the bootstrap: that's 1h14 elapsed time.  That's on a "AMD
>Athlon(tm) 64 X2 Dual Core Processor 4800+" (2.4 GHz) with make -j3.
>That's 129min of CPU time in 74min of elapsed time, a pretty good
>processor utilization ratio of 1.75 : 2.
>  
>
Is that using the i686 or amd64 instruction set?  If the latter, does it 
use 32 or 64 bit pointers?
How much RAM dos this machine have, and how fast is it?

Has anybody any figures what impact the choice of CAS 2 / CAS 2.5 / CAS3 
NON-ECC / ECC
memory has on system performance when doing gcc builds / regression tests?