Re: Anybody Home? (DS20 needs CPU+RAM)

Il Wed, 23 Aug 2006 16:20:12 +0200, whygee ha scritto:
not sure.
1) the external cache is larger on "servers" than "desktops",
i think it's 2MB vs 1MB. Makes a difference.
1,5) the EV6 has a separate L2 bus, so it's different.
2) the "speed" is roughly the same, the XP900 is 466MHz
and i've seen 4100s with 533MHz. But it's not a good comparison.
3) a friend has a 3CPU AS4100 (big beast, to say the least).
the agregated memory bandwidth (despite older memory technology)
is larger than a single-CPU EV6.

Mine is a 4x466 4MB L2 each
But when I misured memory bandwidth with hdparm, I only found 140MB/s or
so.
Maybe I'm recalling wrong, maybe hdparm is not the best test for memory
bandwidth, but the P4 3000 I'm writing from does 1174.47MB/s
I will test the AS4100 bandwidth again tonight.
Could you tell me how is the performance of XP900 memory measured by
hdparm?

I use and like the Alphas because i can do "heavy" works
that are painful to optimise for x86. 32 64-bit registers
are a blessing for some of my applications. x86-64 does not
even address this issue (there are 15 usable registers).

I thought that two of the 32 registers were special purpose, zero and
null, if I'm not wrong. In this case they are 30, but still double the x86
registers!
So you are developing on alpha for business customers?
What kind of applications?

I always wanted to start some development with alpha assembly, but never
found the time for.
Last week I printed the whole "Alpha Assembly language guide" to start
studying. Do you know some good tutorial or book available from the
internet that could help?

ciao!
gl
.

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