I'm doing some serious comparison to decide what to
do with some old USIII 900 servers.
What do you mean by the 900? 900MHz US-III - you
quite 750MHz below.
We have on production several servers using USIII 900Mhz and 1200Mhz
and seriously thinking on replacing them with Opterons.
I've reported some tests done on my old Blade1000 with USIII 750Mhz.
gino$ time ./doit
ptime(1m) is supposed to be more reproducable, but
does not time child processes (are there
any?) of the command;
no, single process.
Is that possible?? a USIII 750 faster than a Xeon
2.4Ghz??
Could that be related to cache size?
Yes, or any number of other things. Even the old
sparc processors have bigger l2 caches
than all but the very latest x86 cpus. The caches
are different not just in size
but in architecture - where misses are filled to,
indexing, cacheline size, associativity etc
and it looks like the combination on the USIII 750MHz
*may* have suited this app very nicely.
But you also need to consider other factors such as
system memory size. Was it the
same OS version used in each case?
Same OS. All systems used in my tests are with 4GB or 8GB memory
and only doing my test.
Also I've seen that Opteron 4CPU boxes are going
slow when there are a lot of process runnning ...
That's never been my experience.
Also other sysadmin I know found the same when switched from Sparc to Opteron...
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