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тАО05-21-2007 06:57 AM
тАО05-21-2007 06:57 AM
RP3440 vs. RP7420
So given the following:
(A) RP7420 with 5 x 900Mhz cores and 24GB allocated to a vPar running Oracle 9i database
vs.
(B) RP3440 with 4 x 1GHz cores and 24GB running Oracle 9i database
BOTH: dual A6795A 2Gbps FC adapters to a VA7110 disk array.
BOTH: system on AD188A U320 36GB 15K drive
BOTH: HP-UX 11.11
In production, the RP7420 rarely needs all 5 processors. The performance is usually constrained by I/O to the VA7110 array.
The $64M question:
Can I reasonably expect the RP3440 to perform to at least 80% of the RP7420's ability? Or even 90%?
thanks all...
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тАО05-21-2007 07:20 AM
тАО05-21-2007 07:20 AM
Re: RP3440 vs. RP7420
you said "5 cores", but I guess it must be 5 CPU modules = 10 cores.
The rp3440 has only a maximum of 2 modules = 4 cores.
Hm, 4 < 10, as you know.
So I guess you unlikely will get 90 %.
Next problem:
rp7420: 16 GB/s aggregate I/O slot bandwidth
vs.
rp3440: 2.5 GB/s aggregate I/O slot bandwidth (rp3440)
and another:
rp7420: 2 to 128 GB memory capacity
vs.
rp3440: 32 GB memory capacity
So I would try to compare "real" performance measures or ask the DB experts in the hp-ux forum next-door here on itrc.
Hope this helps!
Regards
Torsten.
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those who understand binary, and those who don't.
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тАО05-21-2007 07:34 AM
тАО05-21-2007 07:34 AM
Re: RP3440 vs. RP7420
And when I said 24GB memory I meant 24GB memory, period. Apples to apples. I don't care that the RP7420 can expand to 128GB - both are limited to 24GB for the purpose of this comparsion question.
Since my first post I have found that the peak memory bandwidth in the RP7420 is 16GB/s PER CELL BOARD (this RP7420 has two cell boards and other processors in another vPar). The RP3440 memory bandwidth is 8.5 GB/s. What I don't know is how much memory bandwidth might affect bottom-line performance.
And as for I/O bandwidth, I really only care about 1 PCI-X slot used for the 2Gbps FC card on the primary path to the VA7110. Even the lower-speed slots in the RP3440 can saturate a 2Gbps FC adapter. The fact that many more slots and much more I/O bandwidth are possible in the RP7420 - don't care. Apples to apples.
I will take the suggestion of posting in another forum, but I think in this forum, the question boils down to memory bandwidth. Anyone who wants to chime in with agree/disagree on that feel free!
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тАО05-21-2007 07:39 AM
тАО05-21-2007 07:39 AM
Re: RP3440 vs. RP7420
Hope this helps!
Regards
Torsten.
__________________________________________________
There are only 10 types of people in the world -
those who understand binary, and those who don't.
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No support by private messages. Please ask the forum!
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тАО05-21-2007 01:06 PM
тАО05-21-2007 01:06 PM
Re: RP3440 vs. RP7420
The rp3440 probably has lower latency. You could check that by running some lmbench tests.
If you are indeed usually bound by the one 2 Gig FC link to a VA7110 I'd bet that the rp3440 would remain the same.
Best thing to do of course is try to get some time in one of the capacity planning centers (now called Solutions Centers IIRC) and actually try-out your workload.
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тАО05-21-2007 01:10 PM
тАО05-21-2007 01:10 PM
Re: RP3440 vs. RP7420
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тАО05-21-2007 01:29 PM
тАО05-21-2007 01:29 PM
Re: RP3440 vs. RP7420
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тАО05-21-2007 01:44 PM
тАО05-21-2007 01:44 PM
Re: RP3440 vs. RP7420
Having said that, without knowing any details about your application it isn't possible to make a meaningful comparison between two different hardware platforms.
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тАО05-21-2007 01:58 PM
тАО05-21-2007 01:58 PM
Re: RP3440 vs. RP7420
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тАО05-21-2007 02:14 PM
тАО05-21-2007 02:14 PM
Re: RP3440 vs. RP7420
Since you seem to have some knowledgeof RP3440 architecture, is there a performance difference for populating 3 quads (to 24 GB) vs. 2 quads (to 32GB)? I would think 3 quads should increase the aggregate bandwidth. True/false?
Solution center is not an easy option. Short of putting together a system, transferring production to it, and telling our users to do their workload for a week, every attempt at quantifying an answer through simulation will be no more reliable than attempting an analytical answer.