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Forums - PC Discussion - 2Ghz AMD Jaguar Benchmarks

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zarx on 23 April 2013
ethomaz said:
zarx said:
Those are some odd points of comparison tho I mean a 5 year old single core Atom CPU, a 2 year old low end dual core i3, an 2 year old Cortex A9 based CPU. I mean most of those have long been discontinued.

There is a i7 in the result and some others processors but none "similar" to four-core Jaguar... I tried to get the most close to what Jaguar is... for example there are just 4 PPC processors listed and just one with more than one core.


Be that as it may these results are pretty meaningless without contemporary points of comparison.



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walsufnir on 23 April 2013
ethomaz said:
I don't know if you think that interesting but AMD released two days ago the Optimization Manual for Jaguar: http://support.amd.com/us/Processor_TechDocs/52128_16h_Software_Opt_Guide.zip


It is interesting but also available for other cpus, of course. It explains inner details of the architecture which can be useful if you are a maintainer of gcc ;) This is typical CPU-specific code addressing. How many cycles does a multiply cost and such things. Sadly this is used very rare but highly gifted coders can make use of this information by debugging/profiling and squeeze out the last bit of performance out of a cpu.

Still interesting, of course ;)



ethomaz on 23 April 2013

For these that want to use the result table to find some processor...

1. Open this link: https://www.osadl.org/CPUs-under-test.qa-farm-cpus.0.html
2. Choose the Arch, Cores, etc... click in the link to see more info about the processor (eg. rack1slot3 = AMD Athlon(tm) 64 Processor 2800+)
3. With the rack and slot number converst to the box search term (eg. rack1slot3 = r1s3)
4. Open this link: https://www.osadl.org/CPU-benchmarks.qa-farm-cpu-benchmarks.0.html
5. Search the box term (eg. r1s3)... so you have the results

* The first table is Single-core results... the secont Multi-core results
* The results in gray in the Multi-core part are from single-core processors (not valid)



Pemalite on 24 April 2013

What the results tell us is that Jaguar is following in the footsteps of Trinity and Zambezi. - Aka. Strong integer performance.

However, due to the lack of floating point numbers, I'm assuming it's also going to have the same issue as Trinity and Zambezi, aka. Weak floating point, which makes sense they probably went with the "module" design where 2 cores probably share a floating point unit.
Which isn't as bad as it seems, GPU's are far better suited to floating point anyway, it also helps keep complexity and thus costs down too.

Are you able to pull up any numbers for the AMD E-350/E-450? It would give me an idea how much Jaguar improves over it's older counterpart. (I'm unable to access those links for myself.)



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drkohler on 24 April 2013
Pemalite said:


However, due to the lack of floating point numbers, I'm assuming it's also going to have the same issue as Trinity and Zambezi, aka. Weak floating point, which makes sense they probably went with the "module" design where 2 cores probably share a floating point unit.

There is a die shot picture floating around on the net of a 4core Jaguar. Each core has its own fpu.



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Pemalite on 24 April 2013
drkohler said:
Pemalite said:


However, due to the lack of floating point numbers, I'm assuming it's also going to have the same issue as Trinity and Zambezi, aka. Weak floating point, which makes sense they probably went with the "module" design where 2 cores probably share a floating point unit.

There is a die shot picture floating around on the net of a 4core Jaguar. Each core has its own fpu.

You're right. Did allot of reading.
Jaguar doesn't go with a module design, which saves the floating point issue.

Also interesting is how it supports AVX instructions too, AMD really wen't all-out on the features this processor can do, Intel is going to have a big task on matching Atom to it.



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