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Le 21/08/2018 à 05:26, dick balaska a écrit :
> I added a 2.8Ghz 6 core i5 to the farm this week.
> ( http://www.buckosoft.com/bsac/meta/ )
> $500 including a nice 23" HD monitor.
>
>
> I expected it to be slighty faster than my 3.4 Ghz i7 (4 core/8 thread)
> and 50% faster than my (3) 3.2Ghz 4 core i5s.
>
> No.
>
> It is 50% faster than my i7 and more than twice as fast as my other i5(s).
>
> I'm not complaining ( :) ) but sheesh. Shouldn't intel call this an i6
> or something? Clearly it is a newer/faster breed than the other boxes
> that have an i5. It seems that intel is really underselling themselves
> here.
>
Was this speed measured with povray benchmark ?
Same binary ?
What about the memory speed ? (and CL values)
Beware of the cache effect.
From an old i7 measure (on i7-980X), thread without core are between
20% and 25% of thread with core, when rendering with 3.7.
Not only the new generation is faster, it is also smaller and use less
power. Yet no one wants to break the 4GHz barriers.
(but on the other hand, the new generation has a backdoor on the
network, even in suspended state and it cannot be closed)
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Am 21.08.2018 um 13:08 schrieb Le Forgeron:
> From an old i7 measure (on i7-980X), thread without core are between 20%
> and 25% of thread with core, when rendering with 3.7.
I guess you mean, "thread with virtual core" (i.e. hyperthreading) and
"thread with physical core".
A literal "thread without core" (setting `+wt` higher than the number of
virtual cores) will typically give you 0% performance gain (or even a
performance loss) in POV-Ray.
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On 08/21/2018 07:08 AM, Le Forgeron wrote:
> Was this speed measured with povray benchmark ?
> Same binary ?
Same binary. Not the benchmark, building frames for my animation.
>
> What about the memory speed ? (and CL values)
> Beware of the cache effect.
I don't care about any of that. All I care is that POV-Ray finishes
twice as fast. :)
>
> From an old i7 measure (on i7-980X), thread without core are between 20%
> and 25% of thread with core, when rendering with 3.7.
Yes, I typically see around 20% increase in throughput with my i7 vs. an
i5. It *can* float to near 100% on occasion, depending on what I'm
looking at. One thing I always thought odd, my kitchen volcano scene,
where I'm looking at the floor (superellipsoid tiles with a box for
grout) the i7 is actually 5-10% slower than an i5.
(This floor: http://www.buckosoft.com/tteoac/video/frames/ttko0524.png )
>
> Not only the new generation is faster, it is also smaller and use less
> power. Yet no one wants to break the 4GHz barriers.
I've noticed a Ghz decrease in my last couple of boxes. From 3.4Ghz to
3.0Ghz and now 2.8Ghz. Certainly that will run "cooler".
The box is in the living room and is silent, as opposed to my i7 which
has dual fans that have a teeth-floating harmonic.
> (but on the other hand, the new generation has a backdoor on the
> network, even in suspended state and it cannot be closed)
um...
--
dik
Rendered 920576 of 921600 pixels (99%)
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On 8/20/2018 11:26 PM, dick balaska wrote:
> I added a 2.8Ghz 6 core i5 to the farm this week.
> ( http://www.buckosoft.com/bsac/meta/ )
> $500 including a nice 23" HD monitor.
>
$500 for the whole computer, or just the CPU + monitor?
Mike
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On 08/21/2018 11:03 PM, Mike Horvath wrote:
> On 8/20/2018 11:26 PM, dick balaska wrote:
>> I added a 2.8Ghz 6 core i5 to the farm this week.
>> ( http://www.buckosoft.com/bsac/meta/ )
>> $500 including a nice 23" HD monitor.
>>
>
> $500 for the whole computer, or just the CPU + monitor?
>
>
> Mike
Best Buy. $519. 12GB RAM 1TB hard drive.
--
dik
Rendered 920576 of 921600 pixels (99%)
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On 8/22/2018 2:27 AM, dick balaska wrote:
> On 08/21/2018 11:03 PM, Mike Horvath wrote:
>> On 8/20/2018 11:26 PM, dick balaska wrote:
>>> I added a 2.8Ghz 6 core i5 to the farm this week.
>>> ( http://www.buckosoft.com/bsac/meta/ )
>>> $500 including a nice 23" HD monitor.
>>>
>>
>> $500 for the whole computer, or just the CPU + monitor?
>>
>>
>> Mike
>
> Best Buy. $519. 12GB RAM 1TB hard drive.
>
Do you have a link? There are some good deals at BB in a "salvage parts
from an old PC to help build a new one" sense. I.e. I have an SSD and
graphics card already that I could put into one of these machines.
Mike
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On 08/22/2018 06:18 PM, Mike Horvath wrote:
> On 8/22/2018 2:27 AM, dick balaska wrote:
>> On 08/21/2018 11:03 PM, Mike Horvath wrote:
>>> On 8/20/2018 11:26 PM, dick balaska wrote:
>>>> I added a 2.8Ghz 6 core i5 to the farm this week.
>>>> ( http://www.buckosoft.com/bsac/meta/ )
>>>> $500 including a nice 23" HD monitor.
>>>>
>>>
>>> $500 for the whole computer, or just the CPU + monitor?
>>>
>>>
>>> Mike
>>
>> Best Buy. $519. 12GB RAM 1TB hard drive.
>>
>
> Do you have a link? There are some good deals at BB in a "salvage parts
> from an old PC to help build a new one" sense. I.e. I have an SSD and
> graphics card already that I could put into one of these machines.
>
>
> Mike
Pretty weird. This is the box I bought, the link is from my history.
But, I did *not* pay $800 with monitor. I would have gone for a lesser
machine.
Technically, the machine is for the 6 year old to play minecraft. :)
https://www.bestbuy.com/site/dell-inspiron-desktop-intel-core-i5-12gb-memory-1tb-hard-drive-black-with-silver-trim/6228201.p?skuId=6228201
--
dik
Rendered 920576 of 921600 pixels (99%)
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On 08/23/2018 06:07 AM, dick balaska wrote:
>
>
https://www.bestbuy.com/site/dell-inspiron-desktop-intel-core-i5-12gb-memory-1tb-hard-drive-black-with-silver-trim/6228201.p?skuId=6228201
>
"Smart six-core, twelve-way processing performance"
No it doesn't.
$ cat /proc/cpuinfo
vendor_id : GenuineIntel
model name : Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz
cpu MHz : 3799.999
cache size : 9216 KB
siblings : 6
cpu cores : 6
My 4 core / 8 thread i7
$ cat /proc/cpuinfo
vendor_id : GenuineIntel
model name : Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
cpu MHz : 3492.055
cache size : 8192 KB
siblings : 8
cpu cores : 4
--
dik
Rendered 920576 of 921600 pixels (99%)
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dick balaska <dic### [at] buckosoft com> wrote:
> > Do you have a link? There are some good deals at BB in a "salvage parts
> > from an old PC to help build a new one" sense. I.e. I have an SSD and
> > graphics card already that I could put into one of these machines.
I could fill several 4-foot cubes with all the motherboards, HDD's, memory, etc
that we have here.
Whole pallets of towers, SFF, USDT, laptops, servers, ....
> Pretty weird. This is the box I bought, the link is from my history.
> But, I did *not* pay $800 with monitor. I would have gone for a lesser
> machine.
Let me know if you need anything, and I can see what we've got that is or is not
currently listed. I don't have any control over the pricing or negotiations,
but it's _gotta_ be cheaper than brand new from Best Buy.
And I can hand pick and pack.
http://www.cecent.com/
https://www.ebay.com/usr/cecet
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On 08/23/2018 06:15 AM, dick balaska wrote:
> On 08/23/2018 06:07 AM, dick balaska wrote:
>
>>
>>
https://www.bestbuy.com/site/dell-inspiron-desktop-intel-core-i5-12gb-memory-1tb-hard-drive-black-with-silver-trim/6228201.p?skuId=6228201
>>
>
> "Smart six-core, twelve-way processing performance"
> No it doesn't.
>
> $ cat /proc/cpuinfo
> vendor_id : GenuineIntel
> model name : Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz
> cpu MHz : 3799.999
> cache size : 9216 KB
> siblings : 6
> cpu cores : 6
>
>
> My 4 core / 8 thread i7
> $ cat /proc/cpuinfo
> vendor_id : GenuineIntel
> model name : Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
> cpu MHz : 3492.055
> cache size : 8192 KB
> siblings : 8
> cpu cores : 4
>
I came across an article a while back about Intel dropping
hyper-threading in favor of cores at the lower end. Looks like yours is
one of those processors!
More cores is better for POV-Ray so this no threading more cores change
helps us - and especially in v3.8 over v3.7 given it's threads > cores
performance has slowed more than threads <= cores has (6% vs about 3%
last I did any measures).
Note that your i5-8400 has a turbo frequency of 'up to' 4GHz throttled
by temperature. Many other processors have the turbo option too though
often it's not a much higher frequency than the normal in older
generations. If turbo mode is not off turned off in bios, performance
measures to 'clock time' can be all over the place - better to measure
hardware cycles and even there you need to be sure you are not thrashing
your caches with other work for example.
My little i3-4130 doesn't have the turbo mode which makes timing
relative to the 'clock' a little more reliable.
Well, excepting starting earlier this year when measured time seemed to
get more unstable. Has me wondering about possible impacts for some of
those security patches for metldown and specter exposures - but I've
done no digging. Might be I'm just timing different features of POV-Ray
of late that have different register and cache usage patterns.
Aside: This is the first I've noticed /proc/cpuinfo having bug
information. Mine shows:
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf
Any of those gone on your i5-8400?
Bill P.
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