By: Mark Roulo (nothanks.delete@this.xxx.com), October 14, 2020 2:21 pm
Paul A. Clayton (paaronclayton.delete@this.gmail.com) on October 14, 2020 12:11 pm wrote:
> hobold (hobold.delete@this.vectorizer.org) on October 10, 2020 12:33 pm wrote:
> > David Kanter (dkanter.delete@this.realworldtech.com) on October 10, 2020 10:36 am wrote:
> >
> > > Cinebench is a total rubbish benchmark!
> >
> > It happens to correlate very well with one or two workloads I care about. So for me it's
> > been a useful benchmark, giving me a good idea of the performance I can expect.
> >
> > But like any performance metric (and like any benchmark), Cinebench tries to do an
> > impossible thing when it maps "computing speed" to one single real number. That loses
> > all information about specific strengths and weaknesses of different machines.
>
> >
> > Projecting a vector of many real numbers down to one single real number is always
> > an information loss.
>
> Mathematically, I am not certain that is the case. I do not understand infinities and have very little
> exposure to information theory, but I know that for a fixed/known number of prime numbers one can
> compose those prime numbers (by multiplication) into a single integer without loss of information
> (i.e., entry count and all primes provide a compression function). There was a (mediocre) science
> fiction story that used n = (prime_A)xA * (prime_B)xB * ... (prime_Ω)xΩ to encode a
> vast amount of information into a single integer. Since individual measurements have limited precision
> and range, concatenation of digits would convert N M-digit values into one M*N-digit value.
>
> Yes, that is not what you meant. You meant something more like one single number that can be trivially
> used to accurately estimate performance for a workload based on a benchmark result.

Read it as a vector of magnitudes cannot be represented by a single magnitude without information loss.
TopicPosted ByDate
Zen 3Blue2020/10/08 08:58 AM
Zen 3Rayla2020/10/08 09:10 AM
Does anyone know whether Zen 3 has AVX-512? (NT)Foo_2020/10/08 10:54 AM
Does anyone know whether Zen 3 has AVX-512?Adrian2020/10/08 11:11 AM
Zen 3 - Number of load/store units2020/10/08 09:21 AM
Zen 3 - Number of load/store unitsRayla2020/10/08 09:28 AM
Zen 3 - Number of load/store units2020/10/08 10:22 AM
Zen 3 - Number of load/store unitsTravis Downs2020/10/08 08:45 PM
Zen 3 - CAD benchmarkPer Hesselgren2020/10/09 06:29 AM
Zen 3 - Number of load/store unitsitsmydamnation2020/10/08 01:38 PM
Zen 3 - Number of load/store unitsGroo2020/10/08 01:48 PM
Zen 3 - Number of load/store unitsWilco2020/10/08 02:02 PM
Zen 3 - Number of load/store unitsDummond D. Slow2020/10/08 03:39 PM
Zen 3 - Number of load/store unitsDoug S2020/10/09 07:11 AM
Zen 3 - Number of load/store unitsDummond D. Slow2020/10/09 08:43 AM
Zen 3 - Number of load/store unitsDoug S2020/10/09 12:43 PM
N7 and N7P are not load/Store units - please fix the topic in your replies (NT)Heikki Kultala2020/10/10 06:37 AM
Zen 3Jeff S.2020/10/08 11:16 AM
Zen 3anon2020/10/08 12:57 PM
Disappointing opening line in paperPaul A. Clayton2020/10/11 05:16 AM
Thoughts on "Improving the Utilization of µop Caches..."Paul A. Clayton2020/10/14 11:11 AM
Thoughts on "Improving the Utilization of µop Caches..."anon2020/10/15 10:56 AM
Thoughts on "Improving the Utilization of µop Caches..."anon2020/10/15 10:57 AM
Sorry about the messanon2020/10/15 10:58 AM
Sorry about the messBrett2020/10/16 02:22 AM
Caching dependence info in µop cachePaul A. Clayton2020/10/16 05:20 AM
Caching dependence info in µop cacheanon2020/10/16 11:36 AM
Caching dependence info in µop cachePaul A. Clayton2020/10/18 12:28 PM
Zen 3juanrga2020/10/09 09:12 AM
Zen 3Mr. Camel2020/10/09 05:30 PM
Zen 3anon.12020/10/09 11:44 PM
Cinebench is terrible benchmarkDavid Kanter2020/10/10 09:36 AM
Cinebench is terrible benchmarkanon.12020/10/10 11:06 AM
Cinebench is terrible benchmarkhobold2020/10/10 11:33 AM
Some comments on benchmarksPaul A. Clayton2020/10/14 11:11 AM
Some comments on benchmarksMark Roulo2020/10/14 02:21 PM
Zen 3majord2020/10/15 03:02 AM
Zen 3hobold2020/10/10 07:58 AM
Zen 3Maynard Handley2020/10/10 09:36 AM
Zen 3hobold2020/10/10 11:19 AM
Zen 3anon2020/10/11 01:58 AM
Zen 3hobold2020/10/11 11:32 AM
Zen 3anon2020/10/11 12:07 PM
Zen 3hobold2020/10/11 01:22 PM
Zen 3anon2020/10/10 10:51 AM
Zen 3Michael S2020/10/11 12:16 AM
Zen 3hobold2020/10/11 01:13 AM
Zen 3Michael S2020/10/11 01:18 AM
Zen 3anon.12020/10/11 11:17 AM
Zen 3David Hess2020/10/12 05:43 AM
more power? (NT)anonymous22020/10/12 12:26 PM
I think he's comparing 65W 3700X vs 105W 5800X (NT)John H2020/10/12 03:33 PM
?! Those are apples and oranges! (NT)anon2020/10/12 03:49 PM