Go to advanced search

by ejolson
Sun Jun 30, 2019 5:15 pm
Forum: General discussion
Topic: (pi4) so how fast is 'entry level pc performance'
Replies: 37
Views: 2268

Re: (pi4) so how fast is 'entry level pc performance'

But really, users of Android and a million different web sites never, not to mention users of most routers, drivers of Tesla's etc never actually "encounter" Linux. No more so than I encounter the engine in the bus that takes be to work everyday. Don't get me started on bus engines. I saw enough fa...
by ejolson
Sun Jun 30, 2019 10:40 am
Forum: General discussion
Topic: Pi 4B+Buster+Mathematica When? [Solved]
Replies: 8
Views: 694

Re: Pi 4B+Buster+Mathematica When?

In reply to the thread title, rather than the more specific posting question... In medieval cookbooks (which were written by professional cooks for professional cooks), one often comes across the line "...cook until enow". It means cook it until it's done. Likewise, Mathenmatica will arrive for Ras...
by ejolson
Sat Jun 29, 2019 7:22 pm
Forum: General discussion
Topic: (pi4) so how fast is 'entry level pc performance'
Replies: 37
Views: 2268

Re: (pi4) so how fast is 'entry level pc performance'

Musketeer wrote:
Sat Jun 29, 2019 6:37 pm
Core 2 got 18 GFLOPS
PI4 like 16 +/-?

http://web.eece.maine.edu/~vweaver/grou ... hines.html
Running the same HPL High-Performance Linpack benchmark on the Pi 4B achieves 10.9 GFlops as reported here.
by ejolson
Sat Jun 29, 2019 10:32 am
Forum: General discussion
Topic: Pi 4B+Buster+Mathematica When? [Solved]
Replies: 8
Views: 694

Pi 4B+Buster+Mathematica When? [Solved]

Is it safe to assume that Mathematica will be available in Raspbian Buster and running on the Pi 4B by the end of August in time for the Fall semester?
by ejolson
Fri Jun 28, 2019 9:37 pm
Forum: Troubleshooting
Topic: Newer Raspbian versions a lot slower than older ones? [Solved]
Replies: 7
Views: 618

Re: Newer Raspbian versions a lot slower than older ones?

So it looks like I'm doing *something* that has become very heavy in the new OS, which isn't covered by these tests. The Cortex-A72 cores used in the Pi 4B are subject to Spectre-style side-channel information leakage while the A53 cores in the 3B+ are not. As a result, the default Rasbian Buster k...
by ejolson
Fri Jun 28, 2019 6:21 pm
Forum: General discussion
Topic: A Pi Pie Chart
Replies: 109
Views: 9315

Re: A Pi Pie Chart

So anyway, here are my numbers for the Pi 3B vs Pi 4: Prime Sieve: 483 / 1411 Merge Sort: 301 / 540 Fourier: 149 / 258 Lorenz 96: 905 / 4610 Ah. And there's the cause of the MergeSort problem: It broke in gcc. Here are the same numbers for the Pi 4, but using gcc 8.3 that's on the Buster image: Pri...
by ejolson
Fri Jun 28, 2019 8:34 am
Forum: Troubleshooting
Topic: Newer Raspbian versions a lot slower than older ones? [Solved]
Replies: 7
Views: 618

Re: Newer Raspbian versions a lot slower than older ones?

I just installed Raspbian Buster to run some performance tests of my own software on my new Pi 4. To my surprise, the performance was nearly identical to that of my older Pi 3 (not even a 3+). So, I put the Buster MicroSD card into my old Pi 3, and it turned out that CPU load of my software doubled...
by ejolson
Thu Jun 27, 2019 9:39 pm
Forum: General discussion
Topic: A Pi Pie Chart
Replies: 109
Views: 9315

Re: A Pi Pie Chart

Would you mind compiling the pichart program downloadable from a link on the first post of this thread and reporting the output (both OpenMP and serial) running on the Pi 4B with the new 9.1 compiler? Here it is (4GB version if it makes any difference). pi@pi4:~/pichart-30 $ ./pichart-openmp pichar...
by ejolson
Thu Jun 27, 2019 9:37 pm
Forum: General discussion
Topic: Pi 4 and the Million Digit Fibonacci Challenge.
Replies: 17
Views: 1090

Re: Pi 4 and the Million Digit Fibonacci Challenge.

Would you mind compiling the pichart program downloadable from a link on the first post of this thread and reporting the output (both OpenMP and serial) running on the Pi 4B with the new 9.1 compiler? Here it is (4GB version if it makes any difference). pi@pi4:~/pichart-30 $ ./pichart-openmp pichar...
by ejolson
Thu Jun 27, 2019 5:47 pm
Forum: General discussion
Topic: Pi 4 and the Million Digit Fibonacci Challenge.
Replies: 17
Views: 1090

Re: Pi 4 and the Million Digit Fibonacci Challenge.

This is the Pi4 4GB result for the plain C code (fibonacci.c) GCC 9.1 $ gcc -O3 -s fibo.c -o fibo $ time ./fibo | head -c 32; time ./fibo | tail -c 32 10727395641800477229364813596225 real 0m8.500s user 0m8.468s sys 0m0.039s 4856539211500699706378405156269 real 0m8.480s user 0m8.463s sys 0m0.021s T...
by ejolson
Thu Jun 27, 2019 11:26 am
Forum: General discussion
Topic: Why do I not see 2x speed up in sysbench?
Replies: 5
Views: 586

Re: Why do I not see 2x speed up in sysbench?

On the blog post it says "yielding performance increases over Raspberry Pi 3B+ of between two and four times, depending on the benchmark." when talking about moving to the newer CPU arch. And yet testing the CPU alone with sysbench shows only 15% speed up. confused.com :? Is sysbench that bad??? I ...
by ejolson
Wed Jun 26, 2019 9:32 pm
Forum: General discussion
Topic: Why is the RPi4 being advertised as a desktop computer?
Replies: 80
Views: 7591

Re: Why is the RPi4 being advertised as a desktop computer?

Ergo, the Pi is a desktop computer. As far as I can tell, the Pi is not being advertised as a desktop replacement. The announcement actually said For the first time we provide a PC-like level of performance for most users, while retaining the interfacing capabilities and hackability of the classic ...
by ejolson
Wed Jun 26, 2019 8:39 am
Forum: General programming discussion
Topic: Project Digital Apocalypse Not Now
Replies: 715
Views: 26822

Re: A Final Fibonacci Challenge

Can we run all these again on a Pi4? whoops been asked :oops: It would be interesting to see which of those hand-coded big-number multiplication algorithms run faster (or slower) on the new hardware. Given these preliminary results for the merge sort (perhaps due only to different compiler optimiza...
by ejolson
Wed Jun 26, 2019 8:22 am
Forum: General programming discussion
Topic: Project Digital Apocalypse Not Now
Replies: 715
Views: 26822

Re: Speeding up the fast doubling algorithm

I implemented the fast doubling algorithm in Python as shown below. That's a nice roundup of Python codes. I'll run them through fibench on the super-cheap cluster to see what happens. With all the Pi 4B excitement, it seems the updated JavaScript codes are somewhat delayed. Fortunately, the Pi Zer...
by ejolson
Tue Jun 25, 2019 9:32 pm
Forum: General discussion
Topic: LINUX to WIN 10 Remote Desktop Connectivity
Replies: 8
Views: 414

Re: LINUX to WIN 10 Remote Desktop Connectivity

Hi, this is my first time posting and I'm hoping someone will take pity on me and guide me in the right direction. The short version of my story is that I'm looking for a way to install a Raspberry Pi into a robot of sorts so that we can connect to it via Windows 10 remote desktop. Is this possible...
by ejolson
Tue Jun 25, 2019 9:15 pm
Forum: General discussion
Topic: (pi4) so how fast is 'entry level pc performance'
Replies: 37
Views: 2268

Re: (pi4) so how fast is 'entry level pc performance'

You can always purchase a $100 business computer to fulfill the basic home computer role And where do you buy a new business computer for $100? In December I bought the cheapest laptop in the store, but it was more than US$100. That laptop has a dual-core AMD A6-9225 APU that is 33 times faster tha...
by ejolson
Tue Jun 25, 2019 4:36 pm
Forum: General discussion
Topic: A Pi Pie Chart
Replies: 109
Views: 9315

Re: A Pi Pie Chart

Pi4B results Thanks for posting. Your results are similar, though perhaps slightly faster, compared to the graphs that James uploaded which I converted to portable network graphics: Here "My Computer" refers to the new Raspberry Pi 4B. Compared to the original Pi B the Pi 4B is 26.8474 times faster...
by ejolson
Tue Jun 25, 2019 3:40 pm
Forum: General discussion
Topic: A Pi Pie Chart
Replies: 109
Views: 9315

Re: A Pi Pie Chart

Pi4B results Thanks for posting. Your results are similar, though perhaps slightly faster, compared to the graphs that James uploaded here which I converted to portable network graphics: . pichart-mp-pi4.png pichart-serial-pi4.png Here "My Computer" refers to the new Raspberry Pi 4B. Compared to th...
by ejolson
Tue Jun 25, 2019 2:34 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 697
Views: 58906

Re: Raspberry Pi 4 Thread - general discussion

Have my hands on a pi4 now - yay ! So onto some quick power draw tests Idling on raspbian desktop: 562 mA 4 cores in use * 1005 mA Shutdown with sudo shutdown -h 20 mA *Quick way to busy the 4 cores: cat /dev/zero >/dev/null & cat /dev/zero >/dev/null & cat /dev/zero >/dev/null & cat /dev/zero >/de...
by ejolson
Tue Jun 25, 2019 12:45 am
Forum: General discussion
Topic: Is the new Raspberry Pi 4 vulnerable to Meltdown and Spectre attacks?
Replies: 13
Views: 1540

Re: Is the new Raspberry Pi 4 vulnerable to Meltdown and Spectre attacks?

There was an interesting note on how effective these attacks could be last year: In fact, I doubt we will ever see a lot of in-the-wild malware using the Meltdown or Spectre exploits. Memory-read attacks simply aren't that attractive to most attackers: they don't allow an attacker to run arbitrary ...
by ejolson
Mon Jun 24, 2019 10:42 pm
Forum: General discussion
Topic: Is the new Raspberry Pi 4 vulnerable to Meltdown and Spectre attacks?
Replies: 13
Views: 1540

Re: Is the new Raspberry Pi 4 vulnerable to Meltdown and Spectre attacks?

It should be as it uses the A72, the OS or whatever may stop that. According to Wikipedia ARM has reported that the majority of their processors are not vulnerable, and published a list of the specific processors that are affected. The ARM Cortex-A75 core is affected directly by both Meltdown and S...
by ejolson
Mon Jun 24, 2019 6:28 pm
Forum: General programming discussion
Topic: Raspberry Pi Benchmarks
Replies: 135
Views: 84660

Re: Raspberry Pi Benchmarks

Raspberry Pi 4 Benchmarks I have run all of my relevant benchmarks and stress tests on the new Raspberry Pi 4. The early opportunity to run the programs was due to my acceptance of the request for me to become a volunteer, exercising the system prior to launch. I will be posting results here shortl...
by ejolson
Mon Jun 24, 2019 10:05 am
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 697
Views: 58906

Re: Raspberry Pi 4 Thread - general discussion

Mostly the same, but mo' better, just how we like it. Under the skin, much is different. This is the biggest HW change in Pi history. The new hardware seems pretty much what people have been asking for. A few questions: 1. Are all the USB ports behind an internal hub or can some of them function in...
by ejolson
Sun Jun 23, 2019 10:43 pm
Forum: General discussion
Topic: Colocation between users (the cheap way)
Replies: 10
Views: 474

Re: Colocation between users (the cheap way)

About the legal issues, as soon as I am aware (myself or via a third party) that some illicit activity is taking place, I would need to intervene and stop it. Then talking to the owner for its review and solution would suffice. Unfortunately, the way you might become aware of illicit activity is fo...
by ejolson
Sun Jun 23, 2019 9:58 pm
Forum: General discussion
Topic: Colocation between users (the cheap way)
Replies: 10
Views: 474

Re: Colocation between users (the cheap way)

Cheers! What you describe is technically possible and attractive due to the low power requirements of the Pi. However, the idea is also fraught with peril. For example, avoiding financial transactions may keep you within the contract for home internet service, but that same contract may also make y...

Go to advanced search