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by RoyLongbottom
Fri Jun 26, 2020 9:15 am
Forum: General programming discussion
Topic: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks
Replies: 14
Views: 1248

Re: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks

CPU Performance Throttling Effects Another of my reports covered this in: https://www.researchgate.net/publication/338230582_Raspberry_Pi_4_CPU_MHz_Throttling_Performance_Effects This was demonstrated by forcing the CPU clock speed to run continuously at 600 MHz, by setting the frequency scaling go...
by RoyLongbottom
Thu Jun 25, 2020 9:44 am
Forum: General programming discussion
Topic: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks
Replies: 14
Views: 1248

Re: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks

Power Over Ethernet I recently carried out tests of Raspberry Pi 4 systems using power supplied over LAN cables. My report is at ResearchGate in: https://www.researchgate.net/publication/341131710_Benchmarking_Raspberry_Pi_4_Running_From_Power_Over_Ethernet This covers using long, short, thick and ...
by RoyLongbottom
Wed Jun 24, 2020 3:17 pm
Forum: General programming discussion
Topic: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks
Replies: 14
Views: 1248

Re: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks

System Stress Tests These stress tests were run twice, once with a cooling fan in use and then with the fan disabled. Using a script file, six applications were started at the same time, each set to run for around 15 minutes. They covered known stressful floating point calculations, exercising near...
by RoyLongbottom
Tue Jun 23, 2020 8:58 pm
Forum: General programming discussion
Topic: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks
Replies: 14
Views: 1248

Re: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks

I think SanDisk may manufacture more than one grade of 32GB SD card. Do you know which SanDisk card you tested? It is SanDisk Ultra that I happened to have a bunch of. 64 GB drive is SanDisk Extreme that I deliberately bought to test handling large files that are more applicable for 64 bit working....
by RoyLongbottom
Tue Jun 23, 2020 1:06 pm
Forum: General programming discussion
Topic: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks
Replies: 14
Views: 1248

Re: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks

64 GB SD Card My initial 64 bit Raspberry Pi OS was installed on a 16 GB SD card, later cloned (by Windows Win32DiskImager) to one with 32 GB capacity. It soon became apparent that this was too small to handle extra large files on the main drive. So I bought an 64 GB higher speed version, which, su...
by RoyLongbottom
Mon Jun 22, 2020 4:15 pm
Forum: General programming discussion
Topic: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks
Replies: 14
Views: 1248

Re: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks

Stress Tests Floating Point Stress Tests Benchmarking Mode - These stress tests have a benchmarking mode that provides choices for a long running test. They cover number of threads, floating point operations carried out on each data word, and memory size to cover caches and RAM. Numeric sumchecks a...
by RoyLongbottom
Mon Jun 22, 2020 11:00 am
Forum: General programming discussion
Topic: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks
Replies: 14
Views: 1248

Re: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks

High Performance Linpack Benchmark I ported my ATLAS version of HPL, that I have run on earlier Raspberry Pi systems, to both of the 64 bit and 32 bit SD cards. See my report at ResearchGate: https://www.researchgate.net/publication/334561068_Raspberry_Pi_4B_Stress_Tests_Including_High_Performance_...
by RoyLongbottom
Sun Jun 21, 2020 5:35 pm
Forum: General programming discussion
Topic: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks
Replies: 14
Views: 1248

Re: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks

Usable RAM Measurements On running various benchmarks, it became clear that there were restrictions on how much RAM could be used by my C based benchmarks. Usable RAM - MALLOC - A simple program was written that allocated a specified amount of memory, using malloc, filled it with data, freed the sp...
by RoyLongbottom
Sun Jun 21, 2020 10:01 am
Forum: General programming discussion
Topic: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks
Replies: 14
Views: 1248

Re: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks

Java and OpenGL Benchmarks The Java benchmarks comprise class files that were produced some time ago. But source codes are available to renew the files. Performance can vary significantly using different Java Virtual Machines. So, comparisons might not be appropriate Java Whetstone Benchmark - The ...
by RoyLongbottom
Sat Jun 20, 2020 5:00 pm
Forum: General discussion
Topic: Raspberry Pi4 8GB xHPL benchmark results
Replies: 68
Views: 3801

Re: Raspberry Pi4 8GB xHPL benchmark results

My best 64 bit 8 GB result at 1500 MHz, using ATLAS Basic Linear Algebra, was: ================================================================================ T/V N NB P Q Time Gflops -------------------------------------------------------------------------------- WR11C2R4 30000 128 2 2 1584.59 1.1...
by RoyLongbottom
Sat Jun 20, 2020 2:41 pm
Forum: General programming discussion
Topic: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks
Replies: 14
Views: 1248

Re: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks

I/O Benchmarks This section relates to a benchmark that measures drive and network speeds, covering large files, random access and small files. There are two varieties, one that allows caching and the other that uses Direct I/O, without caching. Originally, the former was used for network testing a...
by RoyLongbottom
Sat Jun 20, 2020 9:23 am
Forum: General programming discussion
Topic: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks
Replies: 14
Views: 1248

Re: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks

Multithreading Benchmarks Most of the multithreading benchmarks execute the same calculations using 1, 2, 4 and 8 threads. Some are specifically designed to show what type of programs should not be multithreaded. 64 bit and 32 bit comparisons are not provided for these. This section includes anothe...
by RoyLongbottom
Fri Jun 19, 2020 1:25 pm
Forum: General programming discussion
Topic: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks
Replies: 14
Views: 1248

Re: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks

Single Thread Cache and RAM Benchmarks These measure performance using data from caches and RAM. There appears to be a compiler issue, in this area, where single precision (SP) speeds are shown to be much slower than using Double Precision (DP), when the opposite should apply. Integer speeds can al...
by RoyLongbottom
Thu Jun 18, 2020 2:57 pm
Forum: General programming discussion
Topic: Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks
Replies: 14
Views: 1248

Raspberry Pi 64 Bit OS and 8 GB Pi 4B Benchmarks

I have compiled and run my benchmarks via the 64 bit Beta Raspberry Pi OS, with tests including variations to exercise the Pi 4B with 8 GB RAM. Full results, with comparisons to 32 bit working are included in my report at ResearchGate: https://www.researchgate.net/publication/342232830_Raspberry_Pi_...
by RoyLongbottom
Thu Jun 18, 2020 2:43 pm
Forum: General programming discussion
Topic: Pi4B GPU GFlops comparable to Intel i7 FPU?
Replies: 3
Views: 791

Re: Pi4B GPU GFlops comparable to Intel i7 FPU?

Six years ago I developed and ran some benchmarks on my Core I7 that runs at up to 3900 MHz. For single precision operation, maximum potential GFLOPS, using SSE instructions, was 3.9 GHz x 4 (128 bit SSE register) x 2 (linked add and multiply) = 31.2 GFLOPS per core or 124.8 for 4 cores. It has 256...
by RoyLongbottom
Fri Dec 20, 2019 11:57 am
Forum: General programming discussion
Topic: Raspberry Pi Benchmarks
Replies: 158
Views: 114748

Re: Raspberry Pi Benchmarks

I'm not sure what I think. The statement makes me think that there are tons of benchmark results here but done in uncontrolled and/or unmonitored conditions. Thus rendering them all meaningless! This is an open forum for anyone to contribute. So, there can be no defined structure. My benchmark resu...
by RoyLongbottom
Fri Dec 20, 2019 11:14 am
Forum: General programming discussion
Topic: Raspberry Pi Benchmarks
Replies: 158
Views: 114748

Re: Raspberry Pi Benchmarks

Could we say that at end of each benchmark run, the command "vcgencmd get_thottled" must return zero? Then temperature, cooling, power supply issues are moot. It would be of more interest to identify how much throttling. This can be seen to change rapidly and might only affect a small section of a ...
by RoyLongbottom
Mon Dec 16, 2019 12:33 pm
Forum: General programming discussion
Topic: Raspberry Pi Benchmarks
Replies: 158
Views: 114748

Re: Raspberry Pi Benchmarks

Pi 4 32 Bit Performance With Throttled CPU MHz On running stress tests on a Pi 4, without a cooling fan attached, CPU temperature can increase, leading to clock speed throttling in stages, normally between 1500, 1000, 750 and 600 MHz. In turn, this leads to slower performance, proportional to to cl...
by RoyLongbottom
Wed Nov 13, 2019 10:52 am
Forum: General programming discussion
Topic: Raspberry Pi Benchmarks
Replies: 158
Views: 114748

Re: Raspberry Pi Benchmarks

Raspberry Pi 4B 64 Bit Stress Tests My 64 bit stress testing programs have now been run on Gentoo controlled Pi 4B systems, with some variations. They demonstrate the same heating and processor speed variations reported for those tested at 32 bits via Raspbian. The detailed Raspberry Pi 4B 64 Bit B...
by RoyLongbottom
Wed Sep 25, 2019 7:41 pm
Forum: General programming discussion
Topic: Raspberry Pi Benchmarks
Replies: 158
Views: 114748

64 Bit Raspberry Pi 4B Java and I/O Benchmarks

64 Bit Raspberry Pi 4B Java and I/O Benchmarks The benchmark results included below enable comparisons between the Pi 4B and 3B+, using the same benchmark and system software, but a sample of Pi 4 32 bit speeds is included, in some cases. Three operational differences were observed from the 32 bit ...
by RoyLongbottom
Wed Sep 18, 2019 2:42 pm
Forum: General programming discussion
Topic: Raspberry Pi Benchmarks
Replies: 158
Views: 114748

Re: Raspberry Pi Benchmarks

More 64 Bit Raspberry Pi 4B Multithreading Benchmarks OpenMP-MemSpeed This is the same program as the single core MemSpeed benchmark, but with increased memory sizes and compiled using OpenMP directives. The same program was also compiled without these directives (NotOpenMP-MemSpeed2), with the exa...
by RoyLongbottom
Wed Sep 18, 2019 2:23 pm
Forum: General programming discussion
Topic: Raspberry Pi Benchmarks
Replies: 158
Views: 114748

Re: Raspberry Pi Benchmarks

64 Bit Raspberry Pi 4B Multithreading Benchmarks Many of these benchmarks run using 1, 2, 4 and 8 threads, with others executing programs on all available cores via OpenMP. MP-Whetstone Benchmark Multiple threads each run the eight test functions at the same time, but with some dedicated variables....
by RoyLongbottom
Tue Sep 03, 2019 9:21 pm
Forum: Gentoo
Topic: 64 Bit Gentoo Raspberry Pi 3 Benchmarks
Replies: 6
Views: 15645

Re: 64 Bit Gentoo Raspberry Pi 3 Benchmarks

My first Raspberry Pi 4B benchmark results, via 64 bit Gentoo, are in the following topic:

https://www.raspberrypi.org/forums/view ... 5#p1530497
by RoyLongbottom
Tue Sep 03, 2019 9:00 pm
Forum: General programming discussion
Topic: Raspberry Pi Benchmarks
Replies: 158
Views: 114748

Re: Raspberry Pi Benchmarks

64 Bit Raspberry Pi 4B Benchmarks The Gentoo 64 bit Operating System is now available for the Raspberry Pi 4B from: https://github.com/sakaki-/gentoo-on-rpi-64bit Existing benchmarks were used to provide comparisons with the old Pi 3B+ model and the Pi 4B system using 32 bit Raspbian. Brief reminde...
by RoyLongbottom
Sat Jul 20, 2019 11:49 am
Forum: General programming discussion
Topic: Raspberry Pi Benchmarks
Replies: 158
Views: 114748

Re: Raspberry Pi Benchmarks

Input/Output Stress Test - burnindrive2 This is essentially the same as my program used during hundreds of UK Government and University computer acceptance trials during the 1970s and 1980s, with some significant achievements. Burnindrive writes four files, using 164 blocks of 64 KB, repeated 16 ti...

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