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by sadko4u
Mon Dec 09, 2019 1:21 pm
Forum: Raspberry Pi
Topic: Raspberry PI 4: CPU too powerful/memory too slow?
Replies: 1
Views: 27

Re: Raspberry PI 4: CPU too powerful?

As the opposite situation, here's the same code for Raspberry Pi 3B+
Image
As we see here, there are less losses on load/store instructions than for Raspberry Pi 4B
by sadko4u
Mon Dec 09, 2019 12:49 pm
Forum: Raspberry Pi
Topic: Raspberry PI 4: CPU too powerful/memory too slow?
Replies: 1
Views: 27

Raspberry PI 4: CPU too powerful/memory too slow?

I'm currently profiling some DSP code that I try to optimize for Raspberry Pi 4. The most interesting thing related to Raspberry PI 4 is that SIMD-optimized code gets nearly the same performance as same scalar code. Currently looking with the perf tool, I see the bottleneck related to the... memory?...
by sadko4u
Tue Dec 03, 2019 8:03 pm
Forum: Original Scores & Recordings
Topic: Voice of Sands - Dune (instrumental)
Replies: 4
Views: 346

Re: Voice of Sands - Dune (instrumental)

That's some pretty serious shredding! It's nice to play with a full band - that's something I haven't done in years. (Actually it's been over a decade! I must be getting old.) Did you do any overdubbing on the guitar? There are some parts where I hear a harmony, but it doesn't look like you are pla...
by sadko4u
Thu Nov 28, 2019 9:12 am
Forum: Original Scores & Recordings
Topic: Voice of Sands - Dune (instrumental)
Replies: 4
Views: 346

Voice of Sands - Dune (instrumental)

A new video from our rehearsal/repetition room.
It's an instrumental version of one of our songs.
Now we have a bass player, too.
https://youtu.be/mLyVxHeGuIQ
by sadko4u
Thu Nov 21, 2019 10:22 pm
Forum: Raspberry Pi
Topic: Raspberry PI 4 vs AMD Athlon 64 X2 4400+
Replies: 3
Views: 291

Re: Raspberry PI 4 vs AMD Athlon 64 X2 4400+

So PI4 would be better option than old laptop(s) I have (I have also recent HW). But availability of software makes things different, no Mixbus available. Is there even arm port of Ardour? Anyway, thanks for benchmarks! The main disadvantage of PI is that it does not have SATA or M2 support out the...
by sadko4u
Thu Nov 21, 2019 2:07 pm
Forum: Raspberry Pi
Topic: Raspberry PI 4 vs AMD Athlon 64 X2 4400+
Replies: 3
Views: 291

Raspberry PI 4 vs AMD Athlon 64 X2 4400+

Testing benchmark of fused multiply-add routines currently developed in context of LSP Project. The results of benchmark I've compared to one of my computers with AMD Athlon 64 X2 4400+ CPU. It seems that Raspberry Pi is already faster than x86 processors issued in 2005's. The results of Raspberry P...
by sadko4u
Mon Nov 11, 2019 6:37 am
Forum: Raspberry Pi
Topic: New Ardour 6 alpha pre-release for Raspberry Pi
Replies: 6
Views: 448

Re: New Ardour 6 alpha pre-release for Raspberry Pi

Have you tried LSP bundle?
It would be nice to collect feedback from Raspberry users about how do they work under ARM processor.
by sadko4u
Tue Nov 05, 2019 1:36 pm
Forum: Plugins, Effects and Instruments
Topic: Overtone Filter by Luke M Craig
Replies: 15
Views: 729

Re: Overtone Filter by Luke M Craig

(I guess it is some Xcode stuff) No, it's Windows 32-bit standard calling convention of functions which declares - naming of the function in shared object/DLL. - the order of arguments and their registers/stack passing principles. - the responsibility of the stack frame removal (caller/callee). For...
by sadko4u
Wed Oct 23, 2019 10:24 am
Forum: Raspberry Pi
Topic: Some performance tests on RPI4 vs RPI3
Replies: 3
Views: 855

Re: Some performance tests on RPI4 vs RPI3

Measurements for Banana Pi M64 with Cortex-A53 on board 2GB RAM, Aarch64, Debian Stretch 9, GCC 6.3.0. Test #0 real 8m26.972s user 15m27.800s sys 0m59.050s Test #1 ┌Case─────────────────────────┬Time[s]┬───Iter┬Samp[s]┬────Est┬─Perf[i/s]┬Cost[us/i]┬Rel[%]┐ │native::pcomplex_mul3 x 256 │ 5.00│1324000...
by sadko4u
Sat Oct 19, 2019 6:57 pm
Forum: Raspberry Pi
Topic: Some performance tests on RPI4 vs RPI3
Replies: 3
Views: 855

Re: Some performance tests on RPI4 vs RPI3

Today I've installed Manjaro AArch64 system (with GCC 9.1.0) on another Raspberry Pi with 4GB RAM. Here are the same tests on the current devel branch of the LSP Plugins repository: Test #0 real 6m33.574s user 8m43.348s sys 1m3.176s Test #1 ┌Case─────────────────────────┬Time[s]┬───Iter┬Samp[s]┬────...
by sadko4u
Fri Oct 18, 2019 4:53 pm
Forum: Music & FOSS Advocacy
Topic: Thank-a-developer day
Replies: 23
Views: 1703

Re: Thank-a-developer day

You can combine a "Thank to developer" day with unofficial (in Russia, official) "Programmer's day" which is 256th day of the year.
https://en.wikipedia.org/wiki/Day_of_the_Programmer
by sadko4u
Tue Oct 01, 2019 9:10 am
Forum: Plugins, Effects and Instruments
Topic: Anyone know how to do 9/8 in Hydrogen?
Replies: 12
Views: 537

Re: Anyone know how to do 9/8 in Hydrogen?

You may use MIDI track + LSP Sampler as some sort of replacement for Hydrogen.
https://www.youtube.com/watch?v=GsNfZ0TF-bk
by sadko4u
Mon Sep 30, 2019 1:44 pm
Forum: Raspberry Pi
Topic: Some performance tests on RPI4 vs RPI3
Replies: 3
Views: 855

Re: Some performance tests on RPI4 vs RPI3

Found the reason for the case where in Test #3 the native code was faster than SIMD-optimized. On Cortex-A72 mixing s0-s31 register loads and stores with q0-q15 and d0-d31 arithmetics gives extra penalty. Replacing vld and vldm instructions with vld1.32 to one lane gives much more neat results on RP...
by sadko4u
Mon Sep 30, 2019 12:30 am
Forum: Raspberry Pi
Topic: Some performance tests on RPI4 vs RPI3
Replies: 3
Views: 855

Some performance tests on RPI4 vs RPI3

Here are some short observations made when testing performance of LSP Plugins on the new Raspberry PI 4 SBC vs some other competitors. Test configurations: ⋅ Raspberry PI 2B v 1.2 with Cortex A-53 CPU, Raspbian stretch, GCC 6.3 ⋅ Raspberry PI 3B with with Cortex A-53 CPU, Raspbia...
by sadko4u
Sun Sep 22, 2019 7:12 pm
Forum: Developer's Section
Topic: Video tutorial and lessons about dsp for starters
Replies: 1
Views: 436

Re: Video tutorial and lessons about dsp for starters

I'm having a translate into russian book written by A. Oppenheim from MIT.
It's very probably the author of this book.
The book is too academic and too hard to understand quickly due to many formulas.
Maybe these lectures are the easier material for understanding DSP.

Anyway, thanks for a link.

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