#comparch — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #comparch, aggregated by home.social.
-
The processed recordings of the three #CompArch B0B35LSP lectures I presented have been updated/reprocessed. I have spent considerable time fixing the blur, which makes the #QtRvSim #RISCV simulation sequences especially less readable. There have been more problems, mainly in the professional #BlackMagic setup at our university. Even after some reports and related fixes, there seems to be at least one frame missing in every 4k recordings, so there is no match between the number of frames, recording time, and frame rate. This results in the detection of the file as a variable frame rate one by #kdenlive and even other tools (i.e. commercial on colleague’s MacOS). This results in transcoding to proper 25fps during import. There is an option to choose that as lossless, but when I already have 50GB from the original 1.5-hour recording, then I cannot imagine what the size would be. So there is degradation, and when the project is FullHD, and I want to expand one quarter of the original https://youtu.be/pqW9_1t5Y5U 4k video, which is holding my presentation monitor and projector output to the whole FullHD screen, then it leads to practical half resolution. Even though I have spent time with full 4k processing, then final scale down to FullHD loads to interpolation and blur, even for the nearest pixel select option. I have solved the problem by extracting the top-right quarter of the input using ffmpeg with high-quality encoding, then I have imported this new screen file, added it to the timeline after the already edited lecture, and then done precise manual replacement/switch of both audio and video chains in the “*.kdenlive” file to place this extracted screen to all already edited chunks in the correct playlist. I have then even replaced the converted 25 fps sources with the problematic original ones and re-run rendering, with confirmation of a VBR warning about possible skew between audio and video. Quite a lot of time was spent on incorrect output from a professional and probably very expensive setup. I have never had such problems with #opensource #obsstudio when using my old Intel HD graphics-based laptop (I have objected to signing the NVIDIA NDA at the university and do not want to use their HW if at least a little possible) to capture and process FullHD 50 Hz and sometimes even 4k 25 Hz videos from abandoned 4k #DataVideo camera with uncompressed stream over HDMI and USB CamLink. I would expect that if the expensive HW producers provide full resources on how to update, correct, enhance, and replace SW and firmware in their products to the community, then it would save a lot of time for everybody.
-
B0B35LSP - Logické systémy a procesory - 13 - Cache [LS 2025/26]
-
B0B35LSP - Logické systémy a procesory - 12 - Pipeline [LS 2025/26]
-
B0B35LSP - Logické systémy a procesory - 11 - Procesor [LS 2025/26]
-
If you have interest in basic or more advanced computer architectures learning and teaching then I plan to visit #RISCV #FOSDEM devroom this Satturday. We can discuss even use of our #QtRvSim in the teaching. We are working on Sv32 and latter even Sv39 addition to extend this tool even for teaching operating system basic concepts. Tenative goal is to run MIT-PDOS one day. We have new #QtRvSim manual at our #CompArch site as well and revamped online training site (thanks to Jakub Pelc https://swpelc.eu/).
-
Pavel Píša: Advanced Computer Architectures – 13 – ARM and RISC-V [M35PAP Winter 25/26]
-
Pavel Píša: Advanced Computer Architectures – 13 – x86 Architecture [M35PAP Winter 25/26]
-
Pavel Píša: Advanced Computer Architectures – 12 GPU and GPGPU [M35PAP Winter 25/26]
-
Pavel Píša: Advanced Computer Architectures – 08 Memory Consistency [M35PAP Winter 25/26]
-
Pavel Píša: Advanced Computer Architectures – 09 Parallel Execution [M35PAP Winter 25/26]
-
#CVUTFEL ( #CVUT FEE) Advanced Computer Architecture ( #comparch) course recodings of the first five lectures are published at #VHSky.cz. Czech language recordings from the 2021 round are available as well. The B4M35PAP course builds on the knowledge from the introductory #comparch B35APO course (recordings). Each student builds their own CPU design (tools and ISA are open). The #QtRvSim #RISCV educational simulator is provided for inspiration (online version and The Czech Technical University #comparch related courses guidepost https://comparch.edu.cvut.cz/).
P.S.: Help with tooling for transcribing the lectures in my Czenglish dialect into English subtitles would be appreciated, as well as all other forms of feedback. For the introductory course, we provide reusable LaTeX sources (CC-BY-SA license) that are open to pull requests.
-
Summer 2025 #cvut defended theses by OTREES / “my” students:
- Matyáš Bobek, FlexCAN Controller Emulation for QEMU, #qemu #canbus (git), I hope for mainlining soon, my thanks to
@marckleinebudde for review - Albert Bezděk, Stereo Camera FPGA Interface and Processing for Zynq Based Systems, with initial rectification and disparity in #XilinX #Zynq #FPGA (git), thank to Martin Meloun for review
- Michal Matiáš, NuttX RTOS Driver for Single Unshielded Twisted Pair Communication, working with ncv7410 and ESP32-C6 for now (nuttx, apps git), continues by #GSoC expected to lead to broader OpenAlliance SPI Ethernet MAC-PHY T1S for mainline #NuttX support after summer, thanks to @cynerd for review
See the last OTREES theses list for link to repositories and more
Another related theses from #cvut Faculty of Information Technologies mentored by Michal Štepanovský to mention:
- Jan Medek, Implementation of RISC-V soft-core processor on FPGA board with real-time operating system support, port (git) of #NuttX to the own setup of Ibex #riscv to Digilent Basys 3 and Digilent Nexys Video, includes even #NuttX, #RTEMS, #Zephyr, #FreeRTOS and RT-Thread choice analysis, some minor clarifications in my review, out of the text documentation, the student ported NuttX even to the CPU system prepared in frame of the next thesis
- Ondřej Golasowski, RISC-V open-source microarchitecture analysis and optimization, the VESP-BETA single-cycle RV32IMZicsr #riscv design for basic #comparch education with #FPGA labs
Stay tuned next summer as well, there is student interested in thesis to add MMU to #QtRvSim
- Matyáš Bobek, FlexCAN Controller Emulation for QEMU, #qemu #canbus (git), I hope for mainlining soon, my thanks to
-
@frankenswine @LainTrain If you want to start learning #riscv ISA then the basic introduction to the minimal set of RV32 instructions can be found at our #comparch course tutorial page https://cw.fel.cvut.cz/wiki/courses/b35apo/en/tutorials/03/start .
You can test the code on the #QtRvSim single-cycle simulator setup and then follow to the pipelined version. The simulator can be installed on GNU/Linux, Windows, MAC OS and online version is available at https://comparch.edu.cvut.cz/ . The related lectures are available at https://cw.fel.cvut.cz/wiki/courses/b35apo/en/lectures/start . There are even advertisements free accessible recordings available at https://vhsky.cz/w/p/8Ejstt3Tfh8mWGcjQcEL2S -
The new book how to build #riscv processor for #comparch courses is on the horizon (ETA later H2 2025) RISC-V System-on-Chip Design by D. Harris, J. Stine, R. Thompson, S. Harris. It has been presented at the RISC-V International Academic and Training SIG meeting. The recording of the session is available on YouTube https://youtu.be/Qyq5nHUDt4g The related configurable RV32I to RV64IMAFDCB core and Wally SoC sources https://github.com/openhwgroup/cvw
-
If you want to learn #RiscV basic principles yourself or use it in your computer architectures #comparch basic classes, then you can use our really open and fully shared resources, no registration required for experimenting online https://comparch.edu.cvut.cz/, downloading #QtRvSim packages for all major desktop operating systems #linux, #macos, #mswidows and obtaining lectures with the sources https://cw.fel.cvut.cz/wiki/courses/b35apo/en/lectures/start and recordings on YouTube and even advertisement-free community PeerTube instance VHSky.cz. We offer even online training and and competition site https://comparch.edu.cvut.cz/online-tools/webeval/. In this case, we store SHA1 of your e-mail only for purpose to allow participants to reset their password. So again we do not intend and even cannot use your registration for advertisement for paid courses etc.
-
This morning I read a post on a very active commercial archaeology Facebook group, asking whether a young person with an interest in maths and archaeology could combine the two.
15 replies in and all the answers are basically "no, there's no maths in archaeology"!
How is it our 70-year-old subfield is still so invisible? #comparch
-
This morning I read a post on a very active commercial archaeology Facebook group, asking whether a young person with an interest in maths and archaeology could combine the two.
15 replies in and all the answers are basically "no, there's no maths in archaeology"!
How is it our 70-year-old subfield is still so invisible? #comparch
-
Call for panels* for #ArcheoFOSS 2023: https://www.archeofoss.org/2023/call-for-panels
ArcheoFOSS is a really nice community that IMO is doing all the right things in terms of conference accessibility and openness, i.e. unlike certain other computational archaeology conferences, it's free and fully hybrid.
* This year they're experimenting with doing only roundtable-style discussion panels, so check it out if you have something #digitalarch, #comparch, etc. you want to talk about!
-
seven open source RISC-V implementations compared
https://bitlog.it/20220118_asic_roundup_of_open_source_riscv_cpu_cores.html
via El Correo Libre (issue 47)