Human folly for 02023-09-19

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• Which CPUs have explicit cache flush assembly instructions (stackoverflow.com):

  #RTCG #hardware cache flush instructions for JIT #compilers on Cell and ARM.

• Synchronizing caches for JIT self modifying code on ARM (stackoverflow.com):

  #RTCG #hardware cache flush instructions on #ARM 64 #hardware for JIT #compilers

• Caches and self modifying code (community.arm.com):

  #RTCG #hardware cache flush functions on #ARM: __clear_cache, cacheflush, or FlushInstructionCache.

• How clear and invalidate ARM V7 processor cache from user mode on Linux (stackoverflow.com):

  to flush the instruction cache for #RTCG JIT #compilers on #ARM #Linux you need to make sure the memory is mapped with PROT_EXEC before you invoke sys_cacheflush or __clear_cache(). #hardware

• ARM Cortex A72 tuning IPC (sandsoftwaresound.net):

  #ARM Cortex-A72 #hardware “is a superscalar processor which predicts branch direction and executes instructions speculatively along predicted program paths.” for #performance.

• Tr2015004 cuneiform (ia800205.us.archive.org):

  #PDF #paper "Cuneiform Tablets of 2015", Kay and Nguyen, on #archival.

• Item (news.ycombinator.com):

  discussion of memory #allocators on #CHERI #security

• Index (soft-dev.org):

  #paper on #CHERI #allocators, #performance, and #security (Tratt)

• Two stories for what is CHERI (tratt.net):

  more notes by Tratt on #CHERI #allocators, #performance, and #security

• How hard is it to adapt a memory allocator to CHERI (tratt.net):

  another post about #CHERI #allocators

• (github.com):

  #yt-dlp doesn’t know how to sleep when --skip-download is in effect

• Astron Aerospace has come up with a mini engine that weighs just 35 pounds and produces 160 horsepower (topspeed.com):

  new #internal-combustion #mechanical engine design "Astron Omega 1" has a publicity video full of spelling errors

• Chronicle gdbserver (chiark.greenend.org.uk):

  "chronicle" is another #replay system with #GDB support

• Donut math (a1k0n.net):

  #pointcloud #3D #graphics #algorithms with a tiny #ASCII-art implementation in a few lines of C. #small-is-beautiful

• How much better was DEC Alpha than contemporary x86 (quora.com):

  #history of #DEC #Alpha #hardware #performance

• Quarticformula (planetmath.org):

  The quartic formula. #math

• Quartic equation (en.wikipedia.org):

  How to solve quartic equations. #math

• PDF (theswissbay.ch):

  some #ebooks about #algorithms and stuff

• Distfunctions (iquilezles.org):

  #math for #SDF #3D #graphics

• ACS Elsevier and ResearchGate resolve litigation with solution to support researchers (researchgate.net):

  ACS and Elsevier now exercise pre-publication prior restraint #censorship on ResearchGate as a settlement to their copyright lawsuit

• (lists.llvm.org):

  using multiple sanitizers on one program makes it super slow

• Jurassic (github.com):

  the "Jurassic-20" is yet another attempt to reproduce #PDP-10 #hardware on an #FPGA: “totally a playground work in progress.”

• Initial measured performance (ctsrd-cheri.github.io):

  #CHERI #Morello #hardware initial results show 15% #performance overhead on SPECint2006 for #capability-systems #security, but simulations on #FPGA suggest ways to reduce this to 1.8–3.0%.

• (exaequos.com):

  "exaequOS" is a Unix running in your browser

• Item (news.ycombinator.com):

  #exaequOS is a microkernel compiled from C to #wasm with Emscripten

• Item (news.ycombinator.com):

  discussion of writing #search-engines including a new one called "Mwmbl" (.org)

• KV10 (github.com):

  "KV10" is another attempt to simulate a #PDP-10 on an #FPGA

• (pdp10.froghouse.org):

  #KV10 is a #PDP-10 on an #FPGA, work in progress

• Pdp10X (fpgaretrocomputing.org):

  the only successful #PDP-10 on an #FPGA is the "PDP-10/X". It boots ITS.