Jan Gray
@jangray.bsky.social
Kilocore RISC-V FPGA accelerators; former Microsoft dev tools architect; Vice-chair RISC-V SoftCPU SIG & Composable Custom Extensions Task Group; blog: https://fpga.org. Cyclist. Let's try kindness. 🇨🇦-🇺🇸
Pinned
Jan Gray
@jangray.bsky.social
· Nov 12
2GRVI Phalanx at Hot Chips 31 (2019): The First Kilocore RISC-V RV64I with High Bandwidth Memory
This week at Hot Chips 31 (2019) I am presenting a status update poster on the work-in-progress GRVI Phalanx Accelerator Kit: 2GRVI Phalanx: Towards Kilocore RISC-V FPGA Accelerators with HBM2 DRAM…
fpga.org
#FPGA #RISCV
2GRVI Phalanx at Hot Chips 31: The First Kilocore RISC-V RV64I with HBM2 High Bandwidth Memory
fpga.org/2019/08/19/2...
2GRVI Phalanx at Hot Chips 31: The First Kilocore RISC-V RV64I with HBM2 High Bandwidth Memory
fpga.org/2019/08/19/2...
My Indispensable bike touring tools: PB Swiss short allen keys, Topeak Ratchet Rocket Lite NTX, Leatherman Wave, Silca Ti lock ring tool, Topeak Power Levers
January 1, 2026 at 8:39 PM
My Indispensable bike touring tools: PB Swiss short allen keys, Topeak Ratchet Rocket Lite NTX, Leatherman Wave, Silca Ti lock ring tool, Topeak Power Levers
Reposted by Jan Gray
🧵 Starting the year with an urban adventure! @hannafloss.bsky.social and I will be riding the full length of the @sound-transit.bsky.social light rail lines 1 & 2, starting at the BelRed station. Looking forward to seeing the new stations, as well as many others we’ve never been to!
January 1, 2026 at 5:54 PM
🧵 Starting the year with an urban adventure! @hannafloss.bsky.social and I will be riding the full length of the @sound-transit.bsky.social light rail lines 1 & 2, starting at the BelRed station. Looking forward to seeing the new stations, as well as many others we’ve never been to!
Reposted by Jan Gray
Woody Guthrie’s “New Years Rulin’s” from 1943:
January 1, 2026 at 5:34 PM
Woody Guthrie’s “New Years Rulin’s” from 1943:
Reposted by Jan Gray
Canadian house party in winter 🥳
January 1, 2026 at 3:22 AM
Canadian house party in winter 🥳
THANK YOU, DUFFER BROS. ❤️
January 1, 2026 at 8:52 AM
THANK YOU, DUFFER BROS. ❤️
Good riddance to 2025. Fuck those sociopath bastards killing USAID, dooming millions of the poorest.
Presently I’m repacking my bike into this same case as in the post below. Wrenching feels good.
Keep turning the cranks and keep looking up. Be well.
Presently I’m repacking my bike into this same case as in the post below. Wrenching feels good.
Keep turning the cranks and keep looking up. Be well.
January 1, 2026 at 6:01 AM
Good riddance to 2025. Fuck those sociopath bastards killing USAID, dooming millions of the poorest.
Presently I’m repacking my bike into this same case as in the post below. Wrenching feels good.
Keep turning the cranks and keep looking up. Be well.
Presently I’m repacking my bike into this same case as in the post below. Wrenching feels good.
Keep turning the cranks and keep looking up. Be well.
Cheifet’s Computer Chronicles was a wonderful weekly show that chronicled the glorious early days of personal computing.
For many years we’d gather to watch and play along to the yearly Computer Bowl and rival or outscore the big shots on trivia.
youtu.be/f3ugQKKbUQY
Thank you, Stewart Cheifet.
For many years we’d gather to watch and play along to the yearly Computer Bowl and rival or outscore the big shots on trivia.
youtu.be/f3ugQKKbUQY
Thank you, Stewart Cheifet.
December 31, 2025 at 5:31 PM
Cheifet’s Computer Chronicles was a wonderful weekly show that chronicled the glorious early days of personal computing.
For many years we’d gather to watch and play along to the yearly Computer Bowl and rival or outscore the big shots on trivia.
youtu.be/f3ugQKKbUQY
Thank you, Stewart Cheifet.
For many years we’d gather to watch and play along to the yearly Computer Bowl and rival or outscore the big shots on trivia.
youtu.be/f3ugQKKbUQY
Thank you, Stewart Cheifet.
Reposted by Jan Gray
Hot Chips 2025 is up as well (I'm a few weeks late this year): www.youtube.com/playlist?lis...
Hot Chips 2025 - YouTube
Videos from Hot Chips 2025
www.youtube.com
December 30, 2025 at 12:58 PM
Hot Chips 2025 is up as well (I'm a few weeks late this year): www.youtube.com/playlist?lis...
How can we train the next generation of computer scientists how to think when programming, when we tolerate and thus incentivize not thinking?
My statement on teaching (looking for permanent teaching-centric gigs)
docs.google.com/document/d/1...
It really really is bad in the CS side, and I've dealt with too many faculty who are all gaga over it...
docs.google.com/document/d/1...
It really really is bad in the CS side, and I've dealt with too many faculty who are all gaga over it...
Statement on Teaching:
Statement on Teaching: Effective Programming in the Age of “AI” Nicholas Weaver nweaver@icsi.berkeley.edu https://skerry-tech.com/cv.html Computer science is not computer programming but computer p...
docs.google.com
December 29, 2025 at 3:12 PM
How can we train the next generation of computer scientists how to think when programming, when we tolerate and thus incentivize not thinking?
Reposted by Jan Gray
“By reading this plaque, you have made a valuable addition to the number of people who have read this plaque” … an important heritage moment on the streets of Toronto (by artist Sarah Lazarovic).
December 27, 2025 at 1:01 PM
“By reading this plaque, you have made a valuable addition to the number of people who have read this plaque” … an important heritage moment on the streets of Toronto (by artist Sarah Lazarovic).
TCM Remembers 2025 | TCM
YouTube video by Turner Classic Movies
www.youtube.com
December 26, 2025 at 2:57 AM
#TCMParty 😮😮😮
FYI during filming there was a Blimp (Roger Livesey as Major General Clive Wynne-Candy) joke cameo in heaven 👇
FYI during filming there was a Blimp (Roger Livesey as Major General Clive Wynne-Candy) joke cameo in heaven 👇
Wow: on FB's "Michael Powell and Emeric Pressburger, The Archers" Group, "Anonymous participant" shares clips of a 1945 newsreel & writes: "Blimp/Candy, wearing a towel, is seen striding down the ringside aisle to the amusement of the British military personnel in the [AMOLAD] audience." #tcmparty
December 26, 2025 at 1:40 AM
#TCMParty 😮😮😮
FYI during filming there was a Blimp (Roger Livesey as Major General Clive Wynne-Candy) joke cameo in heaven 👇
FYI during filming there was a Blimp (Roger Livesey as Major General Clive Wynne-Candy) joke cameo in heaven 👇
Reposted by Jan Gray
This is an almost shockingly wise essay. I'm glad I've finally read it.
There Is No Mary Problem in ‘It’s a Wonderful Life’
George’s vision of his wife without him is essential to the film, but critics continue to miss its true—and profound—meaning.
open.substack.com
December 24, 2025 at 12:34 AM
This is an almost shockingly wise essay. I'm glad I've finally read it.
Reposted by Jan Gray
IMAGINE providing all of your new nonesuch high stakes focus-craving software developers with their own OFFICE with a DOOR that closes so they can THINK and GET STUFF DONE.
An OFFICE large enough for whiteboards, bookcases, and a COUCH so they can HANG OUT or even LIE DOWN AND THINK!
An OFFICE large enough for whiteboards, bookcases, and a COUCH so they can HANG OUT or even LIE DOWN AND THINK!
July 20, 2025 at 7:16 AM
IMAGINE providing all of your new nonesuch high stakes focus-craving software developers with their own OFFICE with a DOOR that closes so they can THINK and GET STUFF DONE.
An OFFICE large enough for whiteboards, bookcases, and a COUCH so they can HANG OUT or even LIE DOWN AND THINK!
An OFFICE large enough for whiteboards, bookcases, and a COUCH so they can HANG OUT or even LIE DOWN AND THINK!
Reposted by Jan Gray
#FPGA Amazon AWS F1 machine instances, with XCVU9P FPGAs, are retired as of today, Dec. 20, 2025.
Instead use F2 instances with XCVU47P UltraScale+ HBM FPGAs (which I urged Amazon to support in 2019).
aws.amazon.com/ec2/instance...
One FPGA F2 is ~$2/hour, ~$0.62 spot. f2.48XL with 8, is 8x that.
Instead use F2 instances with XCVU47P UltraScale+ HBM FPGAs (which I urged Amazon to support in 2019).
aws.amazon.com/ec2/instance...
One FPGA F2 is ~$2/hour, ~$0.62 spot. f2.48XL with 8, is 8x that.
December 20, 2025 at 5:02 PM
#FPGA Amazon AWS F1 machine instances, with XCVU9P FPGAs, are retired as of today, Dec. 20, 2025.
Instead use F2 instances with XCVU47P UltraScale+ HBM FPGAs (which I urged Amazon to support in 2019).
aws.amazon.com/ec2/instance...
One FPGA F2 is ~$2/hour, ~$0.62 spot. f2.48XL with 8, is 8x that.
Instead use F2 instances with XCVU47P UltraScale+ HBM FPGAs (which I urged Amazon to support in 2019).
aws.amazon.com/ec2/instance...
One FPGA F2 is ~$2/hour, ~$0.62 spot. f2.48XL with 8, is 8x that.
Uh oh.
>> The #1 movie when you were 10 years old is how your 2026 is going to go.
>> The #1 movie when you were 10 years old is how your 2026 is going to go.
December 19, 2025 at 6:02 PM
Uh oh.
>> The #1 movie when you were 10 years old is how your 2026 is going to go.
>> The #1 movie when you were 10 years old is how your 2026 is going to go.
Seen shopping yesterday: exact change or no cash please.
Equal parts “cash is slower”, “we are in limbo, pennies plentiful, nickel rounding novel, don’t want to train our staff on what to do”, and “more credit/debit use affords better customer surveillance”.
Cf. www.atlantafed.org/blogs/macrob...
Equal parts “cash is slower”, “we are in limbo, pennies plentiful, nickel rounding novel, don’t want to train our staff on what to do”, and “more credit/debit use affords better customer surveillance”.
Cf. www.atlantafed.org/blogs/macrob...
December 19, 2025 at 2:00 PM
Seen shopping yesterday: exact change or no cash please.
Equal parts “cash is slower”, “we are in limbo, pennies plentiful, nickel rounding novel, don’t want to train our staff on what to do”, and “more credit/debit use affords better customer surveillance”.
Cf. www.atlantafed.org/blogs/macrob...
Equal parts “cash is slower”, “we are in limbo, pennies plentiful, nickel rounding novel, don’t want to train our staff on what to do”, and “more credit/debit use affords better customer surveillance”.
Cf. www.atlantafed.org/blogs/macrob...
Reposted by Jan Gray
=>
"JEDEC Prepares SPHBM4 Standard to Deliver HBM4-Level Throughput with Reduced Pin Count", Dec 11, 2025 www.jedec.org/news/pressre...
SPHBM4 will define 512 data signals with 4:1 serialization to achieve HBM4's bandwidth
Organic substrate routing is a longer supported channel length
"JEDEC Prepares SPHBM4 Standard to Deliver HBM4-Level Throughput with Reduced Pin Count", Dec 11, 2025 www.jedec.org/news/pressre...
SPHBM4 will define 512 data signals with 4:1 serialization to achieve HBM4's bandwidth
Organic substrate routing is a longer supported channel length
December 16, 2025 at 9:01 AM
=>
"JEDEC Prepares SPHBM4 Standard to Deliver HBM4-Level Throughput with Reduced Pin Count", Dec 11, 2025 www.jedec.org/news/pressre...
SPHBM4 will define 512 data signals with 4:1 serialization to achieve HBM4's bandwidth
Organic substrate routing is a longer supported channel length
"JEDEC Prepares SPHBM4 Standard to Deliver HBM4-Level Throughput with Reduced Pin Count", Dec 11, 2025 www.jedec.org/news/pressre...
SPHBM4 will define 512 data signals with 4:1 serialization to achieve HBM4's bandwidth
Organic substrate routing is a longer supported channel length
Solving The Problems of HBM-on-Logic
“in practicality, it requires memory vendors to redesign core parts of the product stack for, say, a specific customer, or even a specific product”
“in practicality, it requires memory vendors to redesign core parts of the product stack for, say, a specific customer, or even a specific product”
Solving The Problems of HBM-on-Logic
Future AI Accelerators Might Need To Be Slower To Be Faster
morethanmoore.substack.com
December 18, 2025 at 1:17 PM
Solving The Problems of HBM-on-Logic
“in practicality, it requires memory vendors to redesign core parts of the product stack for, say, a specific customer, or even a specific product”
“in practicality, it requires memory vendors to redesign core parts of the product stack for, say, a specific customer, or even a specific product”
And slop slog is the Sisyphean task of manually re-tweaking the slop with every churn of the model(s).
anyway, I nominate "slop" to be the @merriam-webster.com word of the year
December 17, 2025 at 1:37 PM
And slop slog is the Sisyphean task of manually re-tweaking the slop with every churn of the model(s).
Favorite so far
Initial conditions:
m1=82.9 m2=2.7 m3=8.2 (solar masses)
v1x=-6.105 v1y=6.072 v2x=-3.054 v2y=1.677 v3x=-2.638 v3y=-3.927 (km/s)
x1=2.0 y1=-7.0 x2=-5.0 y2=31.0 x3=32.0 y3=10.0 (AU from center)
Music: The Blue Danube Waltz – Strauss
m1=82.9 m2=2.7 m3=8.2 (solar masses)
v1x=-6.105 v1y=6.072 v2x=-3.054 v2y=1.677 v3x=-2.638 v3y=-3.927 (km/s)
x1=2.0 y1=-7.0 x2=-5.0 y2=31.0 x3=32.0 y3=10.0 (AU from center)
Music: The Blue Danube Waltz – Strauss
December 17, 2025 at 1:30 PM
Favorite so far
Outstanding. 🇨🇦🇨🇦🇨🇦
=>
"Reconfigurable acceleration for database systems: Taxonomy, techniques, and research challenges", Journal of Systems Architecture, Dec 3, 2025 www.sciencedirect.com/science/arti...
to survey FPGA-based database query accelerators in DBMS
27 pp, 64 ref
K. Kent scholar.google.co.in/citations?us...
"Reconfigurable acceleration for database systems: Taxonomy, techniques, and research challenges", Journal of Systems Architecture, Dec 3, 2025 www.sciencedirect.com/science/arti...
to survey FPGA-based database query accelerators in DBMS
27 pp, 64 ref
K. Kent scholar.google.co.in/citations?us...
December 17, 2025 at 1:25 PM
Outstanding. 🇨🇦🇨🇦🇨🇦
Reposted by Jan Gray
Ford closed the science centre for no reason, is shrinking it dramatically, and gov’t doesn’t want you to know the truth about this.
My column:
www.theglobeandmail.com/canada/toron...
My column:
www.theglobeandmail.com/canada/toron...
Doug Ford shrinks Ontario Science Centre to fit in temporary home at Toronto Harbourfront
The space is a fraction of the size of the original building in Don Mills, which has been closed since June, 2024
www.theglobeandmail.com
December 15, 2025 at 7:52 PM
Ford closed the science centre for no reason, is shrinking it dramatically, and gov’t doesn’t want you to know the truth about this.
My column:
www.theglobeandmail.com/canada/toron...
My column:
www.theglobeandmail.com/canada/toron...