Sadiq Jaffer

Researcher @Cambridge_CL, Tech @trustedcarbon, OCaml hacker, fmr CEO at Opsian

[KC Sivaramakrishnan @kc_srk]

. @avsm and @sadiqj have been telling me about their work on geotessera.

Interesting to see embedding requests from universities and organisations around the world, from studying Indonesia's mangroves to making better maps of Greenland's west coast. https://t.co/l49tEaoMJ6.

[Sadiq Jaffer @sadiqj]

I am excited to have this opportunity to work more closely with the amazing people in the @CCI_Cambridge and @cambridge_uccri

https://t.co/xUttOZrbT7

[KC Sivaramakrishnan @kc_srk]

A cool new feature OCaml 5 version is the ability to continuously monitor production runs through low-cost "runtime event tracing" added by @sadiqj. This should enable remarkable insights into the runtime behaviour of OCaml programs.

[Anil Madhavapeddy @avsm]

Amazing, @sadiqj just landed a huge step towards multicore into OCaml trunk with the safepoints changes https://t.co/429sTExlPa

[Sadiq Jaffer @sadiqj]

@yminsky I'm not sure what the current JVM GCs do during marking but there certainly is prefetching ahead of the allocation pointer. I did some digging here: https://t.co/tNFQDZUkAG

Experiments to see how effective that trick is in OCaml has been on my TODO list for a while.

[opsianapp @opsianapp]

First blog post in our new Profiling in Production series. Learn what profiling is and how it works: https://t.co/R4BFuuspTI #performance #profiling #jvm

[opsianapp @opsianapp]

Find out how Opsian helped TransferWise fix an elusive performance problem https://t.co/mnnJb8AMKo #performance #java #jvm

[Sadiq Jaffer @sadiqj]

Great to finally announce this. Have had customers running it for over six months now and who have had huge platform-wide performance wins.

[opsianapp @opsianapp]

Announcing Continuous Allocation profiling for the Java Virtual Machine - https://t.co/Axg6yxCnbp #java #jvm #performance

[PeruJUG @perujug]

@RichardWarburto nos habla de "Continuous Profiling in Production: What, Why and How"
👉https://t.co/5PpRqGPJ9M

#JConfPeru2020

[Sadiq Jaffer @sadiqj]

Big thanks to @shipilev for his suggestions and feedback on this one

[Sadiq Jaffer @sadiqj]

New article on why Java's Thread-Local Allocation Buffers are so important and why write contention on multicore is probably worse than you might expect: https://t.co/dyvJkINDRr #java #performance #openjdk

[Sadiq Jaffer @sadiqj]

@shipilev Glad you are back home - wishing you a swift recovery.

[Sadiq Jaffer @sadiqj]

@nipafx Thanks for inviting me, was a pleasure and I learnt a fair bit. Till next time!

[Richard Warburton ☕ @RichardWarburto]

Looking forward to speaking on "Production Profiling: What, Why and How" @allthetalksconf tomorrow - 19:45 London time.

[Nicolai Parlog 🇺🇦🕊️ @nipafx]

After a not very successful first stab at benchmarking NPE performance in #Java14, I got help for a second try:

On Thursday, 23rd, at 1900 UTC, Opsian's @sadiqj will join me on stream and together we'll dig into Java 14's most thrilling feature (who said "records"? 🤨).

[Sadiq Jaffer @sadiqj]

@immad The Culture series! Persevere through Consider Phlebas - it sets the scene. The next three (Player of Games, Use of Weapons and Excession) are amazing.

[opsianapp @opsianapp]

Continuous Profiling of a JVM application in Kubernetes #java #performance #kubernetes #profiling #jvm https://t.co/wGnPQUUiEc

[Sadiq Jaffer @sadiqj]

@acmel @brendangregg Indeed - it's a great resource.

[Sadiq Jaffer @sadiqj]

Have been doing some low-level optimisation recently and discovered a few neat Linux perf tricks that are worth sharing because they were incredibly useful and helped reduce latency in some parts of the system by 10x.

[Sadiq Jaffer @sadiqj]

@acmel Looking forward to stitching lbr. Lbr was useful in cases where the dwarf information was broken - an unfortunate hazard of hacking on a compiler.

[Sadiq Jaffer @sadiqj]

@alblue I think we were capturing both at the time, restricting to just user traces is a good idea we should try again.