@yardus

It's all just a good business. No lives matter.

 Prague
Joined February 2009
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So, what about that JFR context prototype I as jabbering about?! Here we go, the second part of my blog - jbachorik.github.io/posts/se… #java #jfr #jvm #performance #profiling @java @OpenJDK @datadoghq

Seeing In Context: A journey to contextualized JFR profiles (part 2)

Mostly Java/JVM stuff. Focused on serviceability, observability and performance. All opinions are my own and I am not selling any of them.

jbachorik.github.io
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Fun facts. 1. GCC has -fdiagnostics-format=json, which outputs compile errors as JSON. 2. JSON is easy to parse with python, which can easily write markdown. 3. There's a tool called mdcat, which pretty prints markdown in the terminal. Make of this information what you will.
GCC error parsed by python, output as markdown, and pretty printed with mdcat, with silly finger emojis pointing to the erroneous region.

ALT GCC error parsed by python, output as markdown, and pretty printed with mdcat, with silly finger emojis pointing to the erroneous region.

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Unable to build JMC with newer maven versions? Try disabling the http-blocker with a repo local settings file in .mvn (stackoverflow.com/questions/…)
<settings xmlns="http://maven.apache.org/SETTINGS/1.2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.2.0 http://maven.apache.org/xsd/settings-1.2.0.xsd"> <mirrors> <mirror> <id>maven-default-http-blocker</id> <mirrorOf>dummy</mirrorOf> <name>Dummy mirror to override default blocking mirror that blocks http</name> <url>http://0.0.0.0/</url> <blocked>false</blocked> </mirror> </mirrors> </settings>

ALT <settings xmlns="http://maven.apache.org/SETTINGS/1.2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.2.0 http://maven.apache.org/xsd/settings-1.2.0.xsd"> <mirrors> <mirror> <id>maven-default-http-blocker</id> <mirrorOf>dummy</mirrorOf> <name>Dummy mirror to override default blocking mirror that blocks http</name> <url>http://0.0.0.0/</url> <blocked>false</blocked> </mirror> </mirrors> </settings>

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My grandad fought those fuckers. Now they are celebrated by our 'civilised' West. I haven't been this much disgusted for a really long time ...
Ivan Katchanovski
@I_Katchanovski24 Sep 2023
This SS Galicia division veteran was also called by Canadian parliament speaker "Ukrainian hero" & "Canadian hero" & thanked "for all his service." Did anyone in Canadian parliament & government & Zelensky, who all applauded this veteran, realize that he served in Waffen SS division?
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“You cannot take any people, of any color, and exempt them from the requirements of civilization - including work, behavioral standards, personal responsibility….without ruinous consequences to them and to society at large.” - Thomas Sowell
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With Enthusiasm retweeted
Curiosity
@MAstronomers20 Sep 2023
Pluto’s Mountains, Frozen Plains and Foggy Hazes - from NASA’s New Horizons Space Probe
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Christian Humer@grashalm_19 Sep 2023
GraalVM for JDK 21/Polyglot 23.1 just landed! 🤩 GU is dead! You can now use all languages from Maven Central without barriers. This is such a big change that we felt the need to justify it with a blog post: medium.com/graalvm/truffle-u…

Truffle Unchained

Portable Language Runtimes as Java Libraries

medium.com
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Oh, jmethodid, no matter how many 'clever' checks I put around you, you always find a way to crash JVM! (I know, I know, jmethodid is not safe to store between calls but there is literally no other way to implement a profiler on JVM, FFS!)
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It is quite puzzling that jmethodids in stacktraces obtained by ASGCT seem to be much more resilient than the ones captured by the standard JVMTI calls. Why is that, I don't know ...
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Adam Bien
@AdamBien17 Sep 2023
"How BTrace Happened"--an airhacks.fm podcast conversation with @yardus about Java profilers, DTrace, Btrace a bit @netbeans jvisualvm is ready to listen: adambien.blog/roller/abien/e… #java #podcast

airhacks.fm podcast

podcast with adam bien

airhacks.fm
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Francesco Nigro@forked_franz16 Sep 2023
easyperf.net/blog/2018/01/18… old gold of a #performance investigation by @denis
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We made use of cache line alignment for context storage in Datadog’s customisation of async-profiler. In reactive applications the context can change thousands of times per thread per second, and updating the context could have become a scalability bottleneck otherwise.
Yacob (Kobi) Cohen-Arazi ✡️🇺🇲@kobi_ca15 Sep 2023
Cache Line Alignment in C++ — How It Makes Your Program Faster. by Ryonald Teofilo link.medium.com/A7cygbCj7Cb

Cache Line Alignment in C++ — How It Makes Your Program Faster.

As discussed in Memory and Data Alignment in C++, memory alignment is commonly used for optimisation. One of the methods is cache line…

link.medium.com
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DC_Draino
@DC_Draino13 Sep 2023
Mexico has revealed a never before seen picture of the average US Senator
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First part of my blog about profiling in context in Java jbachorik.github.io/posts/se… #java #jvm #jfr #profiling #performance

Seeing In Context: A journey to contextualized JFR profiles (part 1)

Mostly Java/JVM stuff. Focused on serviceability, observability and performance. All opinions are my own and I am not selling any of them.

jbachorik.github.io
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Hm, the body language of this person reminds of one Austrian guy ... Schickelgruber, was it?
This Post is from an account that no longer exists. Learn more
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Amazing
Michal Vaclavik@Kosmo_Michal10 Sep 2023
Překrásné záběry z paluby Mezinárodní kosmické stanice ISS na startující nosnou raketu Sojuz-FG s nákladní kosmickou lodí Progress MS-10 (16. listopadu 2018).
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psyv
@psyv282j9d7 Sep 2023
Replying to @lemire
Don’t 👏 tie 👏 your 👏 identity 👏 to 👏 your 👏 tools
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Debugging latency with profilers richardstartin.github.io/pos…

Understanding Request Latency with Profiling

richardstartin.github.io
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Tagir Valeev
@tagir_valeev27 Aug 2023
JVM LS 2023 videos are slowly appearing here: youtube.com/playlist?list=PL…

JVM Language Summit 2023

The JVM Language Summit is an open technical collaboration among language designers, compiler writers, tool builders, runtime engineers, and VM architects. W...

youtube.com
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