Horst @spotcodereviews

Debugging, optimization, concurrency. Fixing code so you don't have to. Writing related articles. spotcodereviews.com Austria Joined March 2021

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Ankur Kumar @ankurkumarz

4 years ago

It can't be better than this to visualize #Linux performance tools 👇 Courtesy: brendangregg.com/linuxperf.html

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That's unfortunate. SecurityManager is still useful for dynamically restricting filesystem and network access for an application-specific scope. Also useful for dynamic low-overhead filesystem tracing. The only alternative that comes to mind is bytecode instrumentation.

OpenJDK @OpenJDK

4 years ago

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Abandoned account of Thorsten Leemhuis (1/5) @kernellogger

4 years ago

All six parts from the "lockless patterns in #Linux" series @fagiolinux wrote for #LWNnet are now freely available: lwn.net/Articles/84422… "These articles will delve into the concepts behind #lockless algorithms and how they are used in the #kernel" Like this? Then subscribe!

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Horst @spotcodereviews

4 years ago

A process terminated with a segmentation fault. There's no core dump. What can you do to get to the root cause? Here's one approach to save the day. spotcodereviews.com/articles/debug…

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Roman Kennke 🗽 @rkennke

4 years ago

Project Lilliput is born 🐣 We've got a mailing list and project wiki now, code repository to appear soon. 😎openjdk.java.net/projects/lilli…

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Andrei Pangin @AndreiPangin

4 years ago

Dear OpenJDK vendors, Please enable libjvm symbols in your builds by default. For just ~2% increase in the distribution size, this greatly improves serviceability experience (1/3)

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Yoav Alon @yoavalon

6 years ago

Chrome enables PageHeap like code for a small number of allocations. Probably to find bugs is low, but since there are 1B chrome users -> bugs are bounds to be found. It's Fuzzing in production chromium.googlesource.com/chromium/src/+…

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Java Magazine @Oraclejavamag

5 years ago

Maybe. Maybe not. Still, MESI does affect the performance of #Java applications. @net0pyr social.ora.cl/6013HvVRb

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Java Magazine @Oraclejavamag

5 years ago

Easy: Knowing how caches work can drastically affect performance, says @net0pyr. #Java social.ora.cl/6013Hdetd

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Per Liden @perliden

5 years ago

ZGC | What's new in JDK 16 malloc.se/blog/zgc-jdk16

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Jeff Preshing @preshing

12 years ago

Acquire and Release Fences Don't Work the Way You'd Expect preshing.com/20131125/acqui…

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Horst @spotcodereviews

5 years ago

Tracing filesystem accesses is a common occurrence in case of debugging and there are clear answers on how to do so. What if you have a Java-based container without host access? How about a simple kind of tracing using Java? #debugging spotcodereviews.com/articles/debug…

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Horst @spotcodereviews

5 years ago

Normally, you don't need to worry about main_arena, the glibc heap root. In some debugging scenarios, though, you might even need to identify main_arena at runtime. Given it's a local symbol, how could that be done? #debugging spotcodereviews.com/articles/debug…

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Horst @spotcodereviews

5 years ago

Most of us consider the JVM heap to be static - it can grow but doesn't shrink and it never actually deallocates memory to make it available to the OS. Is that still true today? #optimization spotcodereviews.com/articles/optim…

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Horst @spotcodereviews

5 years ago

What's the difference between T, volatile T, and std::atomic<T> and why does it even matter? #concurrency spotcodereviews.com/articles/concu…

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Horst @spotcodereviews

5 years ago

The significance of sequential writes for write performance is undisputed and still relevant for SSDs. What makes a sequential write sequential, though? What are the factors involved? #optimization spotcodereviews.com/articles/optim…

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Horst @spotcodereviews

5 years ago

Log-structured filesystems like #xfs and #btrfs are increasingly commonplace, not least because they're a good fit for SSDs. Could the underlying principles also be applied to memory allocators? #optimization spotcodereviews.com/articles/optim…

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Horst @spotcodereviews

5 years ago

Most of us know about tiered compilation of the JVM, but why does the JIT seem to continually recompile methods, even after a significant process uptime? spotcodereviews.com/articles/optim… #optimization