Monday, 26 August 2013

Lock-Based vs Lock-Free Concurrent Algorithms

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Last week I attended a review session of the new JSR166 StampedLock run by Heinz Kabutz at the excellent JCrete unconference. StampedLo...
50 comments:
Tuesday, 16 July 2013

Java Garbage Collection Distilled

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Serial, Parallel, Concurrent, CMS, G1, Young Gen, New Gen, Old Gen, Perm Gen, Eden, Tenured, Survivor Spaces, Safepoints, and the hundreds ...
22 comments:
Thursday, 27 June 2013

Printing Generated Assembly Code From The Hotspot JIT Compiler

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Sometimes when profiling a Java application it is necessary to understand the assembly code generated by the Hotspot JIT compiler. This can...
5 comments:
Thursday, 14 February 2013

CPU Cache Flushing Fallacy

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Even from highly experienced technologists I often hear talk about how certain operations cause a CPU cache to "flush".  This see...
29 comments:
Friday, 25 January 2013

Further Adventures With CAS Instructions And Micro Benchmarking

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In a previous article I reported what appeared to be a performance issue with CAS/LOCK instructions on the Sandy Bridge  microarchitecture...
7 comments:
Wednesday, 19 December 2012

Mechanical Sympathy Discussion Group

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Lately a number of people have suggested I start a discussion group on the subject of mechanical sympathy, so I've taken the plunge and...
3 comments:
Wednesday, 17 October 2012

Compact Off-Heap Structures/Tuples In Java

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In my last post I detailed the implications of the access patterns your code takes to main memory.  Since then I've had a lot of quest...
80 comments: