mechanical-sympathy

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Welcome to the Mechanical Sympathy group. This group is for discussing how to code sympathetically for the underlying stack/platform so good performance can be extracted.

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Abhishek Agarwal, … Kirk Pepperdine16

1/2/18

JVM with 100 seconds minor GC

On Jan 2, 2018, at 9:08 AM, pboot...@gmail.com wrote: Abhishek, The fact that you are running on

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JVM with 100 seconds minor GC

On Jan 2, 2018, at 9:08 AM, pboot...@gmail.com wrote: Abhishek, The fact that you are running on

1/2/18

yang liu, … Nitsan Wakart4

9/28/17

jvm stuck in SafepointSynchronize::begin()

Thanks Alex! For future reference to all here: AFAIK lightweight-java-profiler has never progressed

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jvm stuck in SafepointSynchronize::begin()

Thanks Alex! For future reference to all here: AFAIK lightweight-java-profiler has never progressed

9/28/17

Roger Alsing, … Oleg Mazurov13

8/8/17

JVM random performance

I ran the benchmark with a profiler and was able to reproduce both modes, fast and slow. The

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JVM random performance

I ran the benchmark with a profiler and was able to reproduce both modes, fast and slow. The

8/8/17

Alexandr Nikitin, … Kirk Pepperdine9

6/5/17

Why does the G1 GC shrink number of regions?

On Jun 5, 2017, at 9:02 PM, Gil Tene <g...@azul.com> wrote: On Monday, June 5, 2017 at 9:47:56

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Why does the G1 GC shrink number of regions?

On Jun 5, 2017, at 9:02 PM, Gil Tene <g...@azul.com> wrote: On Monday, June 5, 2017 at 9:47:56

6/5/17

Дмитрий Пеньков, … Alex Bagehot9

1/29/17

you are trying to give 200 JVMs 10 core each. Before separating all 200 JVMs "see" all 80

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you are trying to give 200 JVMs 10 core each. Before separating all 200 JVMs "see" all 80

1/29/17

Gaurav Abbi, … Gil Tene5

12/21/16

Does percentile metrics follow the rules of summations?

The right way to deal with percentiles (especially when it comes to latency) is to assume nothing

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SequentialConsistency

Does percentile metrics follow the rules of summations?

The right way to deal with percentiles (especially when it comes to latency) is to assume nothing

12/21/16

11/4/16

Java 8 loop optimization puzzle

Hi all, I faced a puzzling performance behavior that seems to be link to the asm generated, I wrote a

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Java 8 loop optimization puzzle

Hi all, I faced a puzzling performance behavior that seems to be link to the asm generated, I wrote a

11/4/16

Attila-Mihaly Balazs

8/5/16

Benchmarking the cost of primitive operations on the JVM

I found the data interesting (surprising even) so I've written a post which might be of interest

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Benchmarking the cost of primitive operations on the JVM

I found the data interesting (surprising even) so I've written a post which might be of interest

8/5/16

11/10/15

Java GARBAGE_COLLECTION_NOTIFICATION Received for NOT A REAL GC with every information being ZERO

Hope anyone can enlighten me about a special garbage collection notification with all the data

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Java GARBAGE_COLLECTION_NOTIFICATION Received for NOT A REAL GC with every information being ZERO

Hope anyone can enlighten me about a special garbage collection notification with all the data

11/10/15

Ashwin Jayaprakash, … Vitaly Davidovich9

2/20/15

Is it worth clearing out local Collections/Maps after creating and populating them in a method?

Interesting. To me this sounds like some bug/anomaly in how the interpreter oopmap is built - anyone

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Is it worth clearing out local Collections/Maps after creating and populating them in a method?

Interesting. To me this sounds like some bug/anomaly in how the interpreter oopmap is built - anyone

2/20/15

Alex Rothberg, … Chris Newland9

4/27/14

Method Deoptimzations after Warmup

Hi Jimmy, (Apologies to all for the pseudo sales pitch) I've built a free and open source tool

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Method Deoptimzations after Warmup

Hi Jimmy, (Apologies to all for the pseudo sales pitch) I've built a free and open source tool

4/27/14

4/24/14

JDK Performance Regression Data

Are there any good source of JDK performance metrics (as measured by some benchmark suite) for

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JDK Performance Regression Data

Are there any good source of JDK performance metrics (as measured by some benchmark suite) for

4/24/14

Nathan Tippy, … Peter Lawrey8

3/20/14

Supporting mixed sequence of Ints and longs in Java/Android

Afaik android doesn't have intrinsics for ByteBuffer / Unsafe. This should impact performance. On

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Supporting mixed sequence of Ints and longs in Java/Android

Afaik android doesn't have intrinsics for ByteBuffer / Unsafe. This should impact performance. On

3/20/14

Ramon Nogueira, … Michael Barker13

2/2/14

Azul Zing and the GPL

Hi Ramon, > Yip, I've done this. I'll be sure to report back on what the outcome is. I don

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Azul Zing and the GPL

Hi Ramon, > Yip, I've done this. I'll be sure to report back on what the outcome is. I don

2/2/14

Andriy Plokhotnyuk, … Nitsan Wakart3

1/8/14

SALSA: Scalable and Low Synchronization NUMA-aware Algorithm for Producer-Consumer Pools

For lazy people who dont' want to reda the whole thing to find out what Martin meant ;-) "

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SALSA: Scalable and Low Synchronization NUMA-aware Algorithm for Producer-Consumer Pools

For lazy people who dont' want to reda the whole thing to find out what Martin meant ;-) "

1/8/14

Rüdiger Möller, … Jean-Philippe BEMPEL12

11/10/13

Wierd Performance Difference between int and long ...

Thanx for your clarification Jean, I am impressed :-) Am Donnerstag, 7. November 2013 21:18:24 UTC+1

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Wierd Performance Difference between int and long ...

Thanx for your clarification Jean, I am impressed :-) Am Donnerstag, 7. November 2013 21:18:24 UTC+1

11/10/13

u935903.brown.edu, … Martin Thompson12

10/24/13

conceptual tradeoffs re: use of taskset(1) to permute/pin 8xJVM grid's w CPU affinity

I know you are not recommending such practice :-) I know you well enough to know better. I just want

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conceptual tradeoffs re: use of taskset(1) to permute/pin 8xJVM grid's w CPU affinity

I know you are not recommending such practice :-) I know you well enough to know better. I just want

10/24/13

Fernando Racca, … Kirk Pepperdine36

7/25/13

Mechanically sympathetic Functional Programming

On 2013-07-25, at 4:59 PM, Gil Tene <g...@azulsystems.com> wrote: On Jul 24, 2013, at 11:59 PM,

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Mechanically sympathetic Functional Programming

On 2013-07-25, at 4:59 PM, Gil Tene <g...@azulsystems.com> wrote: On Jul 24, 2013, at 11:59 PM,

7/25/13

Michael Nitschinger, … Gil Tene7

6/24/13

Question on getting started with ASM JVM bytecode

AFAIK there is nothing that highlights assembly code by op cycles in regular HotSpot. But Zing's

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Question on getting started with ASM JVM bytecode

AFAIK there is nothing that highlights assembly code by op cycles in regular HotSpot. But Zing's

6/24/13

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