| Time |
S |
Nick |
Message |
| 08:42 |
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| 16:59 |
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shelajev |
hello everyone |
| 16:59 |
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shelajev |
how are you today? |
| 16:59 |
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| 16:59 |
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michel_slm |
hi shelajev |
| 17:00 |
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sjmaple |
we're running a couple mins late |
| 17:01 |
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| 17:01 |
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drgeb |
Ohh ok |
| 17:01 |
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drgeb |
Thanks sjmaple! |
| 17:01 |
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sjmaple |
just having a couple of backstage issues :) |
| 17:02 |
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enriquez |
hey |
| 17:03 |
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| 17:03 |
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sievemaker |
hello |
| 17:04 |
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Vinayse |
Its started yet? |
| 17:04 |
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| 17:04 |
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| 17:05 |
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shelajev |
starting in a couple of seconds, we had technical issues for a moment here |
| 17:05 |
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| 17:05 |
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ettoremaiorana |
is this going to start soon ? |
| 17:05 |
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ettoremaiorana |
right |
| 17:05 |
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sievemaker |
i hope so... |
| 17:05 |
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sievemaker |
Simon? |
| 17:05 |
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| 17:05 |
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sjmaple |
any second |
| 17:05 |
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ettoremaiorana |
ta |
| 17:05 |
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| 17:06 |
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DelGurth |
Good thing I was late, so now I'm just in time :) |
| 17:06 |
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sievemaker |
3... 2... 1... .... |
| 17:07 |
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| 17:07 |
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| 17:07 |
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shelajev |
and it's started, now we're just a youtube delay behind |
| 17:07 |
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| 17:08 |
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| 17:08 |
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shelajev |
if the video doesn't start for you, please refresh the pae |
| 17:08 |
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shelajev |
if the video doesn't start for you, please refresh the page |
| 17:08 |
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| 17:08 |
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| 17:08 |
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| 17:08 |
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| 17:08 |
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| 17:09 |
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shelajev |
and as always, if the quality of the video is not optimal, please use the cog icon on the youtube video and pick the desired quality |
| 17:09 |
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| 17:09 |
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| 17:09 |
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| 17:09 |
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shelajev |
does it work for everyone now? |
| 17:09 |
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| 17:09 |
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Sanosi |
Yes |
| 17:09 |
|
shelajev |
great, thank you! |
| 17:10 |
|
ettoremaiorana |
nope |
| 17:10 |
|
Ursula |
i cant see anything |
| 17:10 |
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| 17:10 |
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| 17:10 |
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ettoremaiorana |
refresh did the trick |
| 17:10 |
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| 17:11 |
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| 17:11 |
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| 17:11 |
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| 17:12 |
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sjmaple |
if anyone has any trouble... 1. Refresh 2. Switch browsers :) |
| 17:13 |
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| 17:13 |
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| 17:13 |
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| 17:13 |
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| 17:13 |
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sjmaple |
also, click the settings cog on the bottom right of the video to increase your video quality |
| 17:13 |
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| 17:14 |
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| 17:14 |
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| 17:14 |
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| 17:14 |
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| 17:15 |
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sjmaple |
Gil Tene gives a great session about percentiles in performance |
| 17:17 |
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| 17:22 |
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| 17:22 |
|
Sanosi |
What is compaction here, is it logging into disk? |
| 17:23 |
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| 17:24 |
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sjmaple |
thanks for q, Sanosi |
| 17:24 |
|
Sanosi |
Thank you |
| 17:25 |
|
DelGurth |
so the good old "defrag" |
| 17:25 |
|
sjmaple |
pretty much :) |
| 17:25 |
|
drgeb |
when you say move what does this really entail ? |
| 17:26 |
|
sjmaple |
copied to a congiguous chunk in memory |
| 17:26 |
|
sjmaple |
or moved to... rather |
| 17:26 |
|
sjmaple |
contiguous* |
| 17:27 |
|
shelajev |
copied to another location in memory with all the pointers updated to pointing to the new location and forgotten at the original source. |
| 17:28 |
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| 17:30 |
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| 17:30 |
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Sharma |
Is remarking not time-consuming? |
| 17:31 |
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| 17:35 |
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| 17:38 |
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sjmaple |
2048! :D |
| 17:45 |
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| 17:48 |
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| 17:55 |
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sjmaple |
I have your question on my list, Sharma... |
| 17:55 |
|
sjmaple |
any other questions for Monica as we come close to the end of the session? |
| 17:55 |
|
Sharma |
Thanks Simon |
| 17:56 |
|
Sanosi |
What tools you can recommend to finding out if the GC effect the latency or throughput of my application/protocol. For example, the tools a graphs shows how GC affect the latency ot throughput? |
| 17:56 |
|
pat13 |
what are the best sources to learn about GC, its properties and tuning,.... |
| 17:56 |
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| 17:56 |
|
Sanosi |
How to configure Java to use different GC algorithm that you mentioned today? |
| 17:57 |
|
Amitmke |
How do I determine if I should be using different GC method for my app? |
| 17:57 |
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| 17:58 |
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pat13 |
what are the possible reasons if time consumed by young gen. GC collection keeps growing and growing. what are possible approaches to investigate such problems. |
| 17:58 |
|
Sanosi |
How to obtain such this plot heap information? |
| 17:59 |
|
Sharma |
Any possibility in future of configuring GC algorithm dynamically for a specific time period - like we run lot of batch jobs on week-ends and I would prefer Throughput collector? |
| 17:59 |
|
pat13 |
having major GC every couple of hours - is this normal or rather worrying? |
| 18:00 |
|
sjmaple |
wow, lots of questions! I'll try to get through as many as I can |
| 18:00 |
|
drgeb |
Sharma interesting question, I had a smiler thought how does one handle off-peak and peak hours as far as your Application |
| 18:03 |
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| 18:04 |
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pat13 |
Is Monica working as a consultant? :) How to find the best man if a company needs help with mem.leaks or other memory issues or GC optimisation? |
| 18:07 |
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| 18:09 |
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boskoop |
How did they determine the defaults for the tuneables of the different algorithms? |
| 18:10 |
|
Ursula |
what is used for plotting |
| 18:11 |
|
pat13 |
how to switch on GC logging and keep them separate from app logs? |
| 18:11 |
|
shelajev |
@pat13, with regards to memory leaks, did you try plumbr? They could be amazing at finding the memory leaks: https://plumbr.eu/ cannot say anything about the consultancy though |
| 18:12 |
|
pat13 |
@shelajev - I know them, I started testing this app. Did you try Plumbr yourself? |
| 18:12 |
|
Ursula |
-Xloggc:/path/to/gc.log |
| 18:12 |
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pat13 |
thx ursula! you guys are better than google ;) |
| 18:12 |
|
DelGurth |
@pat13: She switched to being a consultant after working for Oracle . http://www.codekaram.com/about-us/ |
| 18:13 |
|
shelajev |
I tried it on a couple of pet projects, but not in serious production systems |
| 18:13 |
|
shelajev |
but I know the people behind it, and they are super smart :) |
| 18:14 |
|
pat13 |
@shelajev, that's my gut feeling :) I mean that they are really smart and good at what they're doing :) |
| 18:15 |
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drgeb |
What tools are there to look at the GC Logs? |
| 18:15 |
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| 18:16 |
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| 18:16 |
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| 18:16 |
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shelajev |
drgeb, they say that censum by jclarity is really nice for analytics of GC logs: https://www.jclarity.com/censum/ |
| 18:17 |
|
DelGurth |
Thanks a lot to Monica! |
| 18:17 |
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| 18:17 |
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Ursula |
@drgeb thanks is there a free one? |
| 18:18 |
|
DelGurth |
netflix listed quite some tools here: http://techblog.netflix.com/2013/05/garbage-collection-visualization.html |
| 18:19 |
|
Ursula |
Thank you! |
| 18:19 |
|
sharma |
Thanks Monica |
| 18:19 |
|
sharma |
Thanks Simon, splendid |
| 18:19 |
|
boskoop |
thx Monica! |
| 18:19 |
|
Ursula |
Thank you best Gc presentation ever ! |
| 18:19 |
|
drgeb |
Thanks awesome Session! |
| 18:20 |
|
karstensrage |
awesome talk |
| 18:20 |
|
karstensrage |
GC is way above my head but very interesting none-the-less |
| 18:20 |
|
pat13 |
yay! charts! :) |
| 18:20 |
|
* karstensrage |
is just a "it works, right?" kind of guy |
| 18:23 |
|
pat13 |
what can we learn from "unreachable objects" report? (I'm using eclipse MAT) |
| 18:28 |
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| 18:29 |
|
pat13 |
G1 is going to be a default GC for Java9, right? I read that somewhere.... |
| 18:30 |
|
pat13 |
I do! ;) |
| 18:34 |
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pat13 |
thank you Monica! :) |
| 18:54 |
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| 19:04 |
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| 20:06 |
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