GC Tuning & Troubleshooting Crash Course | Ram Lakshmanan

After this session you will be able to say Garbage Collection tuning isn’t rocket science, it’s common sense. You will learn Key Performance Indicators (KPIs), useful tools, best practices and algorithms to tune your system’s garbage collection. Besides tuning, you will also learn how to use garbage collection metrics to troubleshoot and even forecast memory problems.
Speaker: Ram Lakshmanan (GCeasy.io & FastThread.io) | jaxlondon.com/...
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[@hp.ramesh]

Very engaging and informative. The speaker makes it real fun learning the basics of GC, without compromising clarity.

[@maulonobile]

W O W ❤️❤️❤️
This is the best video about GC and JVM fundamentals. Everybody is working with java must see it!
Thank you Ram.

[@swethapn]

Amazing presentation. Kudos Mr Ram. Would hope to see more from you.!

[@buddhikachathuranga2968]

One of the best videos I have seen saw far on GC. Thank you!!!

[@nareshgb1]

excellent talk with some practical tips.

[@prabhumurugesan9520]

Very helpful @Ram.. Excellent presentation mate !!

[@sathishspeaks]

Thanks for your genuine efforts in explaining garbage collection … thanks da thambi

[@SushilKumarBhaskar]

Excellent explanation. Hats off to you

[@preetnagadia7874]

Definitely a good video for beginners!! Thank you, Mr. Ram.

[@krishnakishorenamburi9761]

Amazing Work @Ram Lakshmanan. Keep rocking.

[@koteshwarvenigalla7150]

Beautiful presentation & explanation! Impressed!!

[@supriyamishra1886]

thank you much Ram , it is really helpful video for GC , thank you for sharing

[@chandangawri8274]

Great Talk, Crisp and to the point, Thanks for sharing...!!!

[@mallsmusic3242]

Amazing course for GC👍Thanks for sharing!!!

[@ankitbhatti667]

Quiet Insightful

[@nikhilsanghvi6109]

Very engaging and informative

[@madhusudanarao2437]

The best explanation 👍

[@jadafaysal]

Informative and impressive!

[@MrRavihr]

Excellent explanation!

[@TheProximator]

Excellent video, thanks a lot

[@billyean]

How do we turn on gclog with K8S which doesn't suggest using persistent volume at all.

[@maheshdevda6928]

The same way you would without Kubernetes. I think you can also pass JVM arguments in the deployment file. For example,
containers:
- image: tomcat:9-jre8
name: tomcat
env:
- name: JAVA_OPTS
value: "-Xlog:gc=debug:file=/tmp/gc.log:time,uptime,level,tags:filecount=5,filesize=100m"

[@diegoramos27]

The ArrayList should not be nullified if inside a thread stack (it becomes unreachable once it goes out of scope), only if it is a member variable...

[@NarenderKumarChoudhary-mj4by]

Sper Duper Amazing | best performance optimization video ever

[@user-pl5rt7rm5k]

thank you

[@DevTechPoint]

It was easy to understand the GC simple, clean explanation, it should have been more time to cover the whole slide and explanation.

[@MrMikomi]

Really good, thanks.

[@satheeshmelb]

Very good content.

[@vishnubalan7682]

35:08 JVM has the heap with it. JVM is running stuffs with it. I didnot get the part of pulling out JVM from the server (Running System.gc() in the server. How it is working).

[@ramlakshmanan5313]

Hello Vishnu! I meant that JVM can be pulled out from the Load Balancer pool. System.gc() can be triggered and then JVM can put back in to the pool. So that GC pause time will not impact customer transactions.

[@laxman20101]

I have a doubt, at 43:12 in that example, ArrayList will be increased by half of its original size right?
for example, if the initial size of the List is 10, then it would be 15, when we try to insert 11th element.

[@ramlakshmanan5313]

Hello Laxman! Greetings. ArrayList size double when it's capacity limit is reached. Say if current capacity is 10 and when you try to add 11th element, ArrayList will double up. From it's current size of 10, it will become 20. Thanks.

[@laxman20101]

@@ramlakshmanan5313 greetings!!! I just reverified. The grow method increases the list by half of its size. So it would be 15 when 11th element added. (This is for arraylist).

[@ramlakshmanan5313]

@@laxman20101 Oh good to know. What version of Java are you using? How did you verify it? Thanks.

[@laxman20101]

I have verified it using Java 8, in arraylist add method , it ensures the capacity before adding any new element. If the size exceeds it has a private method grow, which does the job of increasing the size.
newCapacity = oldCapacity + (oldCapacity >> 1)
So it would be "newCapacity = 10 + 5"

[@aravindhanskanda5384]

Really helpful. Thanks a lot

[@raushansingh9905]

I wish I could have watched a year b4

[@Krish-qn9yv]

👌

[@TehPwnerer]

On a long enough time scale, everything is garbage

[@TehPwnerer]

Implicit in my statement is that everything refers to all human stuff

[@ramlakshmanan5313]

@@TehPwnerer Can't agree more! One potential exception or long-lived object can be writing/literature/poetries ;)

[@xxxwang5574]

very good