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Questions tagged [g1gc]

G1 or Garbage First is a generational partially collecting concurrent and parallel garbage collection algorithm. It is targeted for multi-processor machines with large memories and can meet soft realtime requirements with garbage collection (GC) pause time goals. An implementation of the G1 currently ships with the new Java 7 VMS - officially supported from JDK7 update 4.

G1 or "Garbage First" is a generational partially collecting concurrent and parallel garbage collection algorithm. It is targeted for multi-processor machines with large memories and can meet soft realtime requirements with garbage collection (GC) pause time goals.

An implementation of the G1 currently ships with the Java Hotspot 7 VM - officially supported from JDK7 update 4.

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jvm G1 ，The memory is full， full gc and fail has many many times , then throw OOM , 5min or more, cost a long time ,why?

in my demo project, 69.741: [Full GC (Allocation Failure) 1023M->1023M(1024M), 1.1631632 secs] about 30+ times, then throw OOM, about 1min. the same jvm params, the same code. in my online project(has zk, nacos,es,rabbit,actuator...) about 5min+…
perfect
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Consequences of setting G1HeapWastePercent to zero in G1

Good day , I am using G1 in production(Hotspot JDK 11) and trying to understand how it works. As far as I understand , Old GC in G1 only cleans those regions which are full of garbage, otherwise regions are put into some queue. Later on Mixed GC is…
Almas Abdrazak
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G1 problems with large heap

I've been pulled in to try to analyse gc problems for one of our installations. We're getting OOME somewhat randomly when old gen has grown a bit large. The total allocated heap is **220 GB**, running **JDK 8 (1.8.0_292-b10)**. Xms is set equal to…
Erik
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g1 gc 'Other' take a long time

G1 gc 'Other' takes a long time. What is the most possible cause and how to solve it? gc log jvm params: -XX:+UseG1GC -XX:MaxGCPauseMillis=10 -Xmx2048m -Xms2048m -Xss512k -XX:NewRatio=2 -XX:MetaspaceSize=256m -XX:MaxMetaspaceSize=512m…
wangzhiwen
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What does GarbageCollectorMXBean#getCollectionTime mean in G1GC

What does GarbageCollectorMXBean#getCollectionTime mean in G1GC. Is it the sum of pause time(time spent by STW phase) and concurrent phase or something else?
Sairam Cherupally
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Full GC is not kicking in for G1 GC in Java 11. What could be the reasons?

The JVM arguments are as follows: -Xms20g -Xmx20g -XX:MaxGCPauseMillis=10000 -XX:G1ReservePercent=30 -Duser.timezone=UTC The only thing in logs are Pause Young (Normal) (G1 Evacuation Pause) Pause Remark Pause Young (Prepare Mixed) (G1 Evacuation…
Vijay Kumar Chauhan
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long Young garbage collection pauses due to JSON loading in Java 11

In my application I have implemented a background task which reads a JSON file to memory and parses it into Java objects of relevant (specified in JSON) classes. I use Jackson to parse JSON. The JSON file is about 6MB in size. My JSON files look…
Leukonoe
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Why XX:G1HeapRegionSize in G1GC must be power of 2?

Oracle documentation https://docs.oracle.com/javase/9/gctuning/garbage-first-garbage-collector.htm#JSGCT-GUID-98E80C82-24D8-41D4-BC39-B2583F04F1FF says that XX:G1HeapRegionSize must be power of 2 but there is no restriction in setting any value…
bosekarthik
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Why is the JVM suddenly shrinking eden space and enlarging old space? (causing performance issues)

We are running 3 replicas of a java/spring boot microservice in a docker/k8s environment. After days of running without any issues one of the 3 becomes very slow due to extreme cpu usage and very high gc pauses. One specific odd metrics that caught…
Paul7979
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What's the difference between 'Survival Count' and 'Tenuring Threshold'? G1 GC

I am looking at a garbage collection report and at the bottom there is the Tenuring Summary section which contains a metric Survival Count - what is this? This is not a metric that I can explicitly see in the GC logs when adding…
Tim
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InputStream become closed (fatjar/überjar over OpenJ9_11.0.8.10 debian x64)

I'm facing a strange behavior at my enviroment. I have a fatjar of my spring application and I running it in a docker container based on adoptopenjdk/openjdk11-openj9:jdk-11.0.8_10_openj9-0.21.0-debian-slim and using the garbage collector G1GC. The…
Beto Neto
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Enable G1GC Garbage Collector

I'm trying to install Kafka in a Jetson Nano (aarch64 architecture) and i'm facing with some problems in installation. I am following the steps of the Kafka installation tutorial (Kafka Quickstart Guide) and when i execute the…
João Castilho
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WebLogic Managed server start taking more time after application deployment

i have deployed flexcube application, after the deployment my managed server startup is taking almost 50 min but still it's in starting position, i have allocated -xms16g -xmx16g g1gc, could someone help me to identify the issue, i have attached the…
Syed Rabbani
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GC1 does not release OS-Memory

I run a java application with the default Garbage Collector(G1GC). I don't get when the G1CC exactly releases memory. in htop I saw that 700M where used by the application. After I did jcmd GC.run it dropped down to about 250M. Is this meant…
user2071938
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Metaspace out of memory even 20-30% or more space free

A Keycloak/JBoss server running using Java 8 was switched to G1GC and a -XX:MaxMetaspaceSize was set to 256MB. It soon stopped responding with logs filling up with OutOfMemory: Metaspace errors. GC logs were not enabled. Server was hooked with…
Haris Mushtaq
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