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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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G1 garbage collector long pause no idea

I am trying to tune my application for responsiveness, maximum permissible GC pause is 40 ms. Couldn't understand why this pause took approx 900 ms time. Application is low latency application meant to serve high QPS. GC params: -Xmx5G -XX:+UseG1GC…
Coding Freak
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Unexplained long stop the world pauses during concurrent marking step in G1 Collector

We are experiencing unexplained/unknown long pauses (8 seconds) during concurrent marking step of G1 collector. Extract from GC-log showing problem. 2014-08-07T13:42:30.552-0400: 92183.303: [GC…
Kannan Krishnamurthy
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G1GC Log Rounding Values for Big Heaps

The G1GC logging is printing Heap occupation values as rounded to MB or GB, is there a way how to print all values in KB or MB? I want to analyze Allocation and Promotion Rates and this rounding of values introduces imprecision. For example a GC…
Aleš
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Garbage Collector - Log Analyzer for large files

I'd like to analyse a "large" G1 - Garbage Collection Logfile (appr. 500.000 lines). Therefore I'm looking for a freeware-tool which is able to open and analyze such large files. Yet I use GCViewer 1.32 but it seems that this program is not able to…
AnarchoEnte
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JDK 1.6.0_45 and G1 gc

According to this page (http://www.oracle.com/technetwork/java/javase/tech/g1-intro-jsp-135488.html) the Garbage-First (G1) garbage collector is fully supported in Oracle JDK 7 update 4 and later releases. I was wondering if anybody knows what the…
mhdwrk
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G1 garbage having one slow worker

I'm having an issue with GC pause (~400ms) which I'm trying to reduce. I noticed that I always have one worker a lot slower than others : 2013-06-03T17:24:51.606+0200: 605364.503: [GC pause (mixed) Desired survivor size 109051904 bytes, new…
Cyril S.
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JVM leaking memory when the G1 collector is used?

Has anyone had problems with the JVM (Hotspot) leaking memory when the G1 collector is used? I've fixed the heap size to 60GB (both -ms and -ms are set to 60G), but the size of the java process (according to the vsz column of the ps command) starts…
Neil
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confusions about the concurrent marking phase in G1

can't understand why there are additional young GCS during the concurrent marking phase. the doc said: While concurrent marking is running, other young-only pauses may occur, until the Remark pause (the first large orange circle), where G1…
yyh
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Java17 GC(G1) releases heap memory to Win Server 2016 despite setup of MaxHeapSize=MinHeapSize and MaxHeapFreeRatio=100

I'm using Java 17 and I've setup javaw options -Xmx16384m -Xms16384m -XX:MaxHeapFreeRatio=100 in order to avoid the release of heap memory to Win OS by GC(G1). With Win server 2008R2 it works fine but with Win 2016 (v 1607 build 14393.5989) the JVM…
IKh
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Linux OOM-Killer and G1 GC memory consumption

I have a Java application running on Liberica JDK 8 (HotSpot VM, G1 GC) on an Oracle Linux machine with 24 GB RAM. The application has -Xmx15g max heap size, utilizes it heavily (due to its load profile) and is the only process with such demands on…
Toparvion
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Why jvm increase all the time without shrink even if has -XX:MaxHeapFreeRatio jvm argument

from jmap result, we can see, free heap size(up to 90%) exceed MaxHeapFreeRatio(40%), but jvm still not shrink. this is jvm info: java.vm.name = OpenJDK 64-Bit Server VM java.vm.version = 25.352-b1 java.runtime.version = 1.8.0_352-b1 VM…
Feng
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G1GC performance tuning using GC viewer tool

We have a Spring Batch job currently having long running issue in production. On checking GC logs we have found that too many Full GC's occurring frequently. We are using G1GC collector and Java 8 version. Below are the JVM arguments: -Xms6g -Xmx20g…
bhagyac
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what are the differences between G1 young gc and mixed gc

does the mixed gc always after a young gc? what is the relationship of Mixed gc and Concurrent Marking Cycle Phases(6 Phases)? what the G1 do during the young gc?(step by step is the best) thank you as before as before as before
SmellyTrotter
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How to make G1 do periodic full GCs?

The allocated memory of our Java app (as verified using top) continuously grows as days pass, to 8 GB and more. When taking a heap dump to figure out whether there was a leak like so: jmap -dump:live,format=b,file=/tmp/myapp.hprof 17393 I noticed…
Evgeniy Berezovsky
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Elasticsearch search response pick(latency) occurs when _refresh with G1GC

Our elasticsearch cluster has 3 master nodes and 12 data nodes installed on 2 IDCs. In front of elasticsearch, there is search api server that multisearches three indexes. It shows an average response time of less than 200 ms in normal times. The…
Seong Gwon Min
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