This is an automated email from the ASF dual-hosted git repository.
mck pushed a commit to branch cassandra-4.1
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The following commit(s) were added to refs/heads/cassandra-4.1 by this push:
new 7c86e18baf Update G1GC settings, and make it default in trunk
7c86e18baf is described below
commit 7c86e18baf10b3cf6c8f06ee9f1e27d2e21acf78
Author: Mick Semb Wever <m...@apache.org>
AuthorDate: Sat Jan 14 00:25:23 2023 +0100
Update G1GC settings, and make it default in trunk
patch by Mick Semb Wever; patch by Anthony Grasso, Brandon Williams, Derek
Chen-Becker, Jeremiah Jordan, Jon Haddad, Josh McKenzie for CASSANDRA-18027
---
NEWS.txt | 12 ++++++++++++
conf/jvm11-server.options | 4 +++-
conf/jvm8-server.options | 4 +++-
3 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/NEWS.txt b/NEWS.txt
index b48f065f0d..c1dfbd8127 100644
--- a/NEWS.txt
+++ b/NEWS.txt
@@ -51,6 +51,18 @@ restore snapshots created with the previous major version
using the
'sstableloader' tool. You can upgrade the file format of your snapshots
using the provided 'sstableupgrade' tool.
+
+4.1.1
+===
+
+G1GC Recommended
+----------------
+ - The G1 settings in jvm8-server.options and jvm11-server.options are
updated according to broad feedback
+ and testing. The G1 settings remain commented out by default in 4.1.x.
It is recommended to switch
+ to G1 for performance and for simpler GC tuning. CMS is already
deprecated in JDK9, and the next major
+ release of Cassandra makes G1 the default configuration.
+
+
4.1
===
diff --git a/conf/jvm11-server.options b/conf/jvm11-server.options
index 7e78467853..1fc3503adb 100644
--- a/conf/jvm11-server.options
+++ b/conf/jvm11-server.options
@@ -29,6 +29,8 @@
## Use the Hotspot garbage-first collector.
#-XX:+UseG1GC
#-XX:+ParallelRefProcEnabled
+#-XX:MaxTenuringThreshold=1
+#-XX:G1HeapRegionSize=16m
#
## Have the JVM do less remembered set work during STW, instead
@@ -38,7 +40,7 @@
## Main G1GC tunable: lowering the pause target will lower throughput and vise
versa.
## 200ms is the JVM default and lowest viable setting
## 1000ms increases throughput. Keep it smaller than the timeouts in
cassandra.yaml.
-#-XX:MaxGCPauseMillis=500
+#-XX:MaxGCPauseMillis=300
## Optional G1 Settings
# Save CPU time on large (>= 16GB) heaps by delaying region scanning
diff --git a/conf/jvm8-server.options b/conf/jvm8-server.options
index 6214669eab..ba800db4b4 100644
--- a/conf/jvm8-server.options
+++ b/conf/jvm8-server.options
@@ -35,6 +35,8 @@
## Use the Hotspot garbage-first collector.
#-XX:+UseG1GC
#-XX:+ParallelRefProcEnabled
+#-XX:MaxTenuringThreshold=1
+#-XX:G1HeapRegionSize=16m
#
## Have the JVM do less remembered set work during STW, instead
@@ -44,7 +46,7 @@
## Main G1GC tunable: lowering the pause target will lower throughput and vise
versa.
## 200ms is the JVM default and lowest viable setting
## 1000ms increases throughput. Keep it smaller than the timeouts in
cassandra.yaml.
-#-XX:MaxGCPauseMillis=500
+#-XX:MaxGCPauseMillis=300
## Optional G1 Settings
# Save CPU time on large (>= 16GB) heaps by delaying region scanning
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