Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Remove currently undesired recommendations #291

Merged
merged 3 commits into from
Jun 4, 2021
Merged

Remove currently undesired recommendations #291

Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
b1ababa
Remove currently undesired recommendations
pega-roska May 21, 2021
c7990fa
Apply recommended changes
pega-roska May 21, 2021
867d954
add timezone
pega-roska May 25, 2021
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
23 changes: 5 additions & 18 deletions charts/pega/RecommendedJVMArgs.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,7 @@ This is the Java8+ equivalent of *PermGen* space. This space is unbounded by def
**Flag**: `-XX:MaxMetaspaceSize=SIZE` <br>
**Purpose**: Sets the maximum value the JVM Metaspace can occupy. Beyond this "Metaspace OutOfMemoryError" is thrown.<br>
**JVM default**: 18446744073709486080 Bytes or Unbounded <br>
**Pega Recommendation**: Unbounded(default), to ensure that "Metaspace OutOfMemoryError" exceptions do not occur.<br>
**Pega Recommendation**: If left Unbounded (default) then there is a risk that the kernel will run out of physical memory, and when this occurs the system will hang without an error message, and therefore will be difficult to diagnose after recovery since there will be no logging detail to investigate. Setting MaxMetaspaceSize to a minimum of 768m should be large enough to ensure that "Metaspace OutOfMemoryError" exceptions do not occur, and at the same time will prevent the kernel out of memory and resulting system hang without error messages.<br>

**Flag**: `-XX:+UseStringDeduplication` <br>
**Purpose**: Maintains a single copy of String literals *aka Deduplication*, in case multiple Strings have the same literal value<br>
Expand Down Expand Up @@ -55,21 +55,8 @@ This is the Java8+ equivalent of *PermGen* space. This space is unbounded by def
**JVM default**: No GC logs will be emitted by default.<br>
**Pega Recommendation**: Set to allow GC logs to be collected. Currently, the log rotation policy is set to 3 log files with maximum of 2MB each.<br>
<br>
##### Few more arguments:
**Flag**: `-XX:MaxGCPauseMillis=n`<br>
**Purpose**: Sets the peak pause time for GC to happen.<br>
**JVM default**: 200 milliseconds<br>
**Pega Recommendation**: Set to higher value for BATCH pods for better throughput.
<br>

**Flag**: `-XX:StringTableSize=n`<br>
**Purpose**: Sets the number of hash-buckets to be used in string pool for accommodating Strings<br>
**JVM default**: 65536, the default Hash bucket size of the JVM String pool <br>
**Pega Recommendation**: Tune this based on requirements.<br>







**Flag**: `-Duser.timezone=TIMEZONE`<br>
**Purpose**: Sets the timezone the JVM will use.<br>
**JVM default**: By default, the JVM obtains time zone from the operating system. The Pega docker image is configured to Etc/UTC.<br>
**Pega Recommendation**: Pega requires the JVM timezone to be the same as the timezone used by the database. Set this if your database is not Etc/UTC.