Versions Compared

Old Version 11

changes.mady.by.user Former user

Saved on

compared with

New Version Current

changes.mady.by.user Former user

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...

Note
titleImportant
  • Performance tuning requires you to modify important system files, which affect all programs running on the server. We recommend you to familiarize yourself with these files using Unix/Linux documentation before editing them.
  • The parameter values we discuss below are just examples. They might not be the optimal values for the specific hardware configurations in your environment. We recommend you to carry out load tests on your environment to tune the IS Identity Server accordingly.

OS-level settings

...

  1. To optimize network and OS performance, configure the following settings in /etc/sysctl.conf file of Linux. These settings specify a larger port range, a more effective TCP connection time-out value, and a number of other important parameters at the OS-level.

    Info

    It is not recommended to use net.ipv4.tcp_tw_recycle = 1 when working with network address translation (NAT), such as if you are deploying products in EC2 or any other environment configured with NAT.

    Code Block
    net.ipv4.tcp_fin_timeout = 30
fs.file-max = 2097152
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.core.rmem_default = 524288
net.core.wmem_default = 524288
net.core.rmem_max = 67108864
net.core.wmem_max = 67108864
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
net.ipv4.ip_local_port_range = 1024 65535

  2. To alter the number of allowed open files for system users, configure the following settings in /etc/security/limits.conf file of Linux (be sure to include the leading * character).

    Code Block
    * soft nofile 4096
* hard nofile 65535

    Optimal values for these parameters depend on the environment.

  3. To alter the maximum number of processes your user is allowed to run at a given time, configure the following settings in  /etc/security/limits.conf file of Linux (be sure to include the leading * character). Each carbon server instance you run would require upto up to 1024 threads (with default thread pool configuration). Therefore, you need to increase the nproc value by 1024 per each carbon server (both hard and soft).

    Code Block
    * soft nproc 20000
* hard nproc 20000

Setting the thread execution limit for multitenant mode

In multitenant multi-tenant mode, the Carbon runtime limits the thread execution time. That is, if a thread is stuck or taking a long time to process, Carbon detects such threads, interrupts and stops them. Note that Carbon prints the current stack trace before interrupting the thread. This mechanism is implemented as an Apache Tomcat valve. Therefore, it should be configured in the <PRODUCT_HOME>/repository/conf/tomcat/catalina-server.xml file as shown below.

...

  • The className is the Java class name used for the implementation. This must be set to org.wso2.carbon.tomcat.ext.valves.CarbonStuckThreadDetectionValve.
  • The threshold gives the minimum duration in seconds after which a thread is considered stuck. Default The default value is 600 seconds.

JVM settings

  • JVM heap size (Xmx) depends on your load. Given below are the general settings but if you are on a production environment, this might not be sufficent sufficient. In such situtaions situations, you can increase the heap size accordlinglyheap size accordingly.

    For instance, if you want to increase the JVM heap size to 4GB, open wso2server.sh located in <IS_HOME>/bin/ and do the following changes.

    -Xms2048m -Xmx2048m
    Code Block
    languagejava
    JVM_MEM_OPTS="-Xms4096m -Xmx4096m"
if [ "$java_version" \< "1.8" ]; then
	JVM_MEM_OPTS="$JVM_MEM_OPTS -XX:MaxPermSize=512m"
fi

  • When an XML element has a large number of sub-elements and the system tries to process all the sub-elements, the system can become unstable due to a memory overhead. This is a security risk.

    To avoid this issue, you can define a maximum level of entity substitutions that the XML parser allows in the system. You do this by adding the entity expansion limit attribute to the <PRODUCT_HOME>/bin/wso2server.bat file (for Windows) or the <PRODUCT_HOME>/bin/wso2server.sh file (for Linux/Solaris). The default entity expansion limit is 64000.

    Code Block
    -DentityExpansionLimit=100000set CMD_LINE_ARGS=-Xbootclasspath/a:%CARBON_XBOOTCLASSPATH% -Xms256m -Xmx1024m -XX:MaxPermSize=256m -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath="%CARBON_HOME%\repository\logs\heap-dump.hprof"  -Dcom.sun.management.jmxremote -classpath %CARBON_CLASSPATH% %JAVA_OPTS%

    In a clustered environment, the entity expansion limit has no dependency on the number of worker nodes.

...

Set up the THRIFT_SESSION database indexe index in the Identity Server database to improve performance:

...