Chapter 6. Tuning resource limits

Procedure

1. Update the performance settings:

   # dsconf -D "cn=Directory Manager" ldap://server.example.com config replace parameter_name=value

   You can set the following parameters:

   • nsslapd-threadnumber: Sets the number of worker threads.
   • nsslapd-maxdescriptors: Sets the maximum number of file descriptors.
   • nsslapd-timelimit: Sets the search time limit.
   • nsslapd-sizelimit: Sets the search size limit.
   • nsslapd-pagedsizelimit: Sets the paged search size limit.
   • nsslapd-idletimeout: Sets the idle connection timeout.
   • nsslapd-ioblocktimeout: Sets the input/output (I/O) block timeout.
   • nsslapd-ndn-cache-enabled: Enables or disables the normalized DN cache.
   • nsslapd-ndn-cache-max-size: Sets the normalized DN cache size, if nsslapd-ndn-cache-enabled is enabled.
   • nsslapd-outbound-ldap-io-timeout: Sets the outbound I/O timeout.
   • nsslapd-maxbersize: Sets the maximum Basic Encoding Rules (BER) size.
   • nsslapd-maxsasliosize: Sets the maximum Simple Authentication and Security Layer (SASL) I/O size.
   • nsslapd-listen-backlog-size: Sets the maximum number of sockets available to receive incoming connections.
   • nsslapd-max-filter-nest-level: Sets the maximum nested filter level.
   • nsslapd-ignore-virtual-attrs: Enables or disables virtual attribute lookups.
   • nsslapd-connection-nocanon: Enables or disables reverse DNS lookups.

   • nsslapd-enable-turbo-mode: Enables or disables the turbo mode feature.

     For further details, see the descriptions of the parameters in the Configuration and schema reference

2. Restart the instance:

   # dsctl instance_name restart

Procedure

1. Navigate to Server Tuning & Limits.

2. Update the settings. Optionally, click Show Advanced Settings to display all settings.

   
3. Click Save Settings.
4. Click Actions Restart Instance.

Procedure

1. Check the current status of THP:

   # cat /sys/kernel/mm/transparent_hugepage/enabled

2. If the transparent huge pages feature is active, disable it either at boot time or run time:

   • Disable the transparent huge pages at boot time by appending the following to the kernel command line in the grub.conf file:

     transparent_hugepage=never

   • Disable transparent huge pages at run time by running the following commands:

     # echo never > /sys/kernel/mm/transparent_hugepage/enabled
     # echo never > /sys/kernel/mm/transparent_hugepage/defrag