Tuning ULIMITS

Review ULIMITS and make necessary adjustments.

Note: With TDS 6.2 and higher, ULIMITS must be configured within TDS, not the OS user. The ULIMIT setting that was previously granted to the TDS user has been moved to the TDS configuration file, ibmslapd.conf.

  1. On the TDS server, open ibmslapd.conf for editing.

    The examples that follow show the configuration file before and after the edits you are about to make.

    Example1: ibmslapd.conf file BEFORE configuration 

    dn: cn=Ulimits, cn=Configuration
cn: Ulimits
ibm-slapdUlimitDataSegment: 262144
ibm-slapdUlimitDescription: Prescribed minimum ulimit option values
ibm-slapdUlimitFileSize: 2097151
ibm-slapdUlimitNofile: 500
ibm-slapdUlimitRSS: 262144
ibm-slapdUlimitStackSize: 65536
ibm-slapdUlimitVirtualMemory: 1048576
objectclass: top
objectclass: ibm-slapdConfigUlimit
objectclass: ibm-slapdConfigEntry

    Example1: ibmslapd.conf file AFTER configuration 

    dn: cn=Ulimits, cn=Configuration
cn: Ulimits
ibm-slapdUlimitDataSegment: -1
ibm-slapdUlimitDescription: Prescribed minimum ulimit option values
ibm-slapdUlimitFileSize: -1
ibm-slapdUlimitNofile: -1
ibm-slapdUlimitRSS: -1
ibm-slapdUlimitStackSize: 65536

  2. UNIX systems only (not IBMi), adjust ULIMIT for the OS root user. When you are finished, the root user should look like the following:

    $ ulimit -a
time(seconds)        unlimited
file(blocks)         unlimited
data(kbytes)         unlimited
stack(kbytes)        32768
memory(kbytes)       unlimited
coredump(blocks)     unlimited
nofiles(descriptors) unlimited
threads(per process) unlimited
processes(per user)  unlimited