User`s guide

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This change has been made per field request because we have
discovered that having gang scheduling on by default greatly
diminishes system performance. Most customers have been running
with it off.
• The IRIX 6.5.15 release adds a coremask parameter set in the
/var/sysgen/mtune/kernel file to determine what kind of
permissions a core file will receive. Currently, when a process creates
a core file, it uses the umask of the owner of the process to determine
the permissions. This can lead to core files containing sensitive
information being created with world readable permissions. This
systune variable allows the system administrator to limit access to
core files. The default is 0, which is the current behavior. However, if
the coremask variable is set to some other value, it uses that number
as the umask and ignores the umask of the owner of the process. For
example, if coremask is set to 0177 and the owner of the process has a
umask of 022, the permissions set on the core file will be 600 instead
of 644. This variable assumes that the number entered is octal. The
default setting is 0. The minimum setting is 0. The maximum setting
is 0177.
For more information on the coremask parameter, see Appendix A,
“IRIX Kernel Tunable Parameters”, in IRIX Admin: System
Configuration and Operation.