z/OS V1R9.0 UNIX System Services Command ... - Christian Grothoff

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ulimit
Usage notes
Localization
dump of memory (in 512–byte blocks) allowed for the process. A value of 0
(zero) prevents file creation. Dump file creation will stop at this limit.
–d Set or display the data size limit. The data size limit is the maximum size of
the break value for the process, in units of 1024 bytes. This resource
always has unlimited hard and soft limits.
–f Set or display the file size limit. The file size limit is the maximum file size
(in 512–byte blocks) allowed for the process. A value of 0 (zero) prevents
file creation. If the size is exceeded, a SIGXFSZ signal is sent to the
process. If the process is blocking, catching, or ignoring SIGXFSZ,
continued attempts to increase the size of a file beyond the limit will fail.
–M Set or display the amount of storage above the 2 gigabyte bar that a
process is allowed to have allocated and unhidden, in megabyte
increments. An attempt to set the storage size limit lower than the current
usage or to set the soft limit higher than the existing hard limit will fail.
Tip: The amount of storage that ulimit -M displays does not necessarily
reflect the MEMLIMIT setting found in the user’s RACF OMVS segment.
The value displayed will depend on how the user entered the OMVS shell
and whether a change of identity was performed.
–n Set or display the file descriptors limit. The file descriptors limit is the
maximum number of open file descriptors allowed for the process. This
number is one greater than the maximum value that may be assigned to a
newly created descriptor. Any function that attempts to create a new file
descriptor beyond the limit will fail. An attempt to set the open file
descriptors limit lower than that already used will fail.
–s Set or display the stack size limit. The stack size limit is the maximum size
of the stack for a process, in units of 1024 bytes. The stack is a per-thread
resource that has unlimited hard and soft limits.
–t Set or display the cpu time limit. The cpu time limit is the maximum amount
of CPU time (in seconds) allowed for the process. If the limit is exceeded, a
SIGXCPU signal is sent to the process and the process is granted a small
CPU time extension to allow for signal generation and delivery. If the
extension is used up, the process is terminated with a SIGKILL signal. An
attempt to set the CPU limit lower than that already used will fail.
num The new limit. num can be specified as “unlimited”.
1. ulimit is a built-in shell command. It cannot be used with the tcsh shell.
2. If the command fails because of an attempt to set a resource limit lower than
the current amount in use or higher than the existing hard limit, the resulting
error message may indicate an invalid argument.
ulimit uses the following localization environment variables:
v LANG
v LC_ALL
v LC_MESSAGES
v NLSPATH
See Appendix F for more information.
720 z/OS V1R9.0 UNIX System Services Command Reference