General I/O

rlim_fd_cur (Solaris 7 Release and Earlier)

Description

"Soft" limit on file descriptors that a single process can have open. A process might adjust its file descriptor limit to any value up to the "hard" limit defined by rlim_fd_max by using the setrlimit() call or issuing the limit command in whatever shell it is running. You do not require superuser privilege to adjust the limit to any value less than or equal to the hard limit.

Data Type

Signed integer

Default

64

Range

1 to MAXINT

Units

File descriptors

Dynamic?

No. Loaded into rlimits structure.

Validation

Compared to rlim_fd_max and if rlim_fd_cur is greater than rlim_fd_max, rlim_fd_cur is reset to rlim_fd_max.

When to Change

When the default number of open files for a process is not enough. Increasing this value means only that it is possibly not necessary for a program to use setrlimit(2) to increase the maximum number of file descriptors available to it.

Commitment Level

Unstable

segkpsize (Solaris 7 and Earlier Releases)

Description

Specify the amount of kernel pageable memory available. This memory is used primarily for kernel thread stacks. Increasing this number allows either larger stacks for the same number of threads or more threads. This parameter can only be set on 64–bit kernels. 64-bit kernels use a default stack size of 24 Kbytes.

Available for the Solaris 7 release with patch 106541-04 or the Solaris 7 5/99 and Solaris 8 releases.

Data Type

Unsigned long

Default

64–bit kernels, 2 Gbytes

32–bit kernels, 512 Mbytes

Range

64–bit kernels, 512 Mbytes - 24 Gbytes

32-bit kernels, 512 Mbytes

Units

Mbytes

Dynamic?

No

Validation

None

When to Change

Increase when more threads are desired.

Commitment Level

Unstable