Solaris Tunable Parameters Reference Manual - SCN Research

Increasing the default stack size means that almost every
kernel thread will have a larger stack, resulting in increased
kernel memory consumption for no good reason. Generally,
that space will be unused. The increased consumption means
other resources that are competing for the same pool of
memory will have the amount of space available to them
reduced, possibly decreasing the system’s ability to perform
work. Among the side effects is a reduction in the number of
threads that the kernel can create. This solution should be
treated as no more than an interim workaround until the root
cause is remedied.
Commitment Level
Unstable
lwp_default_stksize
Description
Data Type
Default
Range
Specifies the default value of the stack size to be used when a
kernel thread is created, and when the calling routine does not
provide an explicit size to be used.
Integer
■
■
■
8192 for x86 platforms
16,384 for SPARC platforms
20,480 for AMD64 platforms
Minimum is the default values:
■
■
■
3xPAGESIZE on SPARC systems
2xPAGESIZE on x86 systems
5xPAGESIZE on AMD64 systems
Maximum is 32 times the default value.
Units
Dynamic?
Validation
Bytes in multiples of the value returned by the getpagesize
parameter. For more information, see getpagesize(3C).
Yes. Affects threads created after the variable is changed.
Must be greater than or equal to 8192 and less than or equal to
262,144 (256 x 1024). Also must be a multiple of the system
page size. If these conditions are not met, the following
message is displayed:
Illegal stack size, Using N
The value of N is the default value of
lwp_default_stksize.
36 Solaris Tunable Parameters Reference Manual • June 2005