Darryl Gove wrote: > Roland Mainz wrote: > > The cc(1) manual page says this about the "STACKSIZE" environment > > variable: > > -- snip -- > > STACKSIZE > > The executing program maintains a main memory > > stack for the master thread and distinct stacks > > for each slave thread. Stacks are temporary memory > > address spaces used to hold arguments and > > automatic variables over subprogram invocations. > > The default size of the main stack is about eight > > megabytes. Use the limit(1) command to display the > > current main stack size as well as set it. > > > > Each slave thread of a multithreaded program has > > its own thread stack. This stack mimics the main > > stack of the master thread but is unique to the > > thread. The thread's private arrays and variables > > (local to the thread) are allocated on the thread > > stack. > > > > All slave threads have the same stack size, which > > is four megabytes for 32-bit applications and > > eight megabytes for 64-bit applications by > > default. The size is set with the STACKSIZE > > environment variable. > > > > Setting the thread stack size to a value larger > > than the default may be necessary for some paral- > > lelized code. > > > > The syntax of the STACKSIZE environment variable > > accepts a keyword for denoting the slave thread > > stacksize: B for Bytes, K for Kilobytes, M for > > Megabytes, G for Gigabytes. > > > > For example, setenv STACKSIZE 8192 sets the slave > > thread stack size to 8 MB. 1235B sets the slave > > thread stack size for 1235 Bytes. 1235G sets it > > for 1235 Gigabytes. The default for an integer > > value without a suffix letter is still Kilobytes. > > -- snip -- > > > > Who or what uses "STACKSIZE" and sets it ? A quick look into the libc > > sources shows that it isn't used there... and somehow I start to suspect > > that this variable is only used for threads managed by OMP + -xparallel > > but not for the main thread or for threads created "manually" via > > |pthread_create()|, right ? > > Yup, OpenMP/autopar use this.
Where is the code (e.g. which *.a or *.o) which uses this variable ? BTW: IMO it would be nice to have less generic names for such variables, e.g. "OMP_STACKSIZE" and "AUTOPAR_STACKSIZE" (which override STACKSIZE). ---- Bye, Roland -- __ . . __ (o.\ \/ /.o) roland.mainz at nrubsig.org \__\/\/__/ MPEG specialist, C&&JAVA&&Sun&&Unix programmer /O /==\ O\ TEL +49 641 3992797 (;O/ \/ \O;)
