Setting MAXDSIZ, MAXSSIZ, DFLDSIZ via kernel OIDs?

[O. Hartmann]

Hello.
Due to runtime problems of several F77 code based scientific
software I increased possible data segment size and stack by the
shown values.

options MAXDSIZ=(2048UL*1024*1024)
options MAXSSIZ=(1024UL*1024*1024)
options DFLDSIZ=(1024UL*1024*1024)

These changes implies building a new kernel and I would like to know
how I can set these parameters via kern.l OIDs (in loader.conf.local).

Thanks,
Oliver

[Dan Nelson]

In the last episode (Feb 24), O. Hartmann said:

> Due to runtime problems of several F77 code based scientific software
> I increased possible data segment size and stack by the shown values.
>
> options MAXDSIZ=(2048UL*1024*1024)
> options MAXSSIZ=(1024UL*1024*1024)
> options DFLDSIZ=(1024UL*1024*1024)
>
> These changes implies building a new kernel and I would like to know
> how I can set these parameters via kern.l OIDs (in
> loader.conf.local).

I'm sure it's documented somewhere but I find it easier to grep for the
word TUNABLE in the kernel source :) Found these in subr_param.c:

TUNABLE_QUAD_FETCH("kern.maxdsiz", &maxdsiz);
TUNABLE_QUAD_FETCH("kern.dfldsiz", &dfldsiz);
TUNABLE_QUAD_FETCH("kern.maxssiz", &maxssiz);

--
Dan Nelson
[email]dnelson@allantgroup.com[/email]