[Ngspice-users] Possible Fix for FreeBSD Memory Usage

[Thomas D. D. <to...@sp...>]

I took a quick look at baseaddr() in src/frontend/resource.c.

# uname -a
FreeBSD asus 4.8-STABLE FreeBSD 4.8-STABLE #1: Wed Aug 13 07:00:06 PDT 2003 \
    root@asus:/usr/obj/usr/src/sys/ASUS  i386

getrlimit() and getrusage() should provide a solution.

Below is a diff for src/frontend/resource.c.  This could be done
better.  Maybe use HAVE_GETRUSAGE??  I think most modern systems have
good vm management.  From man sbrk,

   The brk() and sbrk() functions are legacy interfaces from before
   the advent of modern virtual memory management.

Maybe baseaddr() and init_rlimits() could be removed and ft_ckspace()
could be written to just use getrlimit()? and getrusage()?  baseaddr()
is only used in resource.c and then only within init_rlimits().  So,
if init_rlimits() is removed, the only change outside resource.c is in
src/main.c.  I no longer have access to systems other than FreeBSD.

tomdean

30,31d29
< 
< 
35a34
> #   ifndef HAVE_GETRLIMIT
37a37
>       endif
101c101,107
<     getrlimit(RLIMIT_DATA, &rld);
---
>       struct rusage ruse;
>       long ticks, cur_use;
>     getrlimit(RLIMIT_DATA, &rld);     /* get current limit */
>     getrusage(0, &ruse);              /* get resource usage */
>       ticks=sysconf(_SC_CLK_TCK);       /* for conversion to K bytes */
>       usage=1024*ruse.ru_idrss/ticks;   /* usage is in bytes */
> 
104c110
<     limit = rld.rlim_cur - (enddata - startdata); /* rlim_max not used */
---
>     limit = rld.rlim_cur - usage; /* rlim_max not used */
110,111d115
< 
< #    endif
113a118,119
> 
> #    endif