Date: Fri, 29 Mar 2013 14:28:45 +1100 From: Peter Jeremy <peter@rulingia.com> To: Rod Person <rodperson@rodperson.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Help porting Linux app - getting Free Memory and Real Memory Message-ID: <20130329032845.GG81066@server.rulingia.com> In-Reply-To: <5156316F.9050202@rodperson.com> References: <5156316F.9050202@rodperson.com>
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On 2013-Mar-29 20:27:27 -0400, Rod Person <rodperson@rodperson.com> wrote:
>Everything is going we except that the program gives warnings that there
>isn't enough free memory on the system to perform certain actions.
That premise sounds suspiciously like the upstream author doesn't
understand how Unix VM works.
>int getSysCtl(int top_level, int next_level){
> int mib[2], ctlvalue;
> size_t len;
>
> mib[0] =3D top_level;
> mib[1] =3D next_level;
> len =3D sizeof(ctlvalue);
>
> sysctl(mib, 2, &ctlvalue, &len, NULL, 0); =20
> =20
> return ctlvalue;
>}
>
>
>int main(void){
> int realmem =3D getSysCtl(CTL_HW, HW_REALMEM);
> int usermem =3D getSysCtl(CTL_HW, HW_USERMEM);
HW_REALMEM and HW_USERMEM return an unsigned long, not an int. That
probably explains the nonsense value you are seeing in 'User Memory'.
> printf("Total VM Memory: %i\n",vmsize.t_vm);
> printf("Total Real Memory: %i\n",vmsize.t_rm);
> printf("shared real memory: %i\n",vmsize.t_rmshr);
> printf("active shared real memory: %i\n",vmsize.t_armshr);
> printf("Total Free Memory pages: %i\n",vmsize.t_free);
And these numbers are all in pages as you surmise.
--=20
Peter Jeremy
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