On 05.20, Andreas Schwab wrote:
> Ben Greear <[email protected]> writes:
>
> > Chris Friesen wrote:
> >> Ben Greear wrote:
> >>
> >>> It can be helpful to know what HZ you are running at, for instance if
> >>> you care
> >>> very much about the (average) precision of a select/poll timeout.
> >> If you move the binary to a different system (or upgrade the kernel, for
> >> that matter) the assumptions can be totally wrong.
> >> This should be checked at runtime, not compile time.
> >
> > If course...that is why I like the idea of some system call or standard API
> > to get the information.
>
> sysconf(3)
>
Yup, I do it to start a thread per core.
Stupid and portable C++ code follows:
//! Node Information
__class Node {
private:
static void init();
public:
//! Node name
static char name[MAXNAMLEN];
//! Node model name
static char model[MAXNAMLEN];
//! Node hardware architecture
static char arch[MAXNAMLEN];
//! Node Operating Node name
static char osname[MAXNAMLEN];
//! Node Operating Node release
static char osrel[MAXNAMLEN];
//! Node memory
static int ram;
//! Node number of available processors
static int nproc;
};
#ifdef __UNX__
# include <unistd.h>
# ifdef sgi
# include <sys/systeminfo.h>
# include <invent.h>
# endif
# ifdef __linux__
# include <sys/sysinfo.h>
# endif
# ifdef sun
# include <sys/systeminfo.h>
# endif
# ifdef __hpux
extern "C" {
# include <sys/mpctl.h>
}
# endif
#endif
int Node::inited = 0;
char Node::name[MAXNAMLEN];
char Node::model[MAXNAMLEN];
char Node::arch[MAXNAMLEN];
char Node::osname[MAXNAMLEN];
char Node::osrel[MAXNAMLEN];
int Node::ram;
int Node::nproc;
void Node::init()
{
if (inited) return;
nproc = 1;
ram = 0;
#if defined(__UNX__)
struct utsname sys;
uname(&sys);
strcpy(name,sys.nodename);
strcpy(model,sys.machine);
strcpy(osname,sys.sysname);
strcpy(osrel,sys.release);
# ifdef sgi
sysinfo(SI_ARCHITECTURE,arch,MAXNAMLEN);
nproc = sysconf(_SC_NPROC_ONLN);
inventory_t* ip;
while (ip=getinvent())
{
if ((ip->inv_class==INV_MEMORY) && (ip->inv_type==INV_MAIN))
ram = ip->inv_state;
}
endinvent();
# endif
# ifdef sun
sysinfo(SI_ARCHITECTURE,arch,MAXNAMLEN);
nproc = sysconf(_SC_NPROCESSORS_ONLN);
ram = sysconf(_SC_PAGESIZE)*sysconf(_SC_PHYS_PAGES);
# endif
# ifdef __linux__
strcpy(arch,"x86");
nproc = sysconf(_SC_NPROCESSORS_ONLN);
if (!nproc) nproc = 1;
ram = sysconf(_SC_PAGESIZE)*sysconf(_SC_PHYS_PAGES);
# endif
# ifdef __hpux
strcpy(arch,"PA-RISC");
nproc = mpctl(MPC_GETNUMSPUS,0,0);
ram = 0; // TODO...
# endif
#elif defined(__WIN__)
DWORD len=MAXNAMLEN;
GetComputerNameA(name,&len);
strcpy(model,"Intel");
SYSTEM_INFO sys;
GetSystemInfo(&sys);
nproc = sys.dwNumberOfProcessors;
sprintf(arch,"i%d86",sys.wProcessorLevel);
MEMORYSTATUS minfo;
GlobalMemoryStatus(&minfo);
ram = minfo.dwTotalPhys;
OSVERSIONINFO osver;
osver.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
GetVersionEx(&osver);
int relmaj = osver.dwMajorVersion;
int relmin = osver.dwMinorVersion;
switch(osver.dwPlatformId)
{
case VER_PLATFORM_WIN32s:
strcpy(osname,"Win3.1");
break;
case VER_PLATFORM_WIN32_WINDOWS:
sprintf(osname,"Win9%c",(relmin>0 ? '8' : '5'));
break;
case VER_PLATFORM_WIN32_NT:
strcpy(osname,"WinNT");
break;
default:
strcpy(osname,"Win??");
}
sprintf(osrel,"%d.%d (build %d) %s",
relmaj,relmin,osver.dwBuildNumber,osver.szCSDVersion);
#else
strcpy(name,"Unknown");
strcpy(model,"Unknown");
strcpy(arch,"Unknown");
strcpy(osname,"Unknown");
strcpy(osrel,"?.?");
#endif
inited = 1;
info();
}
--
J.A. Magallon <jamagallon()able!es> \ Software is like sex:
werewolf!able!es \ It's better when it's free
Mandriva Linux release 2006.0 (Cooker) for i586
Linux 2.6.11-jam19 (gcc 4.0.0 (4.0.0-3mdk for Mandriva Linux release 2006.0))
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