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#include "LB_CPU_Monitor.h"
#if defined (ACE_HAS_SYS_LOADAVG_H)
# include <sys/loadavg.h>
#endif /* ACE_HAS_SYS_LOADAVG_H */
ACE_RCSID (LoadBalancing,
LB_CPU_Monitor,
"$Id$")
TAO_LB_CPU_Monitor::TAO_LB_CPU_Monitor (const char * location_id,
const char * location_kind)
: location_ (1)
{
this->location_.length (1);
if (location_id == 0)
{
char host[MAXHOSTNAMELEN + 1];
if (ACE_OS::hostname (host, sizeof (host)) != 0)
{
// Couldn't determine hostname. Use the current time
// instead.
CORBA::ULong t = ACE_static_cast (CORBA::ULong, ACE_OS::time ());
// A 64 byte buffer is more than enough to contain the
// string representation of a 32 bit unsigned integer.
char buf[64] = { '\0' };
ACE_OS::sprintf (buf, "%u", t);
this->location_[0].id = CORBA::string_dup (buf);
this->location_[0].kind = CORBA::string_dup ("Creation Time");
}
else
{
this->location_[0].id = CORBA::string_dup (host);
this->location_[0].kind = CORBA::string_dup ("Hostname");
}
}
else
{
this->location_[0].id = CORBA::string_dup (location_id);
if (location_kind != 0)
this->location_[0].kind = CORBA::string_dup (location_kind);
}
}
TAO_LB_CPU_Monitor::~TAO_LB_CPU_Monitor (void)
{
}
CosLoadBalancing::Location *
TAO_LB_CPU_Monitor::the_location (ACE_ENV_SINGLE_ARG_DECL)
ACE_THROW_SPEC ((CORBA::SystemException))
{
CosLoadBalancing::Location * location;
ACE_NEW_THROW_EX (location,
CosLoadBalancing::Location (this->location_),
CORBA::NO_MEMORY (
CORBA::SystemException::_tao_minor_code (
TAO_DEFAULT_MINOR_CODE,
ENOMEM),
CORBA::COMPLETED_NO));
ACE_CHECK_RETURN (0);
return location;
}
CosLoadBalancing::LoadList *
TAO_LB_CPU_Monitor::loads (ACE_ENV_SINGLE_ARG_DECL)
ACE_THROW_SPEC ((CORBA::SystemException))
{
CORBA::Float load = 0;
// Obtain the number of processors each time a load is computed.
// The idea is to take into account the processor failures that can
// occur on platforms that continue running with the remaining
// processors.
//
// @@ Is this a realistic scenario? Perhaps we should just cache
// the number of processors and assume that any processor failure
// is a catastrophic one.
#if defined (WINDOWS)
SYSTEM_INFO sys_info;
::GetSystemInfo (&sys_info);
ACE_ASSERT (sys_info.dwNumberOfProcessors > 0);
load = ::GetLoadAvg () / sys_info.dwNumberOfProcessors;
#elif defined (linux) || defined (sun)
// Only bother getting the load average over the last minute.
//
// @todo Make this configurable so that the load average over the
// last 5 and 15 minutes can be used instead.
double loadavg[1];
# if defined (linux) \
&& ((defined (__GLIBC__) && defined (__GLIBC_MINOR__) \
&& __GLIBC__ == 2 && __GLIBC_MINOR__ < 2) \
|| (!defined (_BSD_SOURCE) && !defined (_GNU_SOURCE)))
// GLibc < 2.2 does not implement getloadavg(). Furthermore,
// getloadavg() is only "visible" if _BSD_SOURCE or _GNU_SOURCE is
// defined.
// Obtain the load average directly from the `/proc' filesystem.
FILE * s = ::fopen ("/proc/loadavg", "r");
if (s == 0)
ACE_THROW_RETURN (CORBA::NO_IMPLEMENT (
CORBA::SystemException::_tao_minor_code (
TAO_DEFAULT_MINOR_CODE,
errno),
CORBA::COMPLETED_NO),
0);
fscanf (s, "%f", &loadavg[0]);
(void) fclose (s);
const int samples = 1;
# else
const int samples = ::getloadavg (loadavg, 1);
# endif /* linux
&& ((__GLIBC__ == 2 && __GLIBC_MINOR__ < 2)
|| (!_BSD_SOURCE && !_GNU_SOURCE)) */
if (samples == 1)
{
const long num_processors = ::sysconf (_SC_NPROCESSORS_ONLN);
ACE_ASSERT (num_processors > 0);
if (num_processors > 0)
load = loadavg[0] / num_processors;
else
ACE_THROW_RETURN (CORBA::TRANSIENT (), 0); // Correct exception?
}
else
ACE_THROW_RETURN (CORBA::TRANSIENT (), 0); // Correct exception?
#elif defined (hpux)
struct pst_dynamic psd;
if (::pstat_getdynamic (&psd, sizeof (psd), (size_t) 1, 0) != -1)
{
const long & num_processors = psd.psd_proc_cnt;
ACE_ASSERT (num_processors > 0);
if (num_processors > 0)
load = psd.psd_avg_1_min / num_processors;
else
ACE_THROW_RETURN (CORBA::TRANSIENT (), 0); // Correct exception?
}
else
ACE_THROW_RETURN (CORBA::TRANSIENT (), 0); // Correct exception?
#endif
#if defined (WINDOWS) || defined (linux) || defined (sun) || defined (hpux)
CosLoadBalancing::LoadList * tmp;
ACE_NEW_THROW_EX (tmp,
CosLoadBalancing::LoadList (1),
CORBA::NO_MEMORY (
CORBA::SystemException::_tao_minor_code (
TAO_DEFAULT_MINOR_CODE,
ENOMEM),
CORBA::COMPLETED_NO));
ACE_CHECK_RETURN (0);
CosLoadBalancing::LoadList_var load_list = tmp;
load_list->length (1);
load_list[0].id = CosLoadBalancing::CPU;
load_list[0].value = load;
return load_list._retn ();
#else
ACE_UNUSED_ARG (load);
ACE_THROW_RETURN (CORBA::NO_IMPLEMENT (), 0);
#endif /* WINDOWS || linux || sun || hpux */
}
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