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#include "orbsvcs/LoadBalancing/LB_CPU_Load_Average_Monitor.h"
#include "tao/ORB_Constants.h"
#include "ace/OS_NS_time.h"
#include "ace/OS_NS_stdio.h"
#include "ace/OS_NS_unistd.h"
#include "ace/os_include/os_netdb.h"
#include "ace/os_include/sys/os_pstat.h"
#include "ace/os_include/sys/os_loadavg.h"
#if defined(__NetBSD__) || defined (__APPLE__)
#include <sys/sysctl.h>
#endif
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
TAO_LB_CPU_Load_Average_Monitor::TAO_LB_CPU_Load_Average_Monitor (
const ACE_TCHAR * location_id,
const ACE_TCHAR * 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 = 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 (ACE_TEXT_ALWAYS_CHAR(location_id));
if (location_kind != 0)
this->location_[0].kind = CORBA::string_dup (ACE_TEXT_ALWAYS_CHAR(location_kind));
}
}
TAO_LB_CPU_Load_Average_Monitor::~TAO_LB_CPU_Load_Average_Monitor ()
{
}
CosLoadBalancing::Location *
TAO_LB_CPU_Load_Average_Monitor::the_location ()
{
CosLoadBalancing::Location * location;
ACE_NEW_THROW_EX (location,
CosLoadBalancing::Location (this->location_),
CORBA::NO_MEMORY (
CORBA::SystemException::_tao_minor_code (
TAO::VMCID,
ENOMEM),
CORBA::COMPLETED_NO));
return location;
}
CosLoadBalancing::LoadList *
TAO_LB_CPU_Load_Average_Monitor::loads ()
{
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 0 // defined (_WIN32_WINNT) && (_WIN32_WINNT >= 0x0501)
SYSTEM_INFO sys_info;
::GetNativeSystemInfo (&sys_info);
if (sys_info.dwNumberOfProcessors > 0)
{
// Retrieve systimes from windows
FILETIME idle;
FILETIME kernel;
FILETIME user;
::GetSystemTimes (&idle, &kernel, &user);
// Convert all times to ULONGLONG so that we can calculate with them
ULONGLONG idle_ll = (((ULONGLONG) idle.dwHighDateTime) << 32) + idle.dwLowDateTime;
ULONGLONG kernel_ll = (((ULONGLONG) kernel.dwHighDateTime) << 32) + kernel.dwLowDateTime;
ULONGLONG user_ll = (((ULONGLONG) user.dwHighDateTime) << 32) + user.dwLowDateTime;
ULONGLONG system_ll = kernel_ll + user_ll;
// Calculate the load
load = ((system_ll - idle_ll) * 100 / system_ll) / sys_info.dwNumberOfProcessors;
}
#elif defined (ACE_LINUX)
// 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 (ACE_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 = ACE_OS::fopen ("/proc/loadavg", "r");
if (s == 0)
throw CORBA::NO_IMPLEMENT (
CORBA::SystemException::_tao_minor_code (
TAO::VMCID,
errno),
CORBA::COMPLETED_NO);
fscanf (s, "%f", &loadavg[0]);
(void) ACE_OS::fclose (s);
const int samples = 1;
# else
# if defined (ACE_LACKS_GETLOADAVG)
const int samples = 0;
# else
const int samples = ::getloadavg (loadavg, 1);
# endif /* ACE_LACKS_GETLOADAVG */
# endif /* linux
&& ((__GLIBC__ == 2 && __GLIBC_MINOR__ < 2)
|| (!_BSD_SOURCE && !_GNU_SOURCE)) */
if (samples == 1)
{
const long num_processors = ACE_OS::sysconf (_SC_NPROCESSORS_ONLN);
ACE_ASSERT (num_processors > 0);
if (num_processors > 0)
load = loadavg[0] / num_processors;
else
throw CORBA::TRANSIENT (); // Correct exception?
}
else
throw CORBA::TRANSIENT (); // Correct exception?
#elif defined (__NetBSD__) || defined (__APPLE__)
double loadavg[1];
const int samples = ::getloadavg (loadavg, 1);
if (samples == 1)
{
int mib[2], num_processors;
size_t len;
mib[0] = CTL_HW;
mib[1] = HW_NCPU;
len = sizeof(num_processors);
sysctl(mib, 2, &num_processors, &len, 0, 0);
ACE_ASSERT (num_processors > 0);
if (num_processors > 0)
load = loadavg[0] / num_processors;
else
throw CORBA::TRANSIENT (); // Correct exception?
}
else
throw CORBA::TRANSIENT (); // Correct exception?
#endif
#if defined (ACE_LINUX) || defined(__NetBSD__) || defined (__APPLE__)
CosLoadBalancing::LoadList * tmp = 0;
ACE_NEW_THROW_EX (tmp,
CosLoadBalancing::LoadList (1),
CORBA::NO_MEMORY (
CORBA::SystemException::_tao_minor_code (
TAO::VMCID,
ENOMEM),
CORBA::COMPLETED_NO));
CosLoadBalancing::LoadList_var load_list = tmp;
load_list->length (1);
load_list[0].id = CosLoadBalancing::LoadAverage;
load_list[0].value = load;
return load_list._retn ();
#else
ACE_UNUSED_ARG (load);
throw CORBA::NO_IMPLEMENT ();
#endif /* linux || __NetBSD__ || __APPLE__ */
}
TAO_END_VERSIONED_NAMESPACE_DECL
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