llsys.cpp

/** 
 * @file llsys.cpp
 * @brief Implementation of the basic system query functions.
 *
 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "linden_common.h"

#include "llsys.h"

#include <iostream>
#ifdef LL_STANDALONE
# include <zlib.h>
#else
# include "zlib/zlib.h"
#endif

#include "llprocessor.h"
#include "llerrorcontrol.h"
#include "llevents.h"
#include "lltimer.h"
#include <boost/bind.hpp>

#if LL_WINDOWS
#	define WIN32_LEAN_AND_MEAN
#	include <winsock2.h>
#	include <windows.h>
#elif LL_DARWIN
#	include <errno.h>
#	include <sys/sysctl.h>
#	include <sys/utsname.h>
#	include <stdint.h>
#	include <Carbon/Carbon.h>
#elif LL_LINUX
#	include <errno.h>
#	include <sys/utsname.h>
#	include <unistd.h>
#	include <sys/sysinfo.h>
const char MEMINFO_FILE[] = "/proc/meminfo";
#elif LL_SOLARIS
#	include <stdio.h>
#	include <unistd.h>
#	include <sys/utsname.h>
#	define _STRUCTURED_PROC 1
#	include <sys/procfs.h>
#	include <sys/types.h>
#	include <sys/stat.h>
#	include <fcntl.h>
#	include <errno.h>
extern int errno;
#endif


static const S32 CPUINFO_BUFFER_SIZE = 16383;
LLCPUInfo gSysCPU;

// Don't log memory info any more often than this. It also serves as our
// framerate sample size.
static const F32 MEM_INFO_THROTTLE = 20;

#if LL_WINDOWS
#ifndef DLLVERSIONINFO
typedef struct _DllVersionInfo
{
    DWORD cbSize;
    DWORD dwMajorVersion;
    DWORD dwMinorVersion;
    DWORD dwBuildNumber;
    DWORD dwPlatformID;
}DLLVERSIONINFO;
#endif

#ifndef DLLGETVERSIONPROC
typedef int (FAR WINAPI *DLLGETVERSIONPROC) (DLLVERSIONINFO *);
#endif

bool get_shell32_dll_version(DWORD& major, DWORD& minor, DWORD& build_number)
{
	bool result = false;
	const U32 BUFF_SIZE = 32767;
	WCHAR tempBuf[BUFF_SIZE];
	if(GetSystemDirectory((LPWSTR)&tempBuf, BUFF_SIZE))
	{
		
		std::basic_string<WCHAR> shell32_path(tempBuf);

		// Shell32.dll contains the DLLGetVersion function. 
		// according to msdn its not part of the API
		// so you have to go in and get it.
		// http://msdn.microsoft.com/en-us/library/bb776404(VS.85).aspx
		shell32_path += TEXT("\\shell32.dll");

		HMODULE hDllInst = LoadLibrary(shell32_path.c_str());   //load the DLL
		if(hDllInst) 
		{  // Could successfully load the DLL
			DLLGETVERSIONPROC pDllGetVersion;
			/*
			You must get this function explicitly because earlier versions of the DLL
			don't implement this function. That makes the lack of implementation of the
			function a version marker in itself.
			*/
			pDllGetVersion = (DLLGETVERSIONPROC) GetProcAddress(hDllInst, 
																"DllGetVersion");

			if(pDllGetVersion) 
			{    
				// DLL supports version retrieval function
				DLLVERSIONINFO    dvi;

				ZeroMemory(&dvi, sizeof(dvi));
				dvi.cbSize = sizeof(dvi);
				HRESULT hr = (*pDllGetVersion)(&dvi);

				if(SUCCEEDED(hr)) 
				{ // Finally, the version is at our hands
					major = dvi.dwMajorVersion;
					minor = dvi.dwMinorVersion;
					build_number = dvi.dwBuildNumber;
					result = true;
				} 
			} 

			FreeLibrary(hDllInst);  // Release DLL
		} 
	}
	return result;
}
#endif // LL_WINDOWS

LLOSInfo::LLOSInfo() :
	mMajorVer(0), mMinorVer(0), mBuild(0)
{

#if LL_WINDOWS
	OSVERSIONINFOEX osvi;
	BOOL bOsVersionInfoEx;

	// Try calling GetVersionEx using the OSVERSIONINFOEX structure.
	ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
	osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
	if(!(bOsVersionInfoEx = GetVersionEx((OSVERSIONINFO *) &osvi)))
	{
		// If OSVERSIONINFOEX doesn't work, try OSVERSIONINFO.
		osvi.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
		if(!GetVersionEx( (OSVERSIONINFO *) &osvi))
			return;
	}
	mMajorVer = osvi.dwMajorVersion;
	mMinorVer = osvi.dwMinorVersion;
	mBuild = osvi.dwBuildNumber;

	DWORD shell32_major, shell32_minor, shell32_build;
	bool got_shell32_version = get_shell32_dll_version(shell32_major, 
													   shell32_minor, 
													   shell32_build);

	switch(osvi.dwPlatformId)
	{
	case VER_PLATFORM_WIN32_NT:
		{
			// Test for the product.
			if(osvi.dwMajorVersion <= 4)
			{
				mOSStringSimple = "Microsoft Windows NT ";
			}
			else if(osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 0)
			{
				mOSStringSimple = "Microsoft Windows 2000 ";
			}
			else if(osvi.dwMajorVersion ==5 && osvi.dwMinorVersion == 1)
			{
				mOSStringSimple = "Microsoft Windows XP ";
			}
			else if(osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 2)
			{
				 if(osvi.wProductType == VER_NT_WORKSTATION)
					mOSStringSimple = "Microsoft Windows XP x64 Edition ";
				 else
					mOSStringSimple = "Microsoft Windows Server 2003 ";
			}
			else if(osvi.dwMajorVersion == 6 && osvi.dwMinorVersion <= 2)
			{
				if(osvi.dwMinorVersion == 0)
				{
					if(osvi.wProductType == VER_NT_WORKSTATION)
						mOSStringSimple = "Microsoft Windows Vista ";
					else
						mOSStringSimple = "Windows Server 2008 ";
				}
				else if(osvi.dwMinorVersion == 1)
				{
					if(osvi.wProductType == VER_NT_WORKSTATION)
						mOSStringSimple = "Microsoft Windows 7 ";
					else
						mOSStringSimple = "Windows Server 2008 R2 ";
				}
				else if(osvi.dwMinorVersion == 2)
				{
					if(osvi.wProductType == VER_NT_WORKSTATION)
						mOSStringSimple = "Microsoft Windows 8 ";
					else
						mOSStringSimple = "Windows Server 2012 ";
				}

				///get native system info if available..
				typedef void (WINAPI *PGNSI)(LPSYSTEM_INFO); ///function pointer for loading GetNativeSystemInfo
				SYSTEM_INFO si; //System Info object file contains architecture info
				PGNSI pGNSI; //pointer object
				ZeroMemory(&si, sizeof(SYSTEM_INFO)); //zero out the memory in information
				pGNSI = (PGNSI) GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")),  "GetNativeSystemInfo"); //load kernel32 get function
				if(NULL != pGNSI) //check if it has failed
					pGNSI(&si); //success
				else 
					GetSystemInfo(&si); //if it fails get regular system info 
				//(Warning: If GetSystemInfo it may result in incorrect information in a WOW64 machine, if the kernel fails to load)

				//msdn microsoft finds 32 bit and 64 bit flavors this way..
				//http://msdn.microsoft.com/en-us/library/ms724429(VS.85).aspx (example code that contains quite a few more flavors
				//of windows than this code does (in case it is needed for the future)
				if ( si.wProcessorArchitecture==PROCESSOR_ARCHITECTURE_AMD64 ) //check for 64 bit
				{
					mOSStringSimple += "64-bit ";
				}
				else if (si.wProcessorArchitecture==PROCESSOR_ARCHITECTURE_INTEL )
				{
					mOSStringSimple += "32-bit ";
				}
			}
			else   // Use the registry on early versions of Windows NT.
			{
				mOSStringSimple = "Microsoft Windows (unrecognized) ";

				HKEY hKey;
				WCHAR szProductType[80];
				DWORD dwBufLen;
				RegOpenKeyEx( HKEY_LOCAL_MACHINE,
							L"SYSTEM\\CurrentControlSet\\Control\\ProductOptions",
							0, KEY_QUERY_VALUE, &hKey );
				RegQueryValueEx( hKey, L"ProductType", NULL, NULL,
								(LPBYTE) szProductType, &dwBufLen);
				RegCloseKey( hKey );
				if ( lstrcmpi( L"WINNT", szProductType) == 0 )
				{
					mOSStringSimple += "Professional ";
				}
				else if ( lstrcmpi( L"LANMANNT", szProductType) == 0 )
				{
					mOSStringSimple += "Server ";
				}
				else if ( lstrcmpi( L"SERVERNT", szProductType) == 0 )
				{
					mOSStringSimple += "Advanced Server ";
				}
			}

			std::string csdversion = utf16str_to_utf8str(osvi.szCSDVersion);
			// Display version, service pack (if any), and build number.
			std::string tmpstr;
			if(osvi.dwMajorVersion <= 4)
			{
				tmpstr = llformat("version %d.%d %s (Build %d)",
								  osvi.dwMajorVersion,
								  osvi.dwMinorVersion,
								  csdversion.c_str(),
								  (osvi.dwBuildNumber & 0xffff));
			}
			else
			{
				tmpstr = llformat("%s (Build %d)",
								  csdversion.c_str(),
								  (osvi.dwBuildNumber & 0xffff));
			}

			mOSString = mOSStringSimple + tmpstr;
		}
		break;

	case VER_PLATFORM_WIN32_WINDOWS:
		// Test for the Windows 95 product family.
		if(osvi.dwMajorVersion == 4 && osvi.dwMinorVersion == 0)
		{
			mOSStringSimple = "Microsoft Windows 95 ";
			if ( osvi.szCSDVersion[1] == 'C' || osvi.szCSDVersion[1] == 'B' )
			{
                mOSStringSimple += "OSR2 ";
			}
		} 
		if(osvi.dwMajorVersion == 4 && osvi.dwMinorVersion == 10)
		{
			mOSStringSimple = "Microsoft Windows 98 ";
			if ( osvi.szCSDVersion[1] == 'A' )
			{
                mOSStringSimple += "SE ";
			}
		} 
		if(osvi.dwMajorVersion == 4 && osvi.dwMinorVersion == 90)
		{
			mOSStringSimple = "Microsoft Windows Millennium Edition ";
		}
		mOSString = mOSStringSimple;
		break;
	}

	std::string compatibility_mode;
	if(got_shell32_version)
	{
		if(osvi.dwMajorVersion != shell32_major || osvi.dwMinorVersion != shell32_minor)
		{
			compatibility_mode = llformat(" compatibility mode. real ver: %d.%d (Build %d)", 
											shell32_major,
											shell32_minor,
											shell32_build);
		}
	}
	mOSString += compatibility_mode;

#elif LL_DARWIN
	
	// Initialize mOSStringSimple to something like:
	// "Mac OS X 10.6.7"
	{
		const char * DARWIN_PRODUCT_NAME = "Mac OS X";
		
		SInt32 major_version, minor_version, bugfix_version;
		OSErr r1 = Gestalt(gestaltSystemVersionMajor, &major_version);
		OSErr r2 = Gestalt(gestaltSystemVersionMinor, &minor_version);
		OSErr r3 = Gestalt(gestaltSystemVersionBugFix, &bugfix_version);

		if((r1 == noErr) && (r2 == noErr) && (r3 == noErr))
		{
			mMajorVer = major_version;
			mMinorVer = minor_version;
			mBuild = bugfix_version;

			std::stringstream os_version_string;
			os_version_string << DARWIN_PRODUCT_NAME << " " << mMajorVer << "." << mMinorVer << "." << mBuild;
			
			// Put it in the OS string we are compiling
			mOSStringSimple.append(os_version_string.str());
		}
		else
		{
			mOSStringSimple.append("Unable to collect OS info");
		}
	}
	
	// Initialize mOSString to something like:
	// "Mac OS X 10.6.7 Darwin Kernel Version 10.7.0: Sat Jan 29 15:17:16 PST 2011; root:xnu-1504.9.37~1/RELEASE_I386 i386"
	struct utsname un;
	if(uname(&un) != -1)
	{		
		mOSString = mOSStringSimple;
		mOSString.append(" ");
		mOSString.append(un.sysname);
		mOSString.append(" ");
		mOSString.append(un.release);
		mOSString.append(" ");
		mOSString.append(un.version);
		mOSString.append(" ");
		mOSString.append(un.machine);
	}
	else
	{
		mOSString = mOSStringSimple;
	}
	
#else
	
	struct utsname un;
	if(uname(&un) != -1)
	{
		mOSStringSimple.append(un.sysname);
		mOSStringSimple.append(" ");
		mOSStringSimple.append(un.release);

		mOSString = mOSStringSimple;
		mOSString.append(" ");
		mOSString.append(un.version);
		mOSString.append(" ");
		mOSString.append(un.machine);

		// Simplify 'Simple'
		std::string ostype = mOSStringSimple.substr(0, mOSStringSimple.find_first_of(" ", 0));
		if (ostype == "Linux")
		{
			// Only care about major and minor Linux versions, truncate at second '.'
			std::string::size_type idx1 = mOSStringSimple.find_first_of(".", 0);
			std::string::size_type idx2 = (idx1 != std::string::npos) ? mOSStringSimple.find_first_of(".", idx1+1) : std::string::npos;
			std::string simple = mOSStringSimple.substr(0, idx2);
			if (simple.length() > 0)
				mOSStringSimple = simple;
		}
	}
	else
	{
		mOSStringSimple.append("Unable to collect OS info");
		mOSString = mOSStringSimple;
	}
#endif

}

#ifndef LL_WINDOWS
// static
S32 LLOSInfo::getMaxOpenFiles()
{
	const S32 OPEN_MAX_GUESS = 256;

#ifdef	OPEN_MAX
	static S32 open_max = OPEN_MAX;
#else
	static S32 open_max = 0;
#endif

	if (0 == open_max)
	{
		// First time through.
		errno = 0;
		if ( (open_max = sysconf(_SC_OPEN_MAX)) < 0)
		{
			if (0 == errno)
			{
				// Indeterminate.
				open_max = OPEN_MAX_GUESS;
			}
			else
			{
				llerrs << "LLOSInfo::getMaxOpenFiles: sysconf error for _SC_OPEN_MAX" << llendl;
			}
		}
	}
	return open_max;
}
#endif

void LLOSInfo::stream(std::ostream& s) const
{
	s << mOSString;
}

const std::string& LLOSInfo::getOSString() const
{
	return mOSString;
}

const std::string& LLOSInfo::getOSStringSimple() const
{
	return mOSStringSimple;
}

const S32 STATUS_SIZE = 8192;

//static
U32 LLOSInfo::getProcessVirtualSizeKB()
{
	U32 virtual_size = 0;
#if LL_WINDOWS
#endif
#if LL_LINUX
	LLFILE* status_filep = LLFile::fopen("/proc/self/status", "rb");
	if (status_filep)
	{
		S32 numRead = 0;		
		char buff[STATUS_SIZE];		/* Flawfinder: ignore */

		size_t nbytes = fread(buff, 1, STATUS_SIZE-1, status_filep);
		buff[nbytes] = '\0';

		// All these guys return numbers in KB
		char *memp = strstr(buff, "VmSize:");
		if (memp)
		{
			numRead += sscanf(memp, "%*s %u", &virtual_size);
		}
		fclose(status_filep);
	}
#elif LL_SOLARIS
	char proc_ps[LL_MAX_PATH];
	sprintf(proc_ps, "/proc/%d/psinfo", (int)getpid());
	int proc_fd = -1;
	if((proc_fd = open(proc_ps, O_RDONLY)) == -1){
		llwarns << "unable to open " << proc_ps << llendl;
		return 0;
	}
	psinfo_t proc_psinfo;
	if(read(proc_fd, &proc_psinfo, sizeof(psinfo_t)) != sizeof(psinfo_t)){
		llwarns << "Unable to read " << proc_ps << llendl;
		close(proc_fd);
		return 0;
	}

	close(proc_fd);

	virtual_size = proc_psinfo.pr_size;
#endif
	return virtual_size;
}

//static
U32 LLOSInfo::getProcessResidentSizeKB()
{
	U32 resident_size = 0;
#if LL_WINDOWS
#endif
#if LL_LINUX
	LLFILE* status_filep = LLFile::fopen("/proc/self/status", "rb");
	if (status_filep != NULL)
	{
		S32 numRead = 0;
		char buff[STATUS_SIZE];		/* Flawfinder: ignore */

		size_t nbytes = fread(buff, 1, STATUS_SIZE-1, status_filep);
		buff[nbytes] = '\0';

		// All these guys return numbers in KB
		char *memp = strstr(buff, "VmRSS:");
		if (memp)
		{
			numRead += sscanf(memp, "%*s %u", &resident_size);
		}
		fclose(status_filep);
	}
#elif LL_SOLARIS
	char proc_ps[LL_MAX_PATH];
	sprintf(proc_ps, "/proc/%d/psinfo", (int)getpid());
	int proc_fd = -1;
	if((proc_fd = open(proc_ps, O_RDONLY)) == -1){
		llwarns << "unable to open " << proc_ps << llendl;
		return 0;
	}
	psinfo_t proc_psinfo;
	if(read(proc_fd, &proc_psinfo, sizeof(psinfo_t)) != sizeof(psinfo_t)){
		llwarns << "Unable to read " << proc_ps << llendl;
		close(proc_fd);
		return 0;
	}

	close(proc_fd);

	resident_size = proc_psinfo.pr_rssize;
#endif
	return resident_size;
}

LLCPUInfo::LLCPUInfo()
{
	std::ostringstream out;
	LLProcessorInfo proc;
	// proc.WriteInfoTextFile("procInfo.txt");
	mHasSSE = proc.hasSSE();
	mHasSSE2 = proc.hasSSE2();
	mHasAltivec = proc.hasAltivec();
	mCPUMHz = (F64)proc.getCPUFrequency();
	mFamily = proc.getCPUFamilyName();
	mCPUString = "Unknown";

	out << proc.getCPUBrandName();
	if (200 < mCPUMHz && mCPUMHz < 10000)           // *NOTE: cpu speed is often way wrong, do a sanity check
	{
		out << " (" << mCPUMHz << " MHz)";
	}
	mCPUString = out.str();
}

bool LLCPUInfo::hasAltivec() const
{
	return mHasAltivec;
}

bool LLCPUInfo::hasSSE() const
{
	return mHasSSE;
}

bool LLCPUInfo::hasSSE2() const
{
	return mHasSSE2;
}

F64 LLCPUInfo::getMHz() const
{
	return mCPUMHz;
}

std::string LLCPUInfo::getCPUString() const
{
	return mCPUString;
}

void LLCPUInfo::stream(std::ostream& s) const
{
	// gather machine information.
	s << LLProcessorInfo().getCPUFeatureDescription();

	// These are interesting as they reflect our internal view of the
	// CPU's attributes regardless of platform
	s << "->mHasSSE:     " << (U32)mHasSSE << std::endl;
	s << "->mHasSSE2:    " << (U32)mHasSSE2 << std::endl;
	s << "->mHasAltivec: " << (U32)mHasAltivec << std::endl;
	s << "->mCPUMHz:     " << mCPUMHz << std::endl;
	s << "->mCPUString:  " << mCPUString << std::endl;
}

LLMemoryInfo::LLMemoryInfo()
{
}

#if LL_WINDOWS
static U32 LLMemoryAdjustKBResult(U32 inKB)
{
	// Moved this here from llfloaterabout.cpp

	//! \bug
	// For some reason, the reported amount of memory is always wrong.
	// The original adjustment assumes it's always off by one meg, however
	// errors of as much as 2520 KB have been observed in the value
	// returned from the GetMemoryStatusEx function.  Here we keep the
	// original adjustment from llfoaterabout.cpp until this can be
	// fixed somehow.
	inKB += 1024;

	return inKB;
}
#endif

U32 LLMemoryInfo::getPhysicalMemoryKB() const
{
#if LL_WINDOWS
	MEMORYSTATUSEX state;
	state.dwLength = sizeof(state);
	GlobalMemoryStatusEx(&state);

	return LLMemoryAdjustKBResult((U32)(state.ullTotalPhys >> 10));

#elif LL_DARWIN
	// This might work on Linux as well.  Someone check...
	uint64_t phys = 0;
	int mib[2] = { CTL_HW, HW_MEMSIZE };

	size_t len = sizeof(phys);	
	sysctl(mib, 2, &phys, &len, NULL, 0);
	
	return (U32)(phys >> 10);

#elif LL_LINUX
	U64 phys = 0;
	phys = (U64)(getpagesize()) * (U64)(get_phys_pages());
	return (U32)(phys >> 10);

#elif LL_SOLARIS
	U64 phys = 0;
	phys = (U64)(getpagesize()) * (U64)(sysconf(_SC_PHYS_PAGES));
	return (U32)(phys >> 10);

#else
	return 0;

#endif
}

U32 LLMemoryInfo::getPhysicalMemoryClamped() const
{
	// Return the total physical memory in bytes, but clamp it
	// to no more than U32_MAX
	
	U32 phys_kb = getPhysicalMemoryKB();
	if (phys_kb >= 4194304 /* 4GB in KB */)
	{
		return U32_MAX;
	}
	else
	{
		return phys_kb << 10;
	}
}

//static
void LLMemoryInfo::getAvailableMemoryKB(U32& avail_physical_mem_kb, U32& avail_virtual_mem_kb)
{
#if LL_WINDOWS
	MEMORYSTATUSEX state;
	state.dwLength = sizeof(state);
	GlobalMemoryStatusEx(&state);

	avail_physical_mem_kb = (U32)(state.ullAvailPhys/1024) ;
	avail_virtual_mem_kb = (U32)(state.ullAvailVirtual/1024) ;

#elif LL_DARWIN
	// Run vm_stat and filter output, scaling for page size:
	// $ vm_stat
	// Mach Virtual Memory Statistics: (page size of 4096 bytes)
	// Pages free:                   462078.
	// Pages active:                 142010.
	// Pages inactive:               220007.
	// Pages wired down:             159552.
	// "Translation faults":      220825184.
	// Pages copy-on-write:         2104153.
	// Pages zero filled:         167034876.
	// Pages reactivated:             65153.
	// Pageins:                     2097212.
	// Pageouts:                      41759.
	// Object cache: 841598 hits of 7629869 lookups (11% hit rate)
	avail_physical_mem_kb = -1 ;
	avail_virtual_mem_kb = -1 ;

#elif LL_LINUX
	// Read selected lines from MEMINFO_FILE:
	// $ cat /proc/meminfo
	// MemTotal:        4108424 kB
	// MemFree:         1244064 kB
	// Buffers:           85164 kB
	// Cached:          1990264 kB
	// SwapCached:            0 kB
	// Active:          1176648 kB
	// Inactive:        1427532 kB
	// Active(anon):     529152 kB
	// Inactive(anon):    15924 kB
	// Active(file):     647496 kB
	// Inactive(file):  1411608 kB
	// Unevictable:          16 kB
	// Mlocked:              16 kB
	// HighTotal:       3266316 kB
	// HighFree:         721308 kB
	// LowTotal:         842108 kB
	// LowFree:          522756 kB
	// SwapTotal:       6384632 kB
	// SwapFree:        6384632 kB
	// Dirty:                28 kB
	// Writeback:             0 kB
	// AnonPages:        528820 kB
	// Mapped:            89472 kB
	// Shmem:             16324 kB
	// Slab:             159624 kB
	// SReclaimable:     145168 kB
	// SUnreclaim:        14456 kB
	// KernelStack:        2560 kB
	// PageTables:         5560 kB
	// NFS_Unstable:          0 kB
	// Bounce:                0 kB
	// WritebackTmp:          0 kB
	// CommitLimit:     8438844 kB
	// Committed_AS:    1271596 kB
	// VmallocTotal:     122880 kB
	// VmallocUsed:       65252 kB
	// VmallocChunk:      52356 kB
	// HardwareCorrupted:     0 kB
	// HugePages_Total:       0
	// HugePages_Free:        0
	// HugePages_Rsvd:        0
	// HugePages_Surp:        0
	// Hugepagesize:       2048 kB
	// DirectMap4k:      434168 kB
	// DirectMap2M:      477184 kB
	// (could also run 'free', but easier to read a file than run a program)
	avail_physical_mem_kb = -1 ;
	avail_virtual_mem_kb = -1 ;

#else
	//do not know how to collect available memory info for other systems.
	//leave it blank here for now.

	avail_physical_mem_kb = -1 ;
	avail_virtual_mem_kb = -1 ;
#endif
}

void LLMemoryInfo::stream(std::ostream& s) const
{
	// We want these memory stats to be easy to grep from the log, along with
	// the timestamp. So preface each line with the timestamp and a
	// distinctive marker. Without that, we'd have to search the log for the
	// introducer line, then read subsequent lines, etc...
	std::string pfx(LLError::utcTime() + " <mem> ");

#if LL_WINDOWS
	MEMORYSTATUSEX state;
	state.dwLength = sizeof(state);
	GlobalMemoryStatusEx(&state);

	s << pfx << "Percent Memory use: " << (U32)state.dwMemoryLoad << '%' << std::endl;
	s << pfx << "Total Physical KB:  " << (U32)(state.ullTotalPhys/1024) << std::endl;
	s << pfx << "Avail Physical KB:  " << (U32)(state.ullAvailPhys/1024) << std::endl;
	s << pfx << "Total page KB:      " << (U32)(state.ullTotalPageFile/1024) << std::endl;
	s << pfx << "Avail page KB:      " << (U32)(state.ullAvailPageFile/1024) << std::endl;
	s << pfx << "Total Virtual KB:   " << (U32)(state.ullTotalVirtual/1024) << std::endl;
	s << pfx << "Avail Virtual KB:   " << (U32)(state.ullAvailVirtual/1024) << std::endl;

#elif LL_DARWIN
	uint64_t phys = 0;

	size_t len = sizeof(phys);	
	
	if(sysctlbyname("hw.memsize", &phys, &len, NULL, 0) == 0)
	{
		s << pfx << "Total Physical KB:  " << phys/1024 << std::endl;
	}
	else
	{
		s << "Unable to collect hw.memsize memory information" << std::endl;
	}

	FILE* pout = popen("vm_stat 2>&1", "r");
	if (! pout)
	{
		s << "Unable to collect vm_stat memory information" << std::endl;
	}
	else
	{
		// Here 'pout' is vm_stat's stdout. Copy it to output stream.
		char line[100];
		while (fgets(line, sizeof(line), pout))
		{
			s << pfx << line;
		}
		fclose(pout);
	}

#elif LL_SOLARIS
        U64 phys = 0;

        phys = (U64)(sysconf(_SC_PHYS_PAGES)) * (U64)(sysconf(_SC_PAGESIZE)/1024);

        s << pfx << "Total Physical KB:  " << phys << std::endl;

#elif LL_LINUX
	LLFILE* meminfo = LLFile::fopen(MEMINFO_FILE,"rb");
	if(meminfo)
	{
		char line[MAX_STRING];		/* Flawfinder: ignore */
		memset(line, 0, sizeof(line));
		while(fgets(line, sizeof(line), meminfo))
		{
			line[strlen(line)-1] = ' ';		 /*Flawfinder: ignore*/
			s << pfx << line;
		}
		fclose(meminfo);
	}
	else
	{
		s << "Unable to collect memory information" << std::endl;
	}

#else
	s << "Unknown system; unable to collect memory information" << std::endl;

#endif
}

std::ostream& operator<<(std::ostream& s, const LLOSInfo& info)
{
	info.stream(s);
	return s;
}

std::ostream& operator<<(std::ostream& s, const LLCPUInfo& info)
{
	info.stream(s);
	return s;
}

std::ostream& operator<<(std::ostream& s, const LLMemoryInfo& info)
{
	info.stream(s);
	return s;
}

class FrameWatcher
{
public:
    FrameWatcher():
        // Hooking onto the "mainloop" event pump gets us one call per frame.
        mConnection(LLEventPumps::instance()
                    .obtain("mainloop")
                    .listen("FrameWatcher", boost::bind(&FrameWatcher::tick, this, _1))),
        // Initializing mSampleStart to an invalid timestamp alerts us to skip
        // trying to compute framerate on the first call.
        mSampleStart(-1),
        // Initializing mSampleEnd to 0 ensures that we treat the first call
        // as the completion of a sample window.
        mSampleEnd(0),
        mFrames(0),
        // Initializing to F32_MAX means that the first real frame will become
        // the slowest ever, which sounds like a good idea.
        mSlowest(F32_MAX),
        mDesc("startup")
    {}

    bool tick(const LLSD&)
    {
        F32 timestamp(mTimer.getElapsedTimeF32());

        // Count this frame in the interval just completed.
        ++mFrames;

        // Have we finished a sample window yet?
        if (timestamp < mSampleEnd)
        {
            // no, just keep waiting
            return false;
        }

        // Set up for next sample window. Capture values for previous frame in
        // local variables and reset data members.
        U32 frames(mFrames);
        F32 sampleStart(mSampleStart);
        // No frames yet in next window
        mFrames = 0;
        // which starts right now
        mSampleStart = timestamp;
        // and ends MEM_INFO_THROTTLE seconds in the future
        mSampleEnd = mSampleStart + MEM_INFO_THROTTLE;

        // On the very first call, that's all we can do, no framerate
        // computation is possible.
        if (sampleStart < 0)
        {
            return false;
        }

        // How long did this actually take? As framerate slows, the duration
        // of the frame we just finished could push us WELL beyond our desired
        // sample window size.
        F32 elapsed(timestamp - sampleStart);
        F32 framerate(frames/elapsed);

        // We're especially interested in memory as framerate drops. Only log
        // when framerate is lower than ever before. (Should always be true
        // for the end of the very first sample window.)
        if (framerate >= mSlowest)
        {
            return false;
        }
        // Congratulations, we've hit a new low.  :-P
        mSlowest = framerate;

        LL_INFOS("FrameWatcher") << mDesc << " framerate "
                                 << std::fixed << std::setprecision(1) << framerate << '\n'
                                 << LLMemoryInfo() << LL_ENDL;
        mDesc = "new lowest";

        return false;
    }

private:
    // Storing the connection in an LLTempBoundListener ensures it will be
    // disconnected when we're destroyed.
    LLTempBoundListener mConnection;
    // Track elapsed time
    LLTimer mTimer;
    // Some of what you see here is in fact redundant with functionality you
    // can get from LLTimer. Unfortunately the LLTimer API is missing the
    // feature we need: has at least the stated interval elapsed, and if so,
    // exactly how long has passed? So we have to do it by hand, sigh.
    // Time at start, end of sample window
    F32 mSampleStart, mSampleEnd;
    // Frames this sample window
    U32 mFrames;
    // Slowest framerate EVAR
    F32 mSlowest;
    // Description of next notable framerate
    std::string mDesc;
};

static FrameWatcher sFrameWatcher;

BOOL gunzip_file(const std::string& srcfile, const std::string& dstfile)
{
	std::string tmpfile;
	const S32 UNCOMPRESS_BUFFER_SIZE = 32768;
	BOOL retval = FALSE;
	gzFile src = NULL;
	U8 buffer[UNCOMPRESS_BUFFER_SIZE];
	LLFILE *dst = NULL;
	S32 bytes = 0;
	tmpfile = dstfile + ".t";
	src = gzopen(srcfile.c_str(), "rb");
	if (! src) goto err;
	dst = LLFile::fopen(tmpfile, "wb");		/* Flawfinder: ignore */
	if (! dst) goto err;
	do
	{
		bytes = gzread(src, buffer, UNCOMPRESS_BUFFER_SIZE);
		size_t nwrit = fwrite(buffer, sizeof(U8), bytes, dst);
		if (nwrit < (size_t) bytes)
		{
			llwarns << "Short write on " << tmpfile << ": Wrote " << nwrit << " of " << bytes << " bytes." << llendl;
			goto err;
		}
	} while(gzeof(src) == 0);
	fclose(dst); 
	dst = NULL;	
	if (LLFile::rename(tmpfile, dstfile) == -1) goto err;		/* Flawfinder: ignore */
	retval = TRUE;
err:
	if (src != NULL) gzclose(src);
	if (dst != NULL) fclose(dst);
	return retval;
}

BOOL gzip_file(const std::string& srcfile, const std::string& dstfile)
{
	const S32 COMPRESS_BUFFER_SIZE = 32768;
	std::string tmpfile;
	BOOL retval = FALSE;
	U8 buffer[COMPRESS_BUFFER_SIZE];
	gzFile dst = NULL;
	LLFILE *src = NULL;
	S32 bytes = 0;
	tmpfile = dstfile + ".t";
	dst = gzopen(tmpfile.c_str(), "wb");		/* Flawfinder: ignore */
	if (! dst) goto err;
	src = LLFile::fopen(srcfile, "rb");		/* Flawfinder: ignore */
	if (! src) goto err;

	do
	{
		bytes = (S32)fread(buffer, sizeof(U8), COMPRESS_BUFFER_SIZE,src);
		gzwrite(dst, buffer, bytes);
	} while(feof(src) == 0);
	gzclose(dst);
	dst = NULL;
#if LL_WINDOWS
	// Rename in windows needs the dstfile to not exist.
	LLFile::remove(dstfile);
#endif
	if (LLFile::rename(tmpfile, dstfile) == -1) goto err;		/* Flawfinder: ignore */
	retval = TRUE;
 err:
	if (src != NULL) fclose(src);
	if (dst != NULL) gzclose(dst);
	return retval;
}