public override async Task <float> NextValueAsync()
{
if (this.uptimeInSeconds == -1)
{
throw new ObjectDisposedException(nameof(LinuxCpuUtilizationProvider));
}
(float ut, float it) = await LinuxProcFS.ReadUptimeAsync();
if (ut == this.uptimeInSeconds)
{
return(this.cpuUtilization);
}
this.cpuUtilization = 100 - ((it - this.idleTimeInSeconds) / (ut - this.uptimeInSeconds) / Environment.ProcessorCount * 100);
if (this.cpuUtilization < 0)
{
this.cpuUtilization = 0;
}
this.uptimeInSeconds = ut;
this.idleTimeInSeconds = it;
return(this.cpuUtilization);
}
public override async Task <OSInfo> GetOSInfoAsync(CancellationToken cancellationToken)
{
OSInfo osInfo = default(OSInfo);
(int exitCode, List <string> outputLines) = await ExecuteProcessAsync("lsb_release", "-d");
if (exitCode == 0 && outputLines.Count == 1)
{
/*
** Example:
** Description:\tUbuntu 18.04.2 LTS
*/
osInfo.Name = outputLines[0].Split(':', count: 2)[1].Trim();
}
osInfo.Version = await File.ReadAllTextAsync("/proc/version");
osInfo.Language = string.Empty;
osInfo.Status = "OK";
osInfo.NumberOfProcesses = Process.GetProcesses().Length;
// Source code: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/proc/meminfo.c
Dictionary <string, ulong> memInfo = LinuxProcFS.ReadMemInfo();
osInfo.TotalVisibleMemorySizeKB = memInfo[MemInfoConstants.MemTotal];
osInfo.FreePhysicalMemoryKB = memInfo[MemInfoConstants.MemFree];
osInfo.AvailableMemoryKB = memInfo[MemInfoConstants.MemAvailable];
// On Windows, TotalVirtualMemorySize = TotalVisibleMemorySize + SizeStoredInPagingFiles.
// SizeStoredInPagingFiles - Total number of kilobytes that can be stored in the operating system paging files—0 (zero)
// indicates that there are no paging files. Be aware that this number does not represent the actual physical size of the paging file on disk.
// https://docs.microsoft.com/en-us/windows/win32/cimwin32prov/win32-operatingsystem
osInfo.TotalVirtualMemorySizeKB = osInfo.TotalVisibleMemorySizeKB + memInfo[MemInfoConstants.SwapTotal];
osInfo.FreeVirtualMemoryKB = osInfo.FreePhysicalMemoryKB + memInfo[MemInfoConstants.SwapFree];
(float uptime, float idleTime) = await LinuxProcFS.ReadUptimeAsync();
osInfo.LastBootUpTime = DateTime.UtcNow.AddSeconds(-uptime).ToString("o");
try
{
osInfo.InstallDate = new DirectoryInfo("/var/log/installer").CreationTimeUtc.ToString("o");
}
catch (IOException)
{
osInfo.InstallDate = "N/A";
}
return(osInfo);
}