powershell获取CPU占用率

实际上，我们可以通过PowerShell来获取性能计数器的值，比如当计算机可用内存小于500MB时，则自动发送邮件告警。

在PowerShell中，并没有专门的命令来获取性能计数器的值，也无法直接发送邮件，都需要先创建.Net Framework类的实例。

1）获取性能计数器代码如下：

#新建性能计数器对象 $counter = New-Object Diagnostics.PerformanceCounter #添加计数器，此处监视内存性能 $counter.CategoryName = "Memory" #添加计数器属性值，此处监视可用内存 $counter.CounterName = "Available MBytes" #获取当前计数器的值 $value = $counter.NextValue()

2）发送邮件代码如下：

#定义SMTP服务器地址，发件人账户及其密码 $smtpServer = "smtp.163.com" $smtpUser = "[email protected]" $smtpPassword = "mypasswd"   $mail = New-Object System.Net.Mail.MailMessage #定义发件人邮箱地址、收件人邮箱地址 $MailAddress="[email protected]" $MailtoAddress="[email protected]" $mail.From = New-Object System.Net.Mail.MailAddress($MailAddress) $mail.To.Add($MailtoAddress)   #定义邮件标题、优先级和正文 $mail.Subject = "警报"; $mail.Priority  = "High" $mail.Body = "PowerShell发送邮件测试！"

 

完整的代码如下：

#添加性能计数器 $counter = New-Object Diagnostics.PerformanceCounter $counter.CategoryName = "Memory" $counter.CounterName = "Available MBytes" $value = $counter.NextValue() #设置预设阀值 $prevalue = 500   #定义SMTP服务器地址，发件人账户及其密码 $smtpServer = "smtp.163.com" $smtpUser = "[email protected]" $smtpPassword = "mypasswd"   $mail = New-Object System.Net.Mail.MailMessage #定义发件人邮箱地址、收件人邮箱地址 $MailAddress="[email protected]" $MailtoAddress="[email protected]" $mail.From = New-Object System.Net.Mail.MailAddress($MailAddress) $mail.To.Add($MailtoAddress)   #定义邮件标题、优先级和正文 $mail.Subject = "警报"; $mail.Priority  = "High" $mail.Body = "XX值已达到$value，已超出预设阀值$prevalue!"   #判断是否超过预设阀值，如超出则发邮件报警 If ( $value -gt $prevalue) {  $smtp = New-Object System.Net.Mail.SmtpClient -argumentList $smtpServer  $smtp.Credentials = New-Object System.Net.NetworkCredential -argumentList $smtpUser,$smtpPassword  $smtp.Send($mail) }

 

 

===============================================

#查看当前CPU利用率

 $counter = New-Object Diagnostics.PerformanceCounter 
 3 $counter.CategoryName = "Processor"
 4 
 5 $counter.CounterName = "% Processor Time"
 6 
 7 $counter.InstanceName = "_Total"
 8 
 9 while ($true)
10 
11 {
12 
13 $value = $counter.NextValue()
14 
15 Write-Host "CPU: $value"
16 
17 sleep 1
18 
19 }

 

#查看进程的CPU利用率：

1 #取CPU核心数量，如果计算机为多核心的话，Process/% Processor Time的结果为每个核心的CPU利用率之和，会大于100%
2 $cpus = (gwmi win32_computersystem).NumberOfLogicalProcessors
3  
4 $counter = New-Object Diagnostics.PerformanceCounter
5 $counter.CategoryName = "Process"
6 $counter.CounterName = "% Processor Time"
7 $counter.InstanceName = "winrar" #定义需要监视的进程
8 #获取当前计数器的值
9 $counter.NextValue()/$cpus

 

NumberOfCores：表示CPU核心数
NumberOfLogicalProcessors：表示CPU线程数

 

#查看进程的内存使用情况：

1 $TotalMemory = (Get-WmiObject -Class Win32_PhysicalMemory |measure capacity -sum).Sum   #(gwmi win32_computersystem).TotalPhysicalMemory
2 
3 $counter = New-Object Diagnostics.PerformanceCounter
4 $counter.CategoryName = "Process"
5 $counter.CounterName = "Working Set - Private"
6 $counter.InstanceName = "ZQErpService" #定义需要监视的进程
7 #获取当前计数器的值
8 
9 $counter.NextValue()/$TotalMemory