之前我安裝了VirtualBox 來跑 Linux 虛擬機, 開始設置的時候設了 4G 內存, 結果后來不能改了. 造成的結果就是一開機, 內存飆到40%, 一開VirtualBox, 直接飆到95%. 然后開個數據庫開個EBS 服務, 基本就不用干其他事情了.

怎么修改VirtualBox 虛擬機的內存分配呢? 有一個實用程序可以直接修改:

cd C:\Program Files\VirtualBox
VBoxManage.exe modifyvm "EBS R12 RUP8" --memory "2048"

那么這個程序修改了什么呢? 我們可以去看看下面兩個配置文件;

1. 在User 目錄下, 有個不可見目錄 .VirtualBox, 里面有兩個文件比較重要: VirtualBox.xml 和 VirtualBox.xml-prev. 后面一個是備份文件, 可以不用管他, 前面一個我們可以看看里面的內容:

<?xml version="1.0"?>
<!--
** DO NOT EDIT THIS FILE.
** If you make changes to this file while any VirtualBox related application
** is running, your changes will be overwritten later, without taking effect.
** Use VBoxManage or the VirtualBox Manager GUI to make changes.
-->
<VirtualBox xmlns="http://www.innotek.de/VirtualBox-settings" version="1.12-windows">
  <Global>
    <ExtraData>
      <ExtraDataItem name="GUI/DetailsPageBoxes" value="generalClosed,previewClosed,system,displayClosed,storageClosed,audioClosed,networkClosed,usbClosed,sharedFoldersClosed,descriptionClosed,serialPortsClosed"/>
      <ExtraDataItem name="GUI/GroupDefinitions/" value="m=28233f89-d496-4c66-9d63-2f42f23f253a,m=34d9ffe0-5c7d-4eab-a87e-b2321e1babcb"/>
      <ExtraDataItem name="GUI/HostScreenSaverDisabled" value="false"/>
      <ExtraDataItem name="GUI/Input/AutoCapture" value="false"/>
      <ExtraDataItem name="GUI/Input/HostKeyCombination" value="163"/>
      <ExtraDataItem name="GUI/LastItemSelected" value="m=EBS R12 RUP8"/>
      <ExtraDataItem name="GUI/LastWindowPosition" value="654,228,770,550"/>
      <ExtraDataItem name="GUI/RecentFolderHD" value="E:/"/>
      <ExtraDataItem name="GUI/RecentListHD" value="E:\EBS R12 RUP8.vbox;E:\EBS R12 RUP8-disk1.vdi;E:\EBS_Linux_64.vdi;E:\Linux\Linux.vdi;"/>
      <ExtraDataItem name="GUI/SplitterSizes" value="231,533"/>
      <ExtraDataItem name="GUI/SuppressMessages" value=",remindAboutMouseIntegrationOff,remindAboutMouseIntegrationOn,remindAboutAutoCapture,showRuntimeError.warning.HostAudioNotResponding,showRuntimeError.warning.BrokenSharedFolder,confirmInputCapture,remindAboutMouseIntegration,warnAboutInaccessibleMedia"/>
      <ExtraDataItem name="GUI/TrayIcon/Enabled" value="false"/>
      <ExtraDataItem name="GUI/UpdateCheckCount" value="18"/>
      <ExtraDataItem name="GUI/UpdateDate" value="never"/>
      <ExtraDataItem name="HostOnly/VirtualBox Host-Only Ethernet Adapter/IPAddress" value="192.168.77.1"/>
      <ExtraDataItem name="HostOnly/VirtualBox Host-Only Ethernet Adapter/IPNetMask" value="255.255.255.0"/>
    </ExtraData>
    <MachineRegistry>
      <MachineEntry uuid="{28233f89-d496-4c66-9d63-2f42f23f253a}" src="G:/VMs/EBS R12 RUP8/EBS R12 RUP8.vbox"/>
      <MachineEntry uuid="{34d9ffe0-5c7d-4eab-a87e-b2321e1babcb}" src="C:\Users\yuzzhang\VirtualBox VMs\ubuntu_server\ubuntu_server.vbox"/>
    </MachineRegistry>
    <MediaRegistry>
      <HardDisks/>
      <DVDImages/>
      <FloppyImages/>
    </MediaRegistry>
    <NetserviceRegistry>
      <DHCPServers>
        <DHCPServer networkName="HostInterfaceNetworking-VirtualBox Host-Only Ethernet Adapter" IPAddress="192.168.56.100" networkMask="255.255.255.0" lowerIP="192.168.56.101" upperIP="192.168.56.254" enabled="0"/>
      </DHCPServers>
    </NetserviceRegistry>
    <SystemProperties defaultMachineFolder="C:\Users\yuzzhang\VirtualBox VMs" defaultHardDiskFormat="VDI" VRDEAuthLibrary="VBoxAuth" webServiceAuthLibrary="VBoxAuth" LogHistoryCount="3" exclusiveHwVirt="false"/>
    <USBDeviceFilters/>
  </Global>
</VirtualBox>

G:/VMs/EBS R12 RUP8/EBS R12 RUP8.vbox

在這個配置文件里面

    <Hardware version="2">
      <CPU count="2" executionCap="90" hotplug="false">
        <HardwareVirtEx enabled="true"/>
        <HardwareVirtExNestedPaging enabled="true"/>
        <HardwareVirtExVPID enabled="true"/>
        <HardwareVirtExUX enabled="true"/>
        <PAE enabled="true"/>
        <HardwareVirtExLargePages enabled="true"/>
        <HardwareVirtForce enabled="false"/>
      </CPU>
      <Memory RAMSize="2048" PageFusion="false"/>
      <HID Pointing="PS2Mouse" Keyboard="PS2Keyboard"/>
      <HPET enabled="false"/>
      <Chipset type="PIIX3"/>
      <Boot>
        <Order position="1" device="Floppy"/>
        <Order position="2" device="DVD"/>
        <Order position="3" device="HardDisk"/>
        <Order position="4" device="None"/>
...

也可以直接修改這個文件, 但是文件注釋告訴我們不要手動修改. 所以還是老老實實用程序或者通過界面修改吧;