我有一个安装了 ubuntu mate 的 virtualbox 客户机。从某天起，这个主机就让我的笔记本电脑过热，特别是在使用 Firefox（无 Chromium）浏览或使用 Java 应用程序（即 eclipse）时。
top
确认 CPU 使用率较高。
我尝试了很多帖子建议，但没有合理的结果：
- 优化 VirtualBox 设置
- 改变 windowo 渲染： marco -> compiz -> marco compton
- 重新安装 Java 并彻底清理：openJDK -> java -> openJDK
- 更新/清除/自动清理
- 清理 Firefox 配置文件，以安全模式启动
- ...
现在我没得选择了。这是硬件配置
sudo lshw -sanitize
希望这能有所帮助，你会看到我在 8 个 CPU 中只分配了 2 个，但是 4 个或 6 个没有任何变化：
computer
description: Computer
product: VirtualBox
vendor: innotek GmbH
version: 1.2
serial: [REMOVED]
width: 64 bits
capabilities: smbios-2.5 dmi-2.5 vsyscall32
configuration: family=Virtual Machine uuid=[REMOVED]
*-core
description: Motherboard
product: VirtualBox
vendor: Oracle Corporation
physical id: 0
version: 1.2
serial: [REMOVED]
*-firmware
description: BIOS
vendor: innotek GmbH
physical id: 0
version: VirtualBox
date: 12/01/2006
size: 128KiB
capabilities: isa pci cdboot bootselect int9keyboard int10video acpi
*-memory
description: System memory
physical id: 1
size: 3945MiB
*-cpu
product: Intel(R) Core(TM) i5-6440HQ CPU @ 2.60GHz
vendor: Intel Corp.
physical id: 2
bus info: cpu@0
width: 64 bits
capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx rdtscp x86-64 constant_tsc rep_good nopl xtopology nonstop_tsc cpuid pni ssse3 pcid sse4_1 sse4_2 x2apic hypervisor lahf_lm invpcid_single pti retpoline rsb_ctxsw fsgsbase invpcid
*-pci
description: Host bridge
product: 440FX - 82441FX PMC [Natoma]
vendor: Intel Corporation
physical id: 100
bus info: pci@0000:00:00.0
version: 02
width: 32 bits
clock: 33MHz
*-isa
description: ISA bridge
product: 82371SB PIIX3 ISA [Natoma/Triton II]
vendor: Intel Corporation
physical id: 1
bus info: pci@0000:00:01.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: isa bus_master
configuration: latency=0
*-ide
description: IDE interface
product: 82371AB/EB/MB PIIX4 IDE
vendor: Intel Corporation
physical id: 1.1
bus info: pci@0000:00:01.1
version: 01
width: 32 bits
clock: 33MHz
capabilities: ide bus_master
configuration: driver=ata_piix latency=64
resources: irq:0 ioport:1f0(size=8) ioport:3f6 ioport:170(size=8) ioport:376 ioport:d000(size=16)
*-display
description: VGA compatible controller
product: VirtualBox Graphics Adapter
vendor: InnoTek Systemberatung GmbH
physical id: 2
bus info: pci@0000:00:02.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: vga_controller rom
configuration: driver=vboxvideo latency=0
resources: irq:18 memory:e0000000-e7ffffff memory:c0000-dffff
*-network
description: Ethernet interface
product: 82540EM Gigabit Ethernet Controller
vendor: Intel Corporation
physical id: 3
bus info: pci@0000:00:03.0
logical name: enp0s3
version: 02
serial: [REMOVED]
size: 1Gbit/s
capacity: 1Gbit/s
width: 32 bits
clock: 66MHz
capabilities: pm pcix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000 driverversion=7.3.21-k8-NAPI duplex=full ip=[REMOVED] latency=64 link=yes mingnt=255 multicast=yes port=twisted pair speed=1Gbit/s
resources: irq:19 memory:f0000000-f001ffff ioport:d010(size=8)
*-generic
description: System peripheral
product: VirtualBox Guest Service
vendor: InnoTek Systemberatung GmbH
physical id: 4
bus info: pci@0000:00:04.0
version: 00
width: 32 bits
clock: 33MHz
configuration: driver=vboxguest latency=0
resources: irq:20 ioport:d020(size=32) memory:f0400000-f07fffff memory:f0800000-f0803fff
*-multimedia
description: Multimedia audio controller
product: 82801AA AC'97 Audio Controller
vendor: Intel Corporation
physical id: 5
bus info: pci@0000:00:05.0
version: 01
width: 32 bits
clock: 33MHz
capabilities: bus_master
configuration: driver=snd_intel8x0 latency=64
resources: irq:21 ioport:d100(size=256) ioport:d200(size=64)
*-bridge
description: Bridge
product: 82371AB/EB/MB PIIX4 ACPI
vendor: Intel Corporation
physical id: 7
bus info: pci@0000:00:07.0
version: 08
width: 32 bits
clock: 33MHz
capabilities: bridge
configuration: driver=piix4_smbus latency=0
resources: irq:9
*-usb
description: USB controller
product: 7 Series/C210 Series Chipset Family USB xHCI Host Controller
vendor: Intel Corporation
physical id: c
bus info: pci@0000:00:0c.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: xhci bus_master cap_list
configuration: driver=xhci_hcd latency=64
resources: irq:20 memory:f0810000-f081ffff
*-usbhost:0
product: xHCI Host Controller
vendor: Linux 4.13.0-38-generic xhci-hcd
physical id: 0
bus info: usb@1
logical name: usb1
version: 4.13
capabilities: usb-2.00
configuration: driver=hub slots=8 speed=480Mbit/s
*-usb
description: Human interface device
product: USB Tablet
vendor: VirtualBox
physical id: 1
bus info: usb@1:1
version: 1.00
capabilities: usb-1.10
configuration: driver=usbhid maxpower=100mA speed=12Mbit/s
*-usbhost:1
product: xHCI Host Controller
vendor: Linux 4.13.0-38-generic xhci-hcd
physical id: 1
bus info: usb@2
logical name: usb2
version: 4.13
capabilities: usb-3.00
configuration: driver=hub slots=6 speed=5000Mbit/s
*-storage
description: SATA controller
product: 82801HM/HEM (ICH8M/ICH8M-E) SATA Controller [AHCI mode]
vendor: Intel Corporation
physical id: d
bus info: pci@0000:00:0d.0
version: 02
width: 32 bits
clock: 33MHz
capabilities: storage pm ahci_1.0 bus_master cap_list
configuration: driver=ahci latency=64
resources: irq:21 ioport:d240(size=8) ioport:d248(size=4) ioport:d250(size=8) ioport:d258(size=4) ioport:d260(size=16) memory:f0820000-f0821fff
*-scsi:0
physical id: 3
logical name: scsi1
capabilities: emulated
*-cdrom
description: DVD reader
physical id: 0.0.0
bus info: scsi@1:0.0.0
logical name: /dev/cdrom
logical name: /dev/dvd
logical name: /dev/sr0
capabilities: audio dvd
configuration: status=nodisc
*-scsi:1
physical id: 4
logical name: scsi2
capabilities: emulated
*-disk
description: ATA Disk
product: VBOX HARDDISK
physical id: 0.0.0
bus info: scsi@2:0.0.0
logical name: /dev/sda
version: 1.0
serial: [REMOVED]
size: 78GiB (83GB)
capabilities: partitioned partitioned:dos
configuration: ansiversion=5 logicalsectorsize=512 sectorsize=512 signature=aea58258
*-volume:0
description: EXT4 volume
vendor: Linux
physical id: 1
bus info: scsi@2:0.0.0,1
logical name: /dev/sda1
logical name: /
version: 1.0
serial: [REMOVED]
size: 74GiB
capacity: 74GiB
capabilities: primary bootable journaled extended_attributes large_files huge_files dir_nlink extents ext4 ext2 initialized
configuration: created=2017-10-28 13:36:26 filesystem=ext4 lastmountpoint=/ modified=2018-04-05 08:01:44 mount.fstype=ext4 mount.options=rw,relatime,errors=remount-ro,stripe=32606,data=ordered mounted=2018-04-04 17:23:34 state=mounted
*-volume:1
description: Extended partition
physical id: 2
bus info: scsi@2:0.0.0,2
logical name: /dev/sda2
size: 4095MiB
capacity: 4095MiB
capabilities: primary extended partitioned partitioned:extended
*-logicalvolume
description: Linux swap / Solaris partition
physical id: 5
logical name: /dev/sda5
capacity: 4094MiB
capabilities: nofs