Approved version. Approved on: 08:11, 20 February 2019
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Difference between revisions of "How to disable one CPU"
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1 How to see the number of active CPU[edit]
root@st:~# cat /proc/cpuinfo
processor : 0
model name : ARMv7 Processor rev 0 (v7l)
BogoMIPS : 2387.14
Features : swp half thumb fastmult vfp edsp neon vfpv3 tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x3
CPU part : 0xc09
CPU revision : 0
processor : 1
model name : ARMv7 Processor rev 0 (v7l)
BogoMIPS : 2393.70
Features : swp half thumb fastmult vfp edsp neon vfpv3 tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x3
CPU part : 0xc09
CPU revision : 0
Hardware : STi SoC with Flattened Device Tree
Revision : 0000
Serial : 0000000000000000
2 How to disable a CPU[edit]
On this example we disable CPU1
root@st:~# echo 0 > /sys/devices/system/cpu/cpu1/online
CPU1: shutdown
root@st:~# cat /proc/cpuinfo
processor : 0
model name : ARMv7 Processor rev 0 (v7l)
BogoMIPS : 2387.14
Features : swp half thumb fastmult vfp edsp neon vfpv3 tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x3
CPU part : 0xc09
CPU revision : 0
Hardware : STi SoC with Flattened Device Tree
Revision : 0000
Serial : 0000000000000000
3 How to enable a disabled CPU[edit]
On this example we enable CPU1
root@st:~# echo 1 > /sys/devices/system/cpu/cpu1/online
CPU1: shutdown
<noinclude> {{ArticleMainWriter|ChristopheP}} {{ArticleApprovedVersion | Jean-ChristopheT | Nobody | No previous approved version | Automatic approval (article under construction) | 19Feb’19}} [[category==How to see the number of active CPU==<pre> root@st:~# cat /proc/cpuinfo processor : 0 model name : ARMv7 Processor rev 0 (v7l) BogoMIPS : 2387.14 Features : swp half thumb fastmult vfp edsp neon vfpv3 tls CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x3 CPU part : 0xc09 CPU revision : 0 processor : 1 model name : ARMv7 Processor rev 0 (v7l) BogoMIPS : 2393.70 Features : swp half thumb fastmult vfp edsp neon vfpv3 tls CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x3 CPU part : 0xc09 CPU revision : 0 Hardware : STi SoC with Flattened Device Tree Revision : 0000 Serial : 0000000000000000</pre> ==How to disable a CPU== On this example we disable CPU1<pre> root@st:~# echo 0 > /sys/devices/system/cpu/cpu1/online CPU1: shutdown root@st:~# cat /proc/cpuinfo processor : 0 model name : ARMv7 Processor rev 0 (v7l) BogoMIPS : 2387.14 Features : swp half thumb fastmult vfp edsp neon vfpv3 tls CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x3 CPU part : 0xc09 CPU revision : 0 Hardware : STi SoC with Flattened Device Tree Revision : 0000 Serial : 0000000000000000</pre> ==How to enable a disabled CPU== On this example we enable CPU1<pre> root@st:~# echo 1 > /sys/devices/system/cpu/cpu1/online CPU1: shutdown</pre> <noinclude> {{PublicationRequestId | Auto}} [[Category:How to customize software]]</noinclude> {{UnderConstruction}}
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| + | ==How to see the number of active CPU== |
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| + | <pre> |
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| + | root@st:~# cat /proc/cpuinfo |
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| + | processor : 0 |
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| + | model name : ARMv7 Processor rev 0 (v7l) |
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| + | BogoMIPS : 2387.14 |
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| + | Features : swp half thumb fastmult vfp edsp neon vfpv3 tls |
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| + | CPU implementer : 0x41 |
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| + | CPU architecture: 7 |
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| + | CPU variant : 0x3 |
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| + | CPU part : 0xc09 |
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| + | CPU revision : 0 |
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| + | |||
| + | processor : 1 |
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| + | model name : ARMv7 Processor rev 0 (v7l) |
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| + | BogoMIPS : 2393.70 |
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| + | Features : swp half thumb fastmult vfp edsp neon vfpv3 tls |
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| + | CPU implementer : 0x41 |
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| + | CPU architecture: 7 |
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| + | CPU variant : 0x3 |
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| + | CPU part : 0xc09 |
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| + | CPU revision : 0 |
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| + | |||
| + | Hardware : STi SoC with Flattened Device Tree |
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| + | Revision : 0000 |
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| + | Serial : 0000000000000000 |
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| + | </pre> |
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| + | |||
| + | ==How to disable a CPU== |
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| + | On this example we disable CPU1 |
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| + | <pre> |
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| + | root@st:~# echo 0 > /sys/devices/system/cpu/cpu1/online |
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| + | CPU1: shutdown |
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| + | root@st:~# cat /proc/cpuinfo |
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| + | processor : 0 |
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| + | model name : ARMv7 Processor rev 0 (v7l) |
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| + | BogoMIPS : 2387.14 |
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| + | Features : swp half thumb fastmult vfp edsp neon vfpv3 tls |
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| + | CPU implementer : 0x41 |
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| + | CPU architecture: 7 |
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| + | CPU variant : 0x3 |
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| + | CPU part : 0xc09 |
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| + | CPU revision : 0 |
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| + | |||
| + | Hardware : STi SoC with Flattened Device Tree |
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| + | Revision : 0000 |
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| + | Serial : 0000000000000000 |
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| + | </pre> |
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| + | |||
| + | ==How to enable a disabled CPU== |
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| + | On this example we enable CPU1 |
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| + | <pre> |
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| + | root@st:~# echo 1 > /sys/devices/system/cpu/cpu1/online |
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| + | CPU1: shutdown |
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| + | </pre> |
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| + | |||
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+ | {{PublicationRequestId | Auto}} |
| − | + | [[Category:How to customize software]] |
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