blocks|key|219534|text|nproc是你要找的东西。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|219535|这里有更多信息：http://www.cyberciti.biz/faq/linux-get-number-of-cpus-core-command/|219536|entityMap|0|LINK|mutability|MUTABLE|url|http://www.cyberciti.biz/faq/linux-get-number-of-cpus-core-command/^0|0|5|0|8|1V|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@$9|T|A|U|1|V]]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

<code>nproc</code> is what you are looking for.

More here : <a href="http://www.cyberciti.biz/faq/linux-get-number-of-cpus-core-command/" rel="noreferrer">http://www.cyberciti.biz/faq/linux-get-number-of-cpus-core-command/</a>

blocks|key|127654|text|最简单的工具是glibc，称为getconf。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|127655|$+getconf+_NPROCESSORS_ONLN
4|code-block|syntax|javascript|127656|entityMap^0|F|7|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

The most simplest tool comes with glibc and is called <code>getconf</code>:

<pre><code>$ getconf _NPROCESSORS_ONLN
4
</code></pre>

blocks|key|219547|text|我认为您给出的方法是Linux上最可移植的方法。与其产生不必要的cat和wc进程，您可以将其缩短一点：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|219548|$+grep+--count+%5Eprocessor+/proc/cpuinfo
2|code-block|syntax|javascript|219549|entityMap^0|W|3|10|2|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

I think the method you give is the most portable on Linux. Instead of spawning unnecessary <code>cat</code> and <code>wc</code> processes, you can shorten it a bit:

<pre><code>$ grep --count ^processor /proc/cpuinfo
2
</code></pre>

blocks|key|219558|text|如果您想要这样做，以便在linux和OS上工作，您可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|219559|CORES=$(grep+-c+%5Eprocessor+/proc/cpuinfo+2>/dev/null+%7C%7C+sysctl+-n+hw.ncpu)|code-block|syntax|javascript|219560|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you want to do this so it works on linux and OS X, you can do:

<pre><code>CORES=$(grep -c ^processor /proc/cpuinfo 2&gt;/dev/null || sysctl -n hw.ncpu)
</code></pre>

blocks|key|253342|text|在较新的内核上，您还可以使用/sys/devices/system/cpu/接口获得更多信息：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|253343|$+ls+/sys/devices/system/cpu/
cpu0++cpufreq++kernel_max++offline++possible++present++release
cpu1++cpuidle++modalias++++online+++power+++++probe++++uevent
$+cat+/sys/devices/system/cpu/kernel_max+
255
$+cat+/sys/devices/system/cpu/offline+
2-63
$+cat+/sys/devices/system/cpu/possible+
0-63
$+cat+/sys/devices/system/cpu/present+
0-1
$+cat+/sys/devices/system/cpu/online+
0-1|code-block|syntax|javascript|253344|有关所有这些内容的更多信息，请参见the+official+docs。|253345|entityMap|0|LINK|mutability|MUTABLE|url|https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-devices-system-cpu^0|E|O|0|0|H|H|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

On newer kernels you could also possibly use the the <code>/sys/devices/system/cpu/</code> interface to get a bit more information:

<pre><code>$ ls /sys/devices/system/cpu/
cpu0 cpufreq kernel_max offline possible present release
cpu1 cpuidle modalias online power probe uevent
$ cat /sys/devices/system/cpu/kernel_max 
255
$ cat /sys/devices/system/cpu/offline 
2-63
$ cat /sys/devices/system/cpu/possible 
0-63
$ cat /sys/devices/system/cpu/present 
0-1
$ cat /sys/devices/system/cpu/online 
0-1
</code></pre>

See <a href="https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-devices-system-cpu">the official docs</a> for more information on what all these mean.

blocks|key|253479|text|当有人要求“处理器/核心的数量”时，有两个答案被请求。“处理器”的数量将是安装在机器上的套接字上的物理编号。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|253480|“核”的数量将是物理核。超线程(虚拟)核心不会被包括在内(至少在我看来)。作为一个用线程池编写大量程序的人，你真的需要知道物理内核和内核/超级线程的数量。也就是说，您可以修改下面的脚本以获得所需的答案。|253481|#!/bin/bash

MODEL=`cat+/cpu/procinfo+%7C+grep+"model+name"+%7C+sort+%7C+uniq`
ALL=`cat+/proc/cpuinfo+%7C+grep+"bogo"+%7C+wc+-l`
PHYSICAL=`cat+/proc/cpuinfo+%7C+grep+"physical+id"+%7C+sort+%7C+uniq+%7C+wc+-l`
CORES=`cat+/proc/cpuinfo+%7C+grep+"cpu+cores"+%7C+sort+%7C+uniq+%7C+cut+-d':'+-f2`
PHY_CORES=$(($PHYSICAL+*+$CORES))
echo+"Type+$MODEL"
echo+"Processors+$PHYSICAL"
echo+"Physical+cores+$PHY_CORES"
echo+"Including+hyperthreading+cores+$ALL"|code-block|syntax|javascript|253482|在一台具有两个模型Xeon+X5650物理处理器的机器上的结果，每个处理器都有6个支持超线程的物理核：|253483|Type+model+name+:+Intel(R)+Xeon(R)+CPU+++++++++++X5650++@+2.67GHz
Processors+2
Physical+cores+12
Including+hyperthreading+cores+24|253484|在一台有2个mdeol+Xeon+E5472处理器的机器上，每个处理器都有4个不支持超线程的物理核|253485|Type+model+name+:+Intel(R)+Xeon(R)+CPU+++++++++++E5472++@+3.00GHz
Processors+2
Physical+cores+8
Including+hyperthreading+cores+8|253486|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

When someone asks for "the number of processors/cores" there are 2 answers being requested. The number of "processors" would be the physical number installed in sockets on the machine.

The number of "cores" would be physical cores. Hyperthreaded (virtual) cores would not be included (at least to my mind). As someone who writes a lot of programs with thread pools, you really need to know the count of physical cores vs cores/hyperthreads. That said, you can modify the following script to get the answers that you need. 

<pre><code>#!/bin/bash

MODEL=`cat /cpu/procinfo | grep "model name" | sort | uniq`
ALL=`cat /proc/cpuinfo | grep "bogo" | wc -l`
PHYSICAL=`cat /proc/cpuinfo | grep "physical id" | sort | uniq | wc -l`
CORES=`cat /proc/cpuinfo | grep "cpu cores" | sort | uniq | cut -d':' -f2`
PHY_CORES=$(($PHYSICAL * $CORES))
echo "Type $MODEL"
echo "Processors $PHYSICAL"
echo "Physical cores $PHY_CORES"
echo "Including hyperthreading cores $ALL"
</code></pre>

The result on a machine with 2 model Xeon X5650 physical processors each with 6 physical cores that also support hyperthreading:

<pre><code>Type model name : Intel(R) Xeon(R) CPU X5650 @ 2.67GHz
Processors 2
Physical cores 12
Including hyperthreading cores 24
</code></pre>

On a machine with 2 mdeol Xeon E5472 processors each with 4 physical cores that doesn't support hyperthreading

<pre><code>Type model name : Intel(R) Xeon(R) CPU E5472 @ 3.00GHz
Processors 2
Physical cores 8
Including hyperthreading cores 8
</code></pre>

blocks|key|127663|text|util项目提供的lscpu(1)命令也可能有用：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|127664|$+lscpu
Architecture:++++++++++x86_64
CPU+op-mode(s):++++++++32-bit,+64-bit
Byte+Order:++++++++++++Little+Endian
CPU(s):++++++++++++++++4
On-line+CPU(s)+list:+++0-3
Thread(s)+per+core:++++2
Core(s)+per+socket:++++2
Socket(s):+++++++++++++1
NUMA+node(s):++++++++++1
Vendor+ID:+++++++++++++GenuineIntel
CPU+family:++++++++++++6
Model:+++++++++++++++++58
Model+name:++++++++++++Intel(R)+Core(TM)+i7-3520M+CPU+@+2.90GHz
Stepping:++++++++++++++9
CPU+MHz:+++++++++++++++3406.253
CPU+max+MHz:+++++++++++3600.0000
CPU+min+MHz:+++++++++++1200.0000
BogoMIPS:++++++++++++++5787.10
Virtualization:++++++++VT-x
L1d+cache:+++++++++++++32K
L1i+cache:+++++++++++++32K
L2+cache:++++++++++++++256K
L3+cache:++++++++++++++4096K
NUMA+node0+CPU(s):+++++0-3|code-block|syntax|javascript|127665|entityMap^0|9|8|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

The <code>lscpu(1)</code> command provided by the util-linux project might also be useful:

<pre><code>$ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 2
Core(s) per socket: 2
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 58
Model name: Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz
Stepping: 9
CPU MHz: 3406.253
CPU max MHz: 3600.0000
CPU min MHz: 1200.0000
BogoMIPS: 5787.10
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 4096K
NUMA node0 CPU(s): 0-3
</code></pre>

blocks|key|253423|text|对于那些想要在*bsd、*nix或solaris上使用可移植的方法来计算cpu内核的人来说(还没有在aix和hp上进行测试，但应该可以工作)。它一直对我有用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|253424|dmesg+%7C+\
egrep+'cpu[.+]?[0-9]%2B'+%7C+\
sed+'s/%5E.*$cpu[.+]*[0-9]*$.*$/\1/g'+%7C+\
sort+-u+%7C+\
wc+-l+%7C+\
tr+-d+'+'|code-block|syntax|javascript|253425|solaris+grep+&+egrep没有-o选项，因此使用sed。|offset|length|style|CODE|253426|entityMap^0|0|0|8|4|F|5|M|2|V|3|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]|$I|V|J|W|K|L]|$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|N|$]]

This is for those who want to a portable way to count cpu cores on *bsd, *nix or solaris (haven't tested on aix and hp-ux but should work). It has always worked for me.

<pre><code>dmesg | \
egrep 'cpu[. ]?[0-9]+' | \
sed 's/^.*$cpu[. ]*[0-9]*$.*$/\1/g' | \
sort -u | \
wc -l | \
tr -d ' '
</code></pre>

solaris <code>grep</code> &amp; <code>egrep</code> don't have <code>-o</code> option so <code>sed</code> is used instead.

blocks|key|253439|text|另一条线，不含计数超线程核心|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|253440|lscpu+%7C+awk+-F+":"+'/Core/+{+c=$2;+};+/Socket/+{+print+c*$2+}'+|code-block|syntax|javascript|253441|entityMap^0|5|2|9|5|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

Another one-liner, without counting hyper-threaded cores:

<pre><code>lscpu | awk -F ":" '/Core/ { c=$2; }; /Socket/ { print c*$2 }' 
</code></pre>

blocks|key|127676|text|如果您需要一个os独立的方法，可以跨Windows和Linux工作。使用python|type|unstyled|depth|inlineStyleRanges|entityRanges|data|127677|$+python+-c+'import+multiprocessing+as+m;+print+m.cpu_count()'
16|code-block|syntax|javascript|127678|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you need an os independent method, works across Windows and Linux. Use python

<pre><code>$ python -c 'import multiprocessing as m; print m.cpu_count()'
16
</code></pre>

blocks|key|219686|text|另一种可移植的方法是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|219687|node+-p+'os.cpus().length'|code-block|syntax|javascript|219688|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Another portable way of doing this would be
<pre><code>node -p 'os.cpus().length'
</code></pre>

I am running the following command to get the number of processors/cores in Linux:

<pre><code>cat /proc/cpuinfo | grep processor | wc -l
</code></pre>

It works but it does not look elegant. How would you suggest improve it ?

Number of processors/cores in command line

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在运行以下命令以获取Linux中的处理器/核数：cat /proc/cpuinfo | grep processor | wc -l它工作，但看起来不雅致。你建议如何改进它？

问命令行中的处理器/核数
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