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20170211-6 选题
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CoreFreq – A Powerful CPU Monitoring Tool for Linux Systems
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============================================================
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CoreFreq is a [CPU monitoring program][1] intended for the Intel 64-bits processor and supports architectures such as Atom, Core2, Nehalem, SandyBridge and above, AMD Family 0F.
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Its core is established on a kernel module which helps to retrieve internal performance counters from each CPU core, and works in relation with a daemon which gathers the data and a small console client links to the daemon and displays collected data.
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[
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][2]
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It offers a groundwork to recapture CPU data with a high degree of accuracy:
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1. Core frequencies & ratios; SpeedStep (EIST), Turbo Boost, Hyper-Threading (HTT) as well as Base Clock.
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2. Performance counters in conjunction with Time Stamp Counter (TSC), Unhalted Core Cycles (UCC), Unhalted Reference Cycles (URC).
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3. Number of instructions per cycle or second, IPS, IPC, or CPI.
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4. CPU C-States C0 C1 C3 C6 C7 – C1E – Auto/UnDemotion of C1 C3.
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5. DTS Temperature along with Tjunction Max, Thermal Monitoring TM1 TM2 state.
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6. Topology map including Caches for boostrap together with application CPU.
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7. Processor features, brand plus architecture strings.
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Note: This tool is more useful and appropriate for expert Linux users and experienced system administrators, however, novice users can gradually learn how to purposefully use it.
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#### How Does CoreFreq Works
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It functions by invoking a Linux Kernel module which then uses:
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1. asm code to keep the readings of the performance counters as close as possible.
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2. per-CPU, effects slab data memory plus high-resolution timer.
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3. compliant with suspend / resume and CPU Hot-Plug.
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4. a shared memory to protect kernel from the user-space part of the program.
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5. atomic synchronization of threads to do away with mutexes and deadlock.
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### How to Install CoreFreq in Linux
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To install CoreFreq, first you need to install the prerequisites (Development Tools) to compile and build the program from source.
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```
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$ sudo yum group install 'Development Tools' [On CentOS/RHEL]
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$ sudo dnf group install 'Development Tools' [On Fedora 22+ Versions]
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# sudo apt-get install dkms git libpthread-stubs0-dev [On Debian/Ubuntu]
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```
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Next clone the CoreFreq source code from the Github repository, move into the download folder and compile and build the program:
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```
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$ git clone https://github.com/cyring/CoreFreq.git
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$ cd CoreFreq
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$ make
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```
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[
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][3]
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Build CoreFreq Program
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Note: Arch Linux users can install [corefreq-git][4] from the AUR.
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Now run the following commands to load the Linux kernel module from local directory followed by the daemon:
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```
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$ sudo insmod corefreqk.ko
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$ sudo ./corefreqd
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```
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Then, start the client, as a user.
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```
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$ ./corefreq-cli
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```
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[
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][5]
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CoreFreq Linux CPU Monitoring
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From the interface above, you can use shortcut keys:
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1. `F2` to display a usage menu as seen at the top section of the screen.
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2. `Right` and `Left` arrows to move over the menu tabs.
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3. `Up` and `Down` arrows to select a menu item, then click [Enter].
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4. `F4` will close the program.
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5. `h` will open a quick reference.
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To view all usage options, type the command below:
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```
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$ ./corefreq-cli -h
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```
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CoreFreq Options
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```
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CoreFreq. Copyright (C) 2015-2017 CYRIL INGENIERIE
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usage: corefreq-cli [-option <arguments>]
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-t Show Top (default)
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-d Show Dashboard
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arguments: <left> <top> <marginWidth> <marginHeight>
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-c Monitor Counters
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-i Monitor Instructions
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-s Print System Information
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-M Print Memory Controller
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-m Print Topology
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-u Print CPUID
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-k Print Kernel
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-h Print out this message
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Exit status:
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0 if OK,
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1 if problems,
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>1 if serious trouble.
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Report bugs to labs[at]cyring.fr
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```
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To print info about the kernel, run:
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```
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$ ./corefreq-cli -k
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```
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Print CPU identification details:
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```
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$ ./corefreq-cli -u
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```
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You can as well monitor CPU instructions in real-time:
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```
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$ ./corefreq-cli -i
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```
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Enable tracing of counters as below:
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```
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$ ./corefreq-cli -c
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```
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For more information and usage, visit the CoreFreq Github repository: [https://github.com/cyring/CoreFreq][6]
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In this article, we reviewed a powerful CPU monitoring tool, which may be more useful to Linux experts or experienced system administrators as compared to novice users.
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Share your thoughts about this command tool or any related ideas with us via the feedback form below.
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--------------------------------------------------------------------------------
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作者简介：
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Aaron Kili is a Linux and F.O.S.S enthusiast, an upcoming Linux SysAdmin, web developer, and currently a content creator for TecMint who loves working with computers and strongly believes in sharing knowledge.
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--------------------------------------------------------------------------------
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via: http://www.tecmint.com/corefreq-linux-cpu-monitoring-tool/
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作者：[Aaron Kili][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://www.tecmint.com/author/aaronkili/
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[1]:http://www.tecmint.com/bcc-best-linux-performance-monitoring-tools/
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[2]:http://www.tecmint.com/wp-content/uploads/2017/02/CoreFreq-CPU-Monitoring.gif
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[3]:http://www.tecmint.com/wp-content/uploads/2017/02/make-corefreq.png
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[4]:https://aur.archlinux.org/packages/corefreq-git
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[5]:http://www.tecmint.com/wp-content/uploads/2017/02/CoreFreq-Linux-CPU-Monitoring.gif
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[6]:https://github.com/cyring/CoreFreq
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