proc freq

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View CPU information under Linux [/proc/cpuinfo]

Tags: sibling knowledge start Linux operation analysis System load src alt numberRecently, when researching the load of Linux system, I have been exposed to some knowledge about CPU information, and share it with you. A lot of things have been learned by analyzing the parameters in the/proc/cpuinfo file.In the Linux operating system, the CPU information is loaded into the Cpuinfo file under the virtual directory/p

The number of Linux CPUs is judged by/proc/cpuinfo.

The number of Linux CPUs is judged by/proc/cpuinfo.Same Physical ID: determines a physical processorIf "siblings" and "CPU cores" are consistent, hyper-threading is not supported, or hyper-threading is not open.If "siblings" is twice Times "CPU cores", then hyper-Threading is supported and Hyper-threading is turned on.In fact, just#include Long num = sysconf (_SC_NPROCESSORS_ONLN);You can get the current number of CPUs ...Basis of judgment:1. CPUs wit

Proc File system for Linux

proc , the user space and the kernel space can communicate through this interface,Unlike normal files. the contents of these virtual files are created dynamically. proc file system is a pseudo file system, it only exists in memory, Without occupying external memory space. it provides an interface for access to system kernel data in the form of a file system. Users and Applicationsto pass

Class Linux system/proc/sysrq-trigger file function function

Restart your computer now echo "B" >/proc/sysrq-triggerTurn off the computer now echo "O" >/proc/sysrq-triggerExport memory allocation information echo "M" > Proc/sysrq-trigger (can be viewed with/var/log/message) Outputs memory statistics to the consoleExport current CPU register information and flag bits echo "P" > Proc

Have the Result Set of a Stored Proc Sent to the RSS feed.

Have the Result Set of a Stored Proc Sent to the RSS feed.by Jbrooks 14. December 12:44I wanted to monitor one of the my system from my desk top and from my phone. I found a simple solution whereby I can subscribe to the result set of a stored proc by using RSS. So I can having this feed MS Outlook, my phone or my web browser.First, Visual Studio makes creating an RSS feeds a simple matter that's about 1 pa

Device-driven basic learning--/proc adding nodes

#include #include #include #include #include #include #include #include #include #include #include static struct Proc_dir_entry *proc_root;static struct Proc_dir_entry *proc_entry;#define USER_ROOT_DIR "Fellow_root"#define User_entry "Fellow_entry"#define Info_len 16Char *info;static int proc_fellow_show (struct seq_file *m, void *v){seq_printf (M, "%s\n", info);return 0;}static int Proc_fellow_open (struct inode *inode, struct file *file){return Single_open (file, proc_fellow_show, NULL);}Stati

The similarities and differences between Ruby Proc and Lambda

What Proc and Lambda have in common: Similar syntaxproc.new{|n| N**2}lambda{|n| N**2} Can be called with the. Call methodHello_proc = proc.new{puts "hello!"}Hello_proc.call #Hello!Hello_lambda = lambda{puts "hello!"}Hello_lambda.call #Hello! can be converted to block with keywordNums = [1,3,4,5,6]Cube_proc = proc.new{|n| n**3}Cube_nums_proc = Nums.map (cube_proc) #[1,27,64 ...]Cube_lambda = lambda{|n| n**3}Cube_nums_lambda = Nums.map

Network Traffic Statistics script based on/proc

#! /Bin/sh # The following two parameters can be modified as needed: ethxname = eth0 # Nic name statfreq = 2 # statistical interval, in seconds. It is recommended to be a multiple of 2 or 2 # The following parameters, do not modify influx_kbps = 0outflux_kbps = 0influx_mbps = 0outflux_mbps = 0unsigned_long_max = 4294967295 # handle overflow ethname = 'cat /Proc/NET/dev| Grep $ ethxname | awk-F "[:] +" '{printf ("% s", $2);} ''if test" $ ethxname "! =

Fedora running Level and Its Virtual File System/proc

When adding new hardware to an existing Linux system, you want to know the resource configuration status of the current system. How should you view it? Very convenient. The/proc file system contains kernel information about resource allocation. Among them,/proc/interrupt,/proc/dma,/proc/ioports, including system interr

Use the proc file system to allow communication between Linux kernel space and user space

1. symptom and Problem Description 1. You need to directly interact with the kernel through scripts in linux user mode, such as getting/setting values of certain variables in the kernel. 2. dynamic configuration is required when the Linux kernel is started. 2. Key process and root cause analysis The/proc file system is a virtual file system through which a new method can be used to communicate between Linux kernel space and user space. In the/

Linux/proc/meminfo file Analysis (reprint)

Cat/proc/meminfo read out the kernel information to explain,The next article will simply analyze the code that reads the information.#Cat/proc/meminfomemtotal:16438852Kbmemfree:10980184kbbuffers:95884kbcached:224108kbswapcached:0kbactive:5161616kbinactive:217660kbhightotal:0Kbhighfree:0kblowtotal:16438852Kblowfree:10980184kbswaptotal:1048536Kbswapfree:1048536Kbdirty:424Kbwriteback:0kbanonpages:5059312kbmapp

Linux Device drivers-debugging proc

In the fourth chapter of the book "Linux device Drivers", we specialize in the debugging technology in driver development.PRINTK is just one of the techniques that requires PRINTK to print messages and write to files on disk, which slows down the entire code execution speed.There are also debugging techniques, and the effect on Code execution speed is smaller than prink.In this, we can have the driver create the file in the proc file system and write

proc++ A batch Import export Oracle database table

oracle| Data | database Recently, in developing a project, in order to solve the database IO bottleneck, the data in the database has to be exported as a text file. Text is uploaded to the client and then imported to the database. I embed proc++ with C++builder to write a DLL for import and export. If it's of any use to you, I am honored! Detailed contents are as follows: First, preparatory work Computer environment: Win-pro,oracle 9i,c++ Builder

--PROC Programming for Oracle database programming

Label:I. The concept of transactions in OracleIn Oracle, all modifications to the table are in one transaction (the transaction is like a buffer of memory)Statement that commits the transactioncommit;Discard TransactionsRollback;Principles:All modifications to the table by Oracle are in the transaction and are not directly modified to the table. Only commit or rollback is executed or discarded.For the SQL language, all syntax formats are standard, and most of the keywords are generic, but each d

About hot swapping USB hotplug/proc/sys/kernel mdev udev busybox

,Echo/sbin/mdev>/proc/sys/kernel/hotplugThen, the kernel calls the user space application/sbin/mdev passed in the above sentence to process the corresponding information when the device changes, the mdev application then adds or deletes devices in the/dev directory. You can refer to add the hotplug function to the kernel to monitor uevent information.Another useful part of mdev is that it can dynamically organize registered devices through the

On the proc and method in Nim

In Nim ,proc is the keyword that defines the process, and method is the keyword that defines it. The fundamental difference between them is that the process defined by proc is a static binding, and method is defined by dynamic binding. When it comes to static bindings, dynamic bindings, and things like overloading, rewriting, and polymorphism, if you don't understand some of these concepts, look at my last

Significance of Linux/proc

/proc is a virtual file system, that is, the modification will be reinitialized after the reboot provides process information, memory resources, hardware devices, kernel memory, and other information for example: NIC:/proc/sys/Vm/IPv4/ip_forward: control IP Forwarding memory:/proc/sys/Vm/drop_caches: input 1 force the kernel to release some memory from the ca

Features of/proc/sysrq-trigger files under Linux

/proc/sysrq-trigger what can be done with this file?# Restart your computer now (reboots the kernel without first unmounting file systems or syncing disks attached to the system)echo "B" >/proc/sysrq-trigger# Turn off the computer immediately (shuts off the system)echo "O" >/proc/sysrq-trigger# Export memory allocation information (can be viewed with/var/log/mess

Tcl Script Learning 11: Proc Application (with default parameters)

Lesson 11:proc application (with default parameters)1.//all parameter values are not necessarily entered when using the process. The input parameters of the procedure can have default values. The default value is determined by{Default parameter name default} specified. If the procedure is called without specifying the values of these parameters, its default value is used.Otherwise, use the input values to override the default values. When using defaul

[SAS base] Proc Export

Proc export can export two types of files: Export the delimited file1 * example; 2 proc export data = hotels 3 OUTFILE = 'C: \ myrawdata \ Alibaba s.txt '/* The suffix name determines the format of the output file. In addition, the value can also be specified using the DBMS = option. */4/* For example, if the space-delimited file does not have a standard suffix, you can only use the DBMS = option to outpu

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