Knowledge about Linux CPU and Linux CPU
What is the difference between hyper-threading and multithreading?
Hyper-threading is understood from the hardware layer, that is, a CPU component (which can be understood as a core) executes multiple commands at the same time, which means that multiple threads are executed at the same time.Multithreading is a concept at th
system yum install-y cpufreq-utils.i386 #64-bit system yum install-y cpufreq-utils.x86_64
III. view the current CPU operating frequency and status
cpufreq-info
Run the above command by using SSH and output the following results:
Cpufrequtils 005: cpufreq-info (C) Dominik Brodowski 2004-2006Report errors and bugs to cpufreq@vger.kernel.org, please.Analyzing CPU 0:Driver: acpi-cpufreqCPUs which need to
40 W ),X (more than 40 W ),T (30-39 W ),P (20-29 W ),L (12-19 W ),U (less than 12 W );Mini edition: SP (20-29 W), SL (12-19 W), SU (less than 12 W ).
Generally, low-power and ultra-low-power mobile processors are released one quarter later than standard power processors. Therefore, mobile processors of the L and U series have not yet been published. From another perspective, there is a need to encapsulate SL and SU with a smaller volume, and there is no need to encapsulate L and U processors wi
The program is written by PHP a websocket server, the client is connected to send messages continuously, the service side is responsible for responding to requests.
Tested: Once per request of client, server PHP consumes time of Microsecs to MICROSECS (message size is different).
The server is a single core, 30 clients, using top to view PHP processes occupy CPU around 3-5%, load average 1 minutes load display 0.05 or so. Basically meet expectations.
A computer overclock increases the operating frequency of CPU, video card, and other hardware manually so that they can work stably at a higher rate than its rated frequency. Taking intel p4c 2.4ghz CPU as an example, its rated operating frequency is 2.4 GHz. If the operating frequency is increased to 2.6 GHz, the syst
Http://www.bkjia.com/kf/201110/107760.html.
You can use C # To specify the CPU on which the current thread runs.
Pass
System. Diagnostics. Process p = Process. GetCurrentProcess ();P. ProcessorAffinity = (IntPtr) 0x0001;
Process. ProcessorAffinity: sets the shielding word for the current CPU. 0x0001 indicates that CPU 1 is selected, and 0x0002 indicates that
When using a system, we must look at the system configuration, while the CentOS system looks at the configuration, it is not as intuitive as windows. You can only view them one by one. Many people are overwhelmed by how to view the CPU of the CentOS system. Next, let's learn how to view the CPU in the CentOS system. I. CentOS cpu [root @ srv/] # more/proc/cpuinfo
When using a system, we must look at the system configuration, while the CentOS system looks at the configuration, it is not as intuitive as windows. You can only view them one by one. Many people are overwhelmed by how to view the CPU Of The CentOS system.
Next, let's learn how to view the CPU in the CentOS system.
I. CentOS system cpu
[Root @ srv/] # more/proc/
386, it is the CPU level.
I586-is a 586-level computer, including the first generation of pentum mmx cpu, AMD K5, and K6 system CPU (socket7 pin.
I686-pentum 2 after the Intel system CPU and K7 after the CPU level belongs to this 686 level.
You can query your
[1] Physical CPU: The number of CPUs on the slot in the actual server.
Number of physical CPUs: There are several physical IDs that can be counted without duplicates.
[2] Logical CPU
Linux users are certainly not unfamiliar with the/proc/cpuinfo file. It is used to store CPU hardware information.The information content lists the specifications of the processor
on.Code:Cpufreq-infoThis is the case with my CPU in PowerSave modeCode:zhuqin@ubuntu:~$ Cpufreq-infoCpufrequtils 002:cpufreq-info (C) Dominik Brodowski 2004-2006The errors and bugs to linux@brodo.de.Analyzing CPU 0:Driver:centrinoCPUs which need to switch frequency at the same time:0Hardware limits:798 MHz-1.73 GHzAvailable Frequency steps:1.73 GHz, 1.73
1. clock speed
The clock speed is also called the clock frequency. The unit is MHz, which indicates the computing speed of the CPU. CPU clock speed = frequency X frequency doubling coefficient. Many people think that the clock speed determines the CPU running speed. This is not only one-sided, but also a misunderstanding of the server. So far, there is no definit
the/proc/cpuinfo file.
Ii. View CPU Information
We can view CPU information through the/proc/cpuinfo file.
[Root @ qs-wgdb-1 proc] # more/proc/cpuinfo
Processor: 0
Vendor_id: GenuineIntel
Cpu family: 6
Model: 44
Model name: Intel (R) Xeon (R) CPU E5630 @ 2.53 GHz
course, can also use a variety of artifact-assisted positioning, such as Jprofiler .3 What is a CPUCPU: Interprets computer instructions and processes data in computer software.The performance of the computer is largely determined by the performance of the CPU, and the performance of the CPU is mainly reflected in the speed of its running program. performance metrics that affect operating speed include par
U2300
Note: from top to bottom, the CPU performance is increased from high to low, that is, the t7700 has the highest performance, and the u2300 has the lowest performance. The performance of the CPU type in the same row is not much different. (The functions are not considered)PS: I always thought that the higher the model, the better the p
-selector, and cpufreq-set.
For specific usage, see man or add-h after the command.
For example, code:
Man cpufreq-info
Or code:
Cpufreq-info-h
1. View the CPU type, current frequency, supported frequency, and running mode. Code:
Cpufreq-info
This is the code of my cpu in powersave mode:
Zhuqin @ ubuntu :~ $ Cpufreq-info
Cpufrequtils 002: cpufreq-info (C) Dominik brodoski 2004-2006
Report errors and bugs to
Test Object
1,unity script (C #)2,c# DLL (MCS build dynamic link library imported into unity)3,c Native Code (LLVM compiled after Unity) is tested function source code
(C #): Two random number array for size comparison, one array to save large number, and another to save decimals.
public void Minmax1_csharp (double[] a,double[] b,int n) {
int i;
for (i = 0; i
C:
extern void Minmax1 (double a[],double b[],int n) {
int i;
for (i = 0; i
test Script:
Using System.Co
1. Foreword
From the description of the Linux CPU Core power Management (1) _ Overview, kernel CPU control is located in ". \kernel\cpu.c", a connecting module that is responsible for shielding arch-dependent implementation details, Provides the top-level software with a unified API for controlling CPU core (mainly including the implementation of interfaces such
CPU Cache
Most CPUs only have Level 1 cache and level 2 cache, and some have Level 3 cache.The cache memory is the temporary memory between the CPU and memory. It has a smaller capacity than the memory but is faster than the memory. The data in the cache is a small part of the memory, but this small part is about to be accessed by the CPU in a short time. When th
■ Pisces
We have done a lot of articles about CPU, but for most users, we may not have the opportunity to split the CPU in the chassis. Therefore, this time, we will learn about our processor through the system and simple software methods.
EntryIf you only want to know your CPU model, Windows Me/2000/XP operating systems can help us complete this task. After ente
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