cpu unit

when you go to computer city to buy a personal computer when the shopping guide will ask you about the general use of computers, in fact, they are to help you calculate the computer performance you need, including the calculation of the maximum load on the CPU, of course, they will not be so to calculate, but according to the price, because the high-priced CPU often better performance, Then, they will ask

frequency ≥2.4ghz. When it comes to processor frequency, mention the two closely related concepts: Frequency multiplier and FSB, FSB is the benchmark frequency of the CPU, and the unit is MHz. FSB is the speed at which the CPU runs synchronously with the motherboard, and most of the current computer system FSB is also memory and the speed of synchronization bet

1. Write unit tests for Unit Tests Recently, I have done" Program Team members write unit tests in project development.The survey results show:1. Almost no strict implementation of TDD (, TDD) in the project ).2. Write unit tests for most business methods and ensure that the methods pass the tests, accounting for 16.6

. This value should is user_hz the second entry in The/proc/uptime Pseudo-file.The approximate meaning is that these values are in user_hz units. Regardless of unit, their unit is consistent, then we can calculate the increment on each item by 2 times the output of the Vmstat-s command, and then the increment on 4 items is the total increment (in fact, there is more data about the

+resThe size, in kilobytes, of the physical memory used by the res-process and not swapped out. Res=code+datashr-shared memory size, in kilobytesS-process state. d= non-disruptive sleep status r= run s= sleep t= track/stop z= zombie Process%cpu-percentage of CPU time that was last updated to currentPercentage of physical memory used by the%mem-processTotal CPU ti

the difference in behavior and hotspot distribution of program instructions and program data.The following diagram shows the response time gap between cache levels and how slow the memory is!What is cache lineCache line can be simply understood as the minimum cache unit in the CPU cache. The current cache line size for the main CPU cache is 64Bytes. Assuming tha

: Shutting down the oprofile process View Test Results opreport : Displays the detection result in the image angle, the process, the dynamic library, the kernel module belongs to the mirror category opreport-l : Displays the detection result in the function angle opreport-l test : Displays the detection results for the test process as a function opannotate-s test : Displays the detection results for the test process at the code point opannotate-s/lib64/libc-2.4.so : To Code perspective, display

decrease in the search speed.In addition, simply increasing the number of groups associated without increasing the size of the cache will not alter the corresponding proportions of the cache and memory. In the example on the right, for the 2-way group, although there are two cache blocks in group No. 0, the group is now the target block of memory blocks 1, 9, 17, 25.A direct match can be thought of as a single-path group link. Empirical rules show that when the cache is less than 128KB, to achi

Gotest is a test tool provided by the go language. It includes two types: unit test and performance test. Go test is a test tool provided by go. It includes two types: unit test and performance test. Go help test shows how to use go test:Format: Go test [-c] [-I] [build flags] [packages] [flags for test binary]Parameter explanation: -C: compile go test as an executable binary file, but do not run the test.

anohter running is known asDispatch latency. 3 scheduling criteria 1. CPU utilization :We want to keep the CPU as busy as possible. CPU utilization may range from 0 to 100 percent. In a real system, It shocould range from 40 percent to 90 percen. 2. throughput: If the CPU is busy executing processes, then work is be

. The relationship between the physical address and the BUS address is determined by the system design. On the X86 platform, physical addresses are bus addresses because they share the same address space. Independent addressing ". Conversion/ ing may be required on other platforms. For example, if the CPU needs to access a unit whose physical address is 0xfa000, a PCI bus is generated on the X86 pla

codes are completed, to verify that they meet the needs of the program. You can verify that the function code meets your expectations by writing the test code to simulate the procedure that the program runs.Unit testing is where the developer writes a small piece of code to verify that the target code is functioning as expected. Typically, unit testing is primarily intended for some single-function modules.For example: A mobile phone has many compone

Hyper-Threading technology is a CPU at the same time to execute multiple programs to share a CPU resources, in theory, like two CPUs at the same time executing two threads, P4 processors need to add a logical CPU pointer (logical processing unit). So the die of the new generation of P4 HT is 5% larger than the previous

-CPU dual-core cache structure. cached lines Cache line The minimum unit of cache and memory Exchange data for cache rows, typically 64 bytes. That is, each time the data exchange between the cache and memory, is a byte-aligned contiguous 64 bytes of memory block throughout. cached access NBSP; No cache structure, CPU execution process, the use of virtual ad

: Parameter Name Description N With this switch parameter, if it is enabled, only the header information is displayed once. Delay Interval between two screen information refreshes. Unit: s Count When used with the delay parameter, if a specified value is specified, the system exits after running the specified number of times. Otherwise, the system runs infinitely. Enter "vmstat-n 1" in the console.

distribution of program instructions and program data. The following diagram shows the response time gap between cache levels and how slow the memory is!What is cache lineCache line can be simply understood as the minimum cache unit in the CPU cache. The current cache line size for the main CPU cache is 64Bytes. Assuming that we have a 512-byte cache, then the c

a Introduction to Unit testingUnit testing is the most important tool for code correctness verification, and is the most important part of system testing. is also the only test method that requires code to be written for testing. In the standard development process, the Code of the Unit test is of equal importance to the code of the actual program. Each unit tes

CPU) refers to a single processor CPU. It contains multiple processing units. Each processing unit is equivalent to a single-core processor CPU ). Therefore, the multi-core processor function is equivalent to the online operation of Multiple Single-core processor computers. Multi-thread processor multi-thread

paging is not used, it is a physical address. Otherwise, it is just a linear address, and then you can find the address of the page through the page Directory, page table, which is the final physical address. In fact, many details are not involved. For example, the Descriptor Table mentioned here is a Global Descriptor Table, and there is actually a Local Descriptor Table. For example, the descriptor only focuses on the address bit, the priority bit and other attribute bit are not described. Ho

package management, generally set to empty For the flags for test binary, call go Help Testflag, which are the parameters that are frequently used during go test -TEST.V: Whether to output all of the unit test cases (whether successful or unsuccessful), the default is not added, so only the failed unit test cases are output. -test.run pattern: Which unit test ca