, of which there are 3 in the running, 127 in hibernation (sleep), 0 in the stoped state, and 1 in the Zombie State (zombie). Third line: CPU status 10.6% US user space as a percentage of CPU usage. 2.2% Sy Core Space consumes a percentage of the CPU. 0.0% NI changed the priority of the process to occupy the percentage of CPU 84.5% ID idle CPU percentage 2.5% wa io wait cpu percentage 0.1% hi hard Interrupt (Hardware IRQ)% of CPU 0.0% si soft interrupt (software Int errupts) Percentage of CPU us
Head (head): Read and write data to disk
Track: When the disk is rotated and the head remains in one position, each head will draw a circular trajectory on the disk surface called the track. A track on a disk is a set of concentric circles with different recording densities
Sector (sector): each track on a disk is divided into segments that are sectors of the hard disk. The first sector of a hard disk, called a boot sector. The size of a sector is 512 bytes
Cylinder (cylind
primary or extended partition, and the logical partition (which is based on the extended partition) number can only start at 5
Basic requirements for partitioning for Linux systems
at least one root (/) partition is required to store system files and programs. It is at least 5GB in size
to have a swap partition, which acts as virtual memory in Windows, the size of the swap partition is typically 1.5 times times the physical memory capacity (memory "but when the system physic
maintainability. When running the JVM on multiple servers, you can also choose to run multiple JVMs on a single server or on each server to run one JVM. For example, for each server, you can run a JVM that uses 8GB of heap memory, or you can run 4 JVMs that use 2GB. You should decide this number based on the number of processor cores and the nature of the program. Using 2GB of heap memory is better than 8GB
equipped with the sixth generation Intel Core I processor, the highest 8GB DDR4 memory +512GB Solid-State Drive, Lenovo said, its CPU comprehensive ability to increase 50%, graphics performance increased by one times.
Price, 4GB+128GB Elite version of the sale of 4399 Yuan, 8GB+256GB Prestige edition 5499 Yuan, 8GB+512GB flagship edition sold 7499 Yuan, are pre
DDR4 How much memory frequency is appropriate? For computer enthusiasts, the greater the memory frequency, the faster the speed is relative. In today's latest DDR4 memory era, how much memory frequency is appropriate? Today's small series will share the DDR4 memory high and low frequency on the computer performance and CPU, graphics, game performance impact, I believe you can find the answer.
DDR4 is the memory frequency larger and faster? measured high and low frequency DDR4 memory
one, can not be used at the same time.
Comprehensive consideration of the above factors, for Intel's CPU, currently still with Google's Android simulator and HAXM GPU Accelerator is more convenient, in the computer expansion to 8GB memory, the operation speed is also fast, upgrade simple, flexible configuration, the use is also very convenient.
For ARM CPUs, Google's Android simulator is also up to speed when the computer expands to
mirrored 146GB 10K to SAS drives, and shared storage is NetApp fas3020c, with software iSCSI connectivity, The MPIO is used in the design of the storage network. The VMFS LUNs for shared storage are experiment-specific, with no other load on it, and the blade server is only an experimental VM, with no additional load. The reason why such a specific description of experimental equipment, is to express a clear meaning: server, network, storage performance is sufficient, does not cause performance
watch it go.Conditions in which the index does not take effectSo the index does not build, sometimes built is also Perkins, why? Take a look at the following case studies:Take the case to illustratePlsql optimization > A no-go index optimization caseThis example shows that if you have a word for a field that is queried by the where condition, but it is involved in the operator, it is not indexed in Oracle's internal execution plan, so we made a small change, how many times is the efficiency imp
ObjectiveThis thought there is bootcamp artifact in hand, MacBook installed win system should be a cinch, did not think really toss a. During the period because of misoperation caused by OSX also hang fell not to go to the disk to erase all the network recovery installation. In order to make people less detours, to provide a successful personal installation experience, it may not be suitable for all equipment.Windows 71. Download the 64 official image files of Win 7, not ghost or other modified
maximum size of the FAT32 support partition in Windows2000 is 32GB. ü File System : NTFS is a recoverable file system. Users rarely need to run disk hotfixes on NTFS partitions. NTFS guarantees partition consistency by using standard transaction log and recovery techniques. NTFS uses log files and checkpoint information to automatically recover file system consistency when a system failure event occurs. ü folder compression : NTFS supports compression of partitions, folders, and files. Any Wind
the computer is definitely not 8x1024=8192mConversion by the above description can be calculated when the capacity unit 1KB=8KB 1MB=8MB 1GB=8GB speed unit when 1kb/s=8kb/s 1mb/s=8mb/s 1gb/s=8gb/sFor example, first of all to give you a broadband example, we go to the operator there to install a 4M broadband, where the 4M is certainly 4mb/s, then we in the home Thunderbolt, qq whirlwind download software dow
Hardware tools:
A single PC
A U disk (8GB or more)
WIN10 installation (The children who have installed the WIN10 please disregard): Preparation work:
Download WIN10 Upgrade Assistant
Ensure that the system disk has more than 8GB of space left
Installation steps (because the process is not documented during installation, so only the main points are described in words):
protection. This set of small compiling with gigabyte F2A88XM-DS2 Motherboard, based on the fm2+ interface, the use of solid materials, stability and durability of the protection, the price is less than 400 yuan, is a cost-effective brand a88x motherboard.
Gigabyte F2A88XM-DS2 Motherboard
Memory and hard disk, the mainstream installed this year, 8GB large memory is standard, fluent degree of protection. Hard disk aspect, SSD
_ksmg_granule_size instance parameter as well to choose a larger granule size. As this parameter isn't dynamically changeable, an instance restart is required.The following table, shows granule sizes for specific SGA sizes and releases of Oracle:
SGA Size
10g granule Size
11g granule Size
11g granule SizeWith fix 8813366 installed
4MB
4MB
4MB
1gb-4gb
16MB
16MB
16MB
4gb-8gb
source project will be transplanted Android to the x86 platform, the system will not need to simulate the operation of ARM, so that Android can be installed directly on the PC or virtual machine running smoothly.
Everything's all right, just the east wind, I'll tell you what I use Android-x86 and VirtualBox to build the whole process of the handset development simulator
1. Download android-x86 System image file
First download Android-x86-2.2-generic.iso (click on the link directly), Mirror f
on the Docker command line, the Docker daemon restricts RAM to 150M and swap to 150M. As a result, a process can allocate 300M of memory, explaining why our process has not received any exit signals from kernel.More information on the differences between memory limits (–memory) and Swap (–memory-swap) in Docker commands can be found here.is more memory a solution?If the developer does not understand the problem, it may be assumed that there is not enough memory available for the JVM in the runn
programmed with JavaScript to run on the JavaScript engine (V8).compared to PHP, JSP, and so on (PHP, JSP,. NET need to run on the server program, Apache, Naginx, Tomcat, IIS. node. JS skips HTTP servers such as Apache, Naginx, IIS, and so on, without building any server software on its own. Many of the design concepts of node. js are very different from the classic architecture (LAMP = Linux + Apache + MySQL + PHP) and can provide great scalability. In a moment we'll see that node. js does no
great scalability. Also, node. JS does not have a Web container.node. JS's own philosophy is to spend the smallest hardware costs, pursuing higher concurrency and higher processing performance.1.2 Featuresnode. JS uses a model of event-driven, non-blocking I/O that makes him lightweight and efficient.① Single ThreadIn a server-side language such as Java, PHP, or. NET, a new thread is created for each client connection. Each thread consumes about 2MB of memory. That is, theoretically, a server w
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