The author introduces: Zhang, the Chinese Academy of Sciences Master, continuous entrepreneurs, the founder of Music home app, tabby cat Quick ask co-founder, Link Bao Technology co-founder, concerned about the development of EOS public chain, dedicated to EOS-based DAPP application practice and product research.EOS has recently brushed its eyeballs again. Let EOS brush eyeball is the EOS public chain of Memory (RAM) Price in just 2 weeks from 0.017 E
1. Strange phenomenon
1. During on-site debugging of a project, the application software system reports "operation failed" when obtaining server data. The log feedback is: WCF communication timeout!
2. After repeated tests, we found that not all operations will fail, and simple operations such as logon, addition, deletion, modification, and query can run normally, the operation fails when obtaining a large data volume.
3. On-site environment: Dell r710
pressure of your database, This is the only time to consider a cluster architecture approach, which I'll focus on later. optimization of single-machine MySQL databaseFirst, the impact of server hardware on MySQL performance① disk seek capability (disk I/O), we are now on the SAS15000 drive. MySQL every second in a large number of complex query operations, the amount of read and write disk can be imagined. Therefore, the disk I/O is generally considered to be one of the biggest constraints on M
disk array, it is important not to try to use Raid-5,mysql on the RAID-5 disk array as quickly as you might expect.②CPU for MySQL applications, it is recommended to use Dell r710,e5620 @2.40ghz (4 Core) * 2, I now prefer the Dell R710, also used as a LINUXAKG virtualization application;③ physical memory for a database server using MySQL, the server memory is recommended not less than 2GB, recommended to us
configuration, so that users can have more general memory to use. HMA occupies the address 100000h ~ 10 ffefh.Extended memory: the area from the end of HMA to the maximum physical memory of the system is the extended memory. When an OS runs in protected mode, it can be accessed, but in real mode, it cannot be accessed (unless using some hacker methods ). Its address range is 10fff0h ~ Last address of system momory (maximum of 4G-1 m ). Technically, HMA is also an extended memory, depending on h
to disk I/O constraints, MySQL performance will be very low! To solve this problem, consider the following solutions: Use a RAID 1 + 0 disk array. Do not try RAID-5, the efficiency of MySQL on the RAID-5 disk array is not as fast as you expected.
② For MySQL applications, we recommend that you use DELL R710, E5620 @ 2.40 GHz (4 core) * 2. I like DELL R710 now and use it as a akg virtualization application;
bash-3.2# PRTDIAG Report General System Information Systems Configuration:vmware, Inc. VMware Virtual Platformbios Configuration:phoenix Technologie S LTD6.00 ./ Geneva/ .= = Processor Sockets ====================================Version location Tag-------------------------------- --------------------------Pentium (R) III CPU Socket #0Pentium (R) III CPU Socket #1= = = Memory Device Sockets ================================Type Status Set Device Locator Bank Locator------- ------ --- -----------
Terminology: The phone's own memory and mobile cardMobile RAM, ROM, and memory cards.First explain the relationship between the phone's RAM, ROM, and memory card. Both the RAM and ROM of the phone belong to the semiconductor memory. The ram of the cell phone is the memory that we often say, it is the abbreviation of ra
Introduction in Linux, there is a special feature-initializing the memory disk initrd (initial RAM disk) technology, and the kernel supports compressed file system images. With these two features, we can enable Linux to initialize memory disks from an early stage.
Introduction
In Linux, there is a special feature-initializing the memory disk initrd (initial RamDisk) technology, and the kernel supports compressed file system images. With these two fun
Memory ManagementIf you encounter the most important problem in writing a Windows CE program, it must be a memory problem. A wince system may only have 4 mb ram, which is very small compared to a PC, because the standard configuration of the PC has reached 128 MB or more. As a matter of fact, the memory of the machine running wince is very insufficient, so sometimes it is necessary to sacrifice the overall performance of the program to save memory whe
1.PRMFile structure
The PRM file consists of six components based on the different information contained. Here we only discuss the three components closely related to the memory space ing.
Segments... End
Define and divide all available memory resources of the chip, including program space and data space. Generally, we define a program space as ROM and a data space as Ram. However, these names are not keywords reserved by the system and can be modi
WRT 54g. This should beThe earliest specification in the route is good, but the hardware version has been updated many times.(Novice) Note that the hardware configuration may vary depending on the version number, including the PCB sub-shapes.V1.0: this is the earliest release. The following CPU model is configured: Broadcom 4710 @ 125 MHz flash = 4 m, Ram = 16 m wireless network card uses the minipci card of the Broadcom ChipV1.1, in addition to the u
),Only startup. s and Main. C Programs are included. One is assembly code and the other is the C language entry.We can intuitively see the necessary initialization steps before the system runs into the C language.
Resetentry|+++ Sys_rst_handler|+++ Initsystem|+++ Initmemory|++|++ Copy Rom to ram|++ Set up SVC Stack|+++ Remap memory|++ Goto main (in Main. c)/* Initialize the hardware.Load, execute, and Debug Programs and operating system kernels. */
3
WRT 54G This should beThe first form of the route is good, but the hardware version has also been updated many times.(Novice) Note that the hardware version number is different, hardware configuration will also have some differences, including PCB board shape may not be the same.V1.0: This is out of the earliest, configured with the following CPU model Broadcom 4710 @ 125MHz flash=4m,ram=16m wireless network card using Broadcom chip miniPCIV1.1 versio
be as fast as you expected, if the funds permit, you can choose SSD to replace the SAS hard disk with Raid 1 + 0.
2. The impact of CPU on MySQL cannot be ignored. We recommend that you select a CPU with powerful computing power. We recommend that you use DELL R710 (dual quad-core), which is also a selling point of its powerful virtualization and database capabilities.
3. For a Database Server using MySQL, we recommend that the memory of the Server be
Tags: mysql innodb Received SMS alarm, is a R710 hard disk (Raid58 block) Bad 1, contact room replacement hard disk, because of the slot problem changed a few new hard drive after the bright yellow light, and the original 1 hard disk after the change, bright green, after a few minutes machine downtime .... After the analysis is the motherboard problem, it also found 1 new r710 will not light the machine o
Turn others, can not find the original source, feel the author. Storage principle:
In order to facilitate readers at different levels to understand the basic article, so I first to introduce a lot of users know things. The main function of RAM is to store code and data for the CPU to call when needed. But the data is not as simple as a bag of rice, but more like a library with a Plaid bookshelf to store books, not only to put in and to be able to make
Bit
It is an IP address of a single position in the 20 h. 2fh Area of the internal data storage space, or a 8051-bit address that can address SFr.
CodeIs a Code address between 0000 h .. 0 ffffh.
Data
It is a data storage address between 0 and 127, or a special function register (SFR) address within the range of 128 .. 255.
IdataIs an idata storage address in the range of 0 to 255.
Xdata is an xdata storage address in the range of 0 to 65535.
Relationship between pointer types and storage areas
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