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When installing Oracle, you need to adjust the linux kernel parameters. But what does each parameter mean? The following is a detailed explanation. Minimum: fs. aio-max-nr1048576fs.file-max6815744kernel.shmall2097152kernel.shmmax4294967295kernel.shmmni4 given in Oracle official installation documentation When installing Oracle, you need to adjust the linux kernel parameters. But what does each parameter mean? The following is a detailed explanation. T

AIO (all in one) appears. This project was initiated by some members of the Start Ubuntu team. the aio dvd of Ubuntu allows you to try Ubuntu Unity, Lubuntu, Xubuntu, and, different versions such as Kubuntu and Ubuntu Gnome. Of course, Ubuntu AIO also has some disadvantages. First, it is too large, with nearly 4.7 GB. Therefore, it is not suitable for the Stand

{Code...} phpinfo () swoolesupportenabledVersion1.7.19Authortianfeng. han [email: mikan.tenny@gmail.com] epollenabledeventfdenabledtimerfdenabledsignalfdenabledcpuaffinityenabledspin... vagrant@vagrant-ubuntu-trusty-64:~$ php server.php $http = new swoole_http_server("0.0.0.0", 9501);$http->on('request', function ($request, $response) { var_dump($request->get, $request->post); $response->header("Content-Type", "text/html; charset=utf-8"); $response->end("Hello Swoole. #".rand(1000, 999

performance. Using asynchronous I/O will increase the I/O traffic, this advantage is even more obvious if applications operate on bare devices. Therefore, applications such as databases and file servers often use asynchronous I/O to execute multiple I/O operations at the same time. Oracle does not use Asynchronous IO by default. You can view the filesystemio_options parameter (default value: none). There are four options: ■ ASYNCH: enable asynchronous I/O on file system files, which has no timi

, because in the active query most of the query is doing no work. Both are available for asynchronous events with notifications. And for without notice, you can only use active query.(3). / oBack to I/O, whether I or O, access to peripherals (disks) can be divided into two phases: request and execution. The request is to look at the status information of the peripheral (such as whether it is ready), and execution is the real I/O operation. Prior to Linux 2.6, only "request" was an asynchronous e

Xen Network * Bridging Network * Routing network * Virtual LAN with Nat Bridging Network Time for Action-using bridged networking 1. The default network setting in xen is bridging, which can be further confirmed by viewing xen in the configuration file (/etc/xen/xend-config.sxp, it should have the following two rows without comments. (Network-script network-bridge) (Vif-script VIF-bridge) 2. Create a new configuration file for domu. You can use any image or other image you have created

Introduction: NiO applications on the server have been widely used. However, there are not many instructions on the use of NiO on the client. At the same time, in my opinion, NiO is used on the client to add an event-driven framework to the original persistent connection mode. Compared with the short connection pool mode, is the performance really outstanding in any environment, actually not. Recently, the TB cache client needs to be optimized. The original code is written in NIO, but the effici

1 watchdog/05 1 migration/16 1 ksoftirqd/17 1 watchdog/18 1 migration/29 1 ksoftirqd/210 1 watchdog/211 1 migration/312 1 ksoftirqd/313 1 watchdog/314 1 events/015 1 events/116 1 events/217 1 events/318 1 khelper19 1 kthread24 19 kacpid100 19 kblockd/0101 19 kblockd/1102 19 kblockd/2103 19 kblockd/3106 19 khubd197 19 pdflush198 19 pdflush199 1 kswapd0200 19 AIO/0201 19 AIO/1202 19

) -- -- 16. Online Virus Detection Http://www.virscan.org/ 17. sql2008 Http://www.microsoft.com/sqlserver/en/us/get-sql-server/try-it.aspx Ms official:Simplified ChineseSelf-decompressed versions, including x86 and x64 downloads (I have not downloaded this self-decompressed version because of AIO installation CD) Http://care.dlservice.microsoft.com/dl/download/1/E/6/1E626796-588A-495C

TCP concurrency, because it adopts the "polling" mechanism, when the number of concurrency is high, its operation efficiency is quite low, and the I/O events may be unevenly distributed, resulting in "hunger" for some I/O connections. If epoll or AIO is used, there is no such problem (the AIO technology of the early Linux kernel was implemented by creating a thread for each I/O request in the kernel, this

Transferred from: http://blog.chinaunix.net/uid-26000296-id-3754543.htmlIntroduction:Linux? The most commonly used input/output (I/O) model is synchronous I/O.In this model, when a request is made, the application blocks until the request is satisfied.This is a good solution because the calling application does not need to use any central processing unit (CPU) when it waits for the I/O request to complete.In some cases, however, I/O requests may need to overlap (parallel) with other processes.Th

block the operation of the program unless a thread is created for each TCP connection I/O. However, too many threads cause huge overhead for Thread Scheduling by the system. Therefore, it is not advisable to use synchronous I/O in the case of high TCP concurrency. In this case, you can consider using non-blocking synchronous I/O or asynchronous I/O. Non-blocking I/O synchronization techniques include the use of select (), Poll (), epoll and other mechanisms. The asynchronous I/O technology is t

programming and one of the first IO models supported by the OS, and the disadvantage is that system calls block user dynamic thread execution, which results in wasted CPU time and low IO efficiency.2. nonblocking I/O, one of the improvements to this IO model is that IO is nonblocking, but requires long polling and also wastes CPU clock cycles.3. I/O multiplexing (SELECT, poll and Epoll), this IO model is the most stable IO model provided by today's OS, and most of the mainstream applications ar

files, row lock design, MVCC, transaction and non-transaction options, and better processing performance of BLOB character types. Chapter 2 InnoDB Storage engine 2nd InnoDB Storage engine overview is developed by Innobase Oy. Its founder and linus are alumni of the University of Helsinki in Finland. 2.2 InnoDB architecture (1) Background Thread ① Master Thread is responsible for Asynchronously refreshing data in the buffer pool to the disk to ensure data consistency, including dirty page refres

Sometimes we want to execute a part of the work asynchronously by creating a thread so that we can continue to perform other tasks while executing the TASK. however, If this demand is more frequent, creating and destroying threads frequently leads to a lot of performance loss. This problem can be avoided if we can create one or more threads and then reuse Them.The implementation of QEMUQemu imitates glib realizes the function of thread pool, the current QEMU thread pool is mainly applied to the

"Mr. Wang, today we will talk about AIO and device drivers. This is the last section of device-driven notifications and asynchronous IO. Next time we will begin to talk about more advanced things, such as interruptions, clock, etc" In the Linux kernel, each IO request corresponds to a kiocb struct, and its ki_filp Member points to the corresponding file pointer. Through is_sync_kiocb, you can determine that a Kiocb is a synchronous IO request. If it i

to the process. IO Two stages, the process is non-blocking. linux provides an AIO library function for asynchronous, but rarely used. There are many open-source asynchronous IO libraries, such as Libevent, Libev, LIBUV, and so on. The asynchronous process is as follows: 2.5.3 process description user process after initiating aio_read operation, you can begin to do other things immediately. On the other hand, from the perspective of kernel, when it r

concurrency, but because of its "polling" mechanism, when the number of concurrent high, its efficiency is very low, and there may be an I/O event dispatch uneven, causing the I/O on some TCP connections "hunger" phenomenon. If you use Epoll or AIO, there is no such problem (the AIO technology implementation of the earlier Linux kernel is implemented by creating a thread for each I/O request in the kernel,