9010 aio

Innodb_read_io_threads=8Innodb_write_io_threads=8This parameter can improve performance on Linux platforms based on further changes in CPU cores, and more read operations can increase the number of read_io_threads. You can see it in the file I/O section via show engine InnoDB Status\g, as follows:FILE I/O--------I/O thread 0 state:waiting for completed AIO requests (insert buffer thread)I/O thread 1 state:waiting for completed

Some unexpected events often occur during network program debugging. For example, if a TCP service fails to be created, you must check the network conditions of the system, the most common network packet capture mode is not Wireshark. However, you often only need to check the usage of a port. It is occupied by the process (corresponding to the PID), or you need to kill it. If you are in a Windows operating system, you can run the netstat command to query the PID, and then open the task manager t

How to see which process the port number is occupied by In the process of debugging a network program, often some unexpected things happen, such as the creation of a TCP service failure, this time often need to look at the network situation of the system, the most commonly used network grab package of course Wireshark mode. But often you just need to look at the usage of a certain port, which is occupied by that process (the corresponding PID), or you need to kill it. If you are in the Windows o

MAXAIO causes Oracle to start the hang problem Oracle database, 10.2.0.4 for linux x86. When it restarts normally, it freezes to the open stage. On the operating system, the CPU usage of some user processes started due to scheduled tasks is almost 100%, which is obviously waiting. The trc file is also quickly generated in the bdump directory of Oracle. The key points of these files are as follows: WARNING: io_submit failed due to kernel limitations MAXAIO for process = 0 pending

processesThe most commonly used input/output (I/O) model in a Linux system 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. But in someIn some cases, I/O requests may need to overlap with other processes. This functionality is provided by the Portable Operating System interfa

device resource is available to release the Sigio signal, the third parameter is poll_in when read, and the third parameter is poll_out when writable, the template is as follows static ssize_t xxx_write(struct file *filp,const char __user *buf,size_t count,loff_t *ppos){ struct xxx_dev *dev = filp->private_data; ... //产生异步读信息 if(dev->async_queue) kill_fasync(dev->async_queue,GIGIO,POLL_IN); ...} Finally, to remove the file from the asynchronous notification list

Asynchronous Io of Aix requires support from Bos. rte. AIO file sets. # Lslpp-l bos. rte. AIOFileset Level State Description----------------------------------------------------------------------------Path:/usr/lib/objreposBos. rte. AIO 5.3.0.62 committed asynchronous I/O ExtensionHow to enable AIO -# Mkdev-l aio0Aio0 available # Chdev-P-l aio0-A AutoConfig

Asynchronous First, talk about asynchronous IO (Aio) In HP-UX, when synchronous IO is used, this means that the previous IO must return the "successful write" information before the next write Io, and see a performance bottleneck in the synchronous IO mode in a system with a larger IO load. In the case of asynchronous IO, the operating system immediately returns to the application a successful message after the write request is sent, and the rest is d

problem is that the server's io-wait is relatively high, after all, downloading this is Io-bound task. Nginx supports the Linux Native AIO, so I'm thinking about using AIO to significantly reduce io-wait? Should there be a noticeable improvement in performance? There are some information on the internet, boasting nginx AIO performance promotion, magic and so o

------------------------2018-02-24 18:52:09 2b6677e07700--the time when the deadlock occurred(1) TRANSACTION:(2) TRANSACTION:--Status of transaction 2------------Transactions # # # contains statistics about INNODB transactions (transaction)------------Trx ID Counter 5892Purge done for Trx's N:o History list Length 3LIST of transactions for each SESSION:---TRANSACTION 421297007339344, not started0 lock struct (s), heap size 1136, 0 row lock (s)--------FILE I/O # # #显示了I the status of/O Helper thr

1. Windows PlatformRun the following command in the Windows console:Netstat-nao | findstr" 9010"TCP 127.0.0.1: 9010 0.0.0.0: 0 listening 3017 You can see that a process with a PID of 3017 occupies port 9010. If you want to know its process name, you can use the following command: Tasklist | findstr" 3017" If you want to kill the process, you can use the me

Http://www.cnblogs.com/chenwenbiao/archive/2012/06/24/2559954.html1. Windows platform is executed under Windows console window: Netstat-nao | Findstr "9010"View Port command: Netstat-naoFind the port (9010) and the process PID command using that port: Netstat-nao | Findstr "9010"You see that the PID 3017 process takes up 9010