kodak aio

ing shmmax. /Proc/sys/kernel/shmmax Shmmni 4096 /Proc/sys/kernel/shmmni File-max 6815744 /Proc/sys/fs/file-max Ip_local_port_range Minimum: 9000# Maximum: 65500 /Proc/sys/net/ipv4/ip_local_port_range Rmem_default 262144 /Proc/sys/net/core/rmem_default Rmem_max 4194304 /Proc/sys/net/core/rmem_max Wmem_default 262144 /Proc/sys/net/core/wmem_default Wmem_max 1048576 /Proc/sys/net/core/wmem_m

asynchronous without notification. for synchronized events, you can only do this in a blocking manner. For asynchronous events, blocking and non-blocking are all possible. There are two ways of non-blocking: actively querying and passively receiving messages. Passive does not mean that it is not good, here it is precisely the more efficient, 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

#bytes=1 p3=0 obj#=77141 tim=1365215140965453WAIT #47769055380448: nam='asynch descriptor resize' ela= 10 outstanding #aio=0 current aio limit=152 new aio limit=182 obj#=77141 tim=1365215140965882WAIT #47769055380448: nam='direct path read' ela= 227 file number=4 first dba=523 block cnt=13 obj#=77141 tim=1365215140966341WAIT #47769055380448: nam='direct path rea

1. Check that the df-htmp space must be greater than 1 GB of available temporary space. The disk space must be greater than 20 GB. 2. vietcsysctl. conf describes the Minimum requirements. If you find that the existing parameters are larger than this, you do not have to modify them. Fs. aio-max-nr1048576fs.file-max6815744kernel.shmall2097152kernel.shm 1. Check that the df-h/tmp space must be greater than 1 GB of available temporary space. The disk spac

Linux's I/O mechanism has gone through several stages of evolution: (1) Synchronous blocking I/O: User processes perform I/O operations until I/O operations are completed. (2) non-blocking I/O synchronization: the user program can set the O_NONBLOCK attribute of the file descriptor, and the I/O operation can return immediately, but it does not guarantee that the I/O operation is successful. (3) asynchronous blocking I/O: User processes can block I/O events, but I/O operations are not blocked. Th

scheme.There are 2 implementations of IO multiplexing for Linux systems: select epoll In the version of the Linux 2.6+, NIO is using a epoll function in the 2.4.x version select . epollthe function is much better in terms of performance select , and here you don't care about the specifics of Linux programming. It is worth mentioning that the bottom of Java's Netty network framework is the use of NIO technology.AioReview the NIO: Use the listener thread to invoke the select fun

context wrapper, Filter, Interceptor, business code all levels and business logic, Access to the database, access to files, rendering results and so on, in fact, the entire process thread is suspended, so this part of the resource is very limited, and if the large file operation is an IO-intensive operation, a lot of CPU time is free, the method is the most direct, of course, increase the number of threads to control, Of course, the memory is large enough to have enough space to apply for the t

Copy Code code as follows: ------------------------------------- INSERT BUFFER and adaptive HASH INDEX ------------------------------------- Ibuf:size 1, free list len 398, SEG SIZE 400, and purge thread, which should purge all the transactions: Copy Code code as follows: ------------ Transactions ------------ Trx ID Counter 0 16644 Purge for Trx ' s N:o Also make sure that the InnoDB no longer writes: Copy Code code as fol

1. Install the Nginx on the CentOS systemin the CentOS6 version of the Epel source, the Nginx RPM package has been added, but the RPM package version is lower. If you need an updated version, you can use the official RPM package, or compile the installation using the source package. You can also use some of the two development enhancements of the Nginx version, such as Taobao's Tengine and openresty are good choices.1.1 Common compilation parameters --prefix=path: Specifies the Nginx installat

be invoked in cleanup () Allow the safe function to be invoked in cleanup () Here take umount02 as an example to compare the differences between the old and new frames: Old Frame code: Example using the old LTP library//https://lwn.net/articles/708250/#include New Frame code: Example using the new LTP library//https://lwn.net/articles/708251/#include 1.5 test Execution 1.5.1 Overall Test We can test all the test sets, run the RUNLTP command directly will test all the test

, query ID 2141628314 127.0.0.1 rootShow Engine InnoDB Status--------FILE I/O--------I/O thread 0 state:waiting for I/O request (insert buffer thread)----can see 10 IO threads, namely insert buffer thread,I/O thread 1 state:waiting for I/O request (log thread) log thread, read thread, write threadI/O thread 2 state:waiting for I/O request (read thread)I/O thread 3 state:waiting for I/O request (read thread)I/O thread 4 state:waiting for I/O request (read thread)I/O thread 5 state:waiting for I/O

state:waiting for I/O request (write thread) I/O thread 7 state:waiting for I/O request (write Threa d) I/O thread 8 state:waiting for I/O request (write thread) I/O thread 9 state:waiting for I/O request (write thread) Pend ing normal AIO reads:0 [0, 0, 0, 0], Aio writes:0 [0, 0, 0, 0], ibuf aio reads:0, log I/O ' s:0, sync I/O ' s:0pending Flushes (Fsync) log:

information show/hide log messagesM: Sort according to memory usage sort processes by MEM usageN: Show or hide network status Show/hide networks statsP: Sort processes by name based on process nameQ: Quit glances quitS: Show or hide the sensing state Show/hide sensors stats (only available WITH-E flag)U: Show Network I/o cumulative Usage View cumulative networking I/OW: Delete Read warning log information delete finished warning log messagesX: Delete Once warning and critical log information de

users is as follows:Mt-clone such as: Mt-clone adminstrator Iusr_xodu5ptt910nhoo As shown in Figure 8. Figure 8 It is to clone the Admin account administrator as Iusr_xodu5ptt910nhoo account. Finally, execute the net user Iusr_xodu5ptt910nhoo n3tl04d command, and modify the Iusr_xodu5ptt910nhoo password to n3tl04d. 4. Using AIO clones AIO (all

message can not do other things, then the mechanism is blocked. Non-blocking calls Threads are active and can handle other things. When the bank handles these business, while calling and sending text messages while waiting, this state is non-blocking. Examples of combinations between them: Blocking calls Non-blocking calls Sync mode Read/write Read/writeO_nonblock Asynchronous mode IO mul

The AIX 6.1 operating system has Oracle 10g installed on it, but always dbca the Ora-12547:tns:lost contact error when creating an instance. There are a number of possible causes for this type of problem due to the availability of relevant materials on the Web. And I this is due to AIX asynchronous AIO problem The current environment AIO is set to defined, modified into available That Smit

--http-log-path=path defines the log store path of the file being accessed, if Access_log is not specified in nginx.conf, the default is --pid-path=path when the PID file path is not specified in nginx.conf using PID, the default is The--lock-path=path lock file holds the route, and if not specified in nginx.conf, the default is --user=user The default is nobody if the owner is not running with user-defined processes in nginx.conf --group=group If you do not use user-defined group in n

thread) I/O thread 6 state:waiting for I/O request (write thread) I/O Thread 7 state:waiting for I/O request (write thread) I/O thread 8 state:waiting for I/O request (write thread) I/O thread 9 state:waiting for I/O request (write thread) Pending normal Aio reads:0 [0, 0, 0, 0], AIO writes:0 [ 0, 0, 0, 0], ibuf aio reads:0, log I/O ' s:0, sync I/o ' s:0

function does not block the current thread and returns immediately before the result is immediately available. IO model whether to block Whether to sync Blocking IO Blocking Synchronous Synchronous non-blocking IO Non-blocking Synchronous IO multiplexing Blocking Synchronous Aio Non-blocking Asynchronous 2. Synchronous blocking IO (blocking I