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capture dependencies between operations, but this is not sufficient to resolve situations where multiple replicas are written in parallel. Instead, we need to use the version number of each replica and each key. Each copy increments its own version number when processing writes, and tracks the version number seen from the other replicas. This information indicates which values to overwrite and which values are saved as a sibling version. A collection of version numbers for all replicas is calle

PROTOCOLBUF and thrift. Each time the database schema changes, the administrator must manually update the mapping from the database column name to the field tag. And Avro is a simple mode conversion every time the runtime is run. Any program that reads a new data file will perceive that the record field has changed. 4. SummaryCoding details not only affect productivity, but more importantly, the architecture of applications and software. Prorotocol Buf,thrift and Avro use a pattern to describe

same order, assuming there is concurrent write, all nodes will agree on the first message written to the user name. While full-order broadcasts can guarantee a linear write to a program, it is assumed that the nodes that read operations do not guarantee linear reads because of the latency of the message delivery, so the result of the read operation may be outdated.Of course, this can be achieved by returning the location of the most recent log messages, by querying the location, waiting for all

after another event.4. Unreliable leasesIn a distributed system, it is sometimes necessary to ensure that the storage service file is accessible only to one client at a time, because if multiple clients try to write it, the file is corrupted. You need to implement a distributed lock by obtaining a lease from the lock service before accessing the file. But sometimes this lock is not as reliable as we might think, as shown in:If the client holding the lease is 1 suspended for a reason such as a G

The script reads as follows:-------------------------------------------------------------------------------------------------------#!/bin/sh#定义变量secs=3600Unit_time=60stepts=$ (($secs/$unit _time))echo CPU usage ...;For ((i=0;iDoPs-eo COMM,PCPU | Tail-n +2 >>/tmp/cpu_usage.$$ #$$ indicates current process PID informationSleep $unit _timeDoneecho CPU Eaters:cat/tmp/cpu_usage.$$ | \awk ' {process[$1]+=$2}end{for (i in process) {printf ("%-20s%s\n", I,process[i])}} ' | \ #使用awk对收集结果进行统计分析SORT-NRK 2

"grep"echo "Cup usage is:"echo $ULINE | awk ' {print '} 'Echo-e ' \ n 'Doneecho "========================================================================================================="#查询内存和CPU使用率都较高的应用Echo-e ' \ n 'echo "========================================================================================================="echo "============================="echo "Applications with high memory and CPU utilization:"echo "============================="Echo-e ' \ n 'Cat/tmp/np.txt | While Re

View the most CPU-and memory-intensive processes under LinuxNBSP;1.CPU most occupied Top 10 processes: PS auxw|head-1;ps auxw|sort-rn-k3|head-102. Top 10 processes with memory consumption PS Auxw|head-1;ps auxw|sort-rn-k4|h ead-103. The top 10 processes for virtual memory use PS Auxw|head-1;ps auxw|sort-rn-k5|head-104. You can also try www.2cto.com ps Auxw--sort= Rssps Auxw--sort=%cpu5. Take a look at a few parameters meaning %mem the memory footprint

The following is an example of the CPU-intensive processing of MySQL, hoping to be a bit of a inspiration to friends who encounter similar problems. Generally speaking, MYQL occupies a high CPU, most of the database query code problems, too much query database. So on the one hand, to streamline the code, on the other hand it is best to index frequently used code. Wake up this morning. Machine alarm Check the load has been more than 4 Top a little bi

What to do when the computer is too CPU intensive Solve the CPU usage is too high we need to analyze why CPU utilization rate will reach 100%, we analyze it together! The reason for high CPU usage 1. The computer runs a large program, such as large games, 3D network games and so on, this situation is usually normal, such programs require more CPU resources, users will be large program exit for a period of time, the CPU utilization rate is basical

documentation:Indexed index is used to:O Quickly find the row that matches a WHERE clauseo When a junction (join) is executed, rows are retrieved from other tables.o Find Max () or min () values for a specific index columno If sorting or grouping is done on the leftmost front of an available key (for example, order by key_part_1,key_part_2), sort or group a table. If all key values are partially followed by DESC, the key is read in reverse order.O In some cases, a query can be optimized to retr

Mysql_real_connect () Client_ Interactive definition). Parameter default value: 28,800 seconds (8 hours) # The maximum number of connections supported by the MySQL server is capped, because each connection is built to consume memory, so we want the client to disconnect and free up memory when connecting to MySQL server after the corresponding operation has been processed. If your MySQL server has a large number of idle connections, they will not only consume memory in vain, but if the connectio

Tags: des style blog io ar color sp on div1. View questionable SQLSelectsubstr (To_char (s.pct,'99.00'),2)||'%'load, S.executions executes, P.sql_text from(Selectaddress, disk_reads, executions, pct, rank () over (order by dis K_reads desc) Ranking from(Selectaddress, disk_reads, executions, -*Ratio_to_report (Disk_reads) over () pct fromSys.v_$sqlwherecommand_type!= -) whereDisk_reads> -*executions) s, Sys.v_$sqltext pwheres.ranking5and p.address=S.addressorder by1, S.address, p.piece;2.

>explainselectcount (*) ascol_0_0_fromcard_received cardreceiv0_where (cardreceiv0_.statuscode= ' 1 ' orcardreceiv0_.statuscode= ' 2 ') and (cardreceiv0_.ownercardnum= ' 8757003738566209 ' orcardreceiv0_.ownerphonenum= ' 13724689717 ') andcardreceiv0_.readstatus=0\g;explain Results: **************************1.row******** id:1 select_type:SIMPLE table:cardreceiv0_ type:refpossible_keys:readStatus,ownerCardNum,statusCode,ownerPhoneNum key:readStatus key_len:5ref:const rows:2394190 Extra:Usingwhe

I. Documentation names and authorsconvolutional neural Networks at Constrained time COST,CVPR two. Reading timeJune 30, 2015Three. Purpose of the documentThe author hopes to improve the accuracy of CNN by modifying the model depth and the parameters of the convolution template, while maintaining the computational complexity. Through a lot of experiments, the author finds the importance of different parameters in the network structure, and obtains the competitive effect on the ImageNet2012 data s

Here is a summary of the steps to find the thread resource consumption problem for Linux, Sun (Oracle) JDK, in Linux, when the Java process is found to occupy a high CPU resource, and want to further find out which Java thread is consuming CPU resources, Follow these steps to find:First step: Log in to the LIUNX server where the Web service resides, and use the top command to get the CPU usage of JavaStep Two:As shown, the process ID of Java is ' 3260 ', and the next step is to monitor all threa

be achieved IDispose interface. Try the next interface in dispose of what will happen, feel or similar C + +, write a chestnut to observe what happens when the destruction.Examples of Use:third, combining destructors and Dispose ()The main problem with destructors is that it is not called immediately, but at an indeterminate time later, when garbage collection is performed. the Dispose() method also has its own problem, which is that the client does not necessarily call it. Therefore, the best

can be executed a specified number of times. For ... in Used to iterate over an array or an object's properties (to iterate over a group or an object's properties). function Define a function If ... else Used to perform different actions based on different conditions. Return Exit function Switch Used to perform different actions based on different conditions. Throw Throws (gen

parameter list according to function F. For example:>>> L = [1,2,3,4,5]>>> map (lambda x:x*x, L)[1,4,9,16,25]The reduce (f, list) function is similar to map, whose argument f function receives two parameters, and all elements in the returned list are the result of the cumulative calculation of all elements in the parameter list according to function f, such as additive/multiplicative:>>> L = [1,2,3,4,5]>>> reduce (lambda x,y:x+y, l)15>>> reduce ( Lambda x,y:x*y, l)120Then using these two functi

limit the ps_tx_buf, the position in the \net\mac80211\sta_info.h. This parameter means that a maximum of 64 packets per node can be stored. Ap_max_bc_buffer: The parameter size is 128 and is used to limit the size of bc_buf, where the position is in \net\mac80211\ieee80211_i.h. This buffer is designed to hold multicast/broadcast frames with only 1 queues. Total_max_tx_buffer: The parameter size is 512, according to the description, is used to limit the total BUFFE

the multi-stream operation mode, you need to feedback an action frame that explicitly indicates the static mode disabled, so that the next frame the AP sends will be the multi-stream mode.Is the SMPs in the dynamic mode of operation, where the AP sends a dynamic mode action frame with a single-stream mode (the downstream frame in the figure is RTS, which can actually be a data frame), followed by the downstream frame of the feedback. When the frame feedback, the AP sends the next frame, it will