postgresql performance comparison

Introduction In distributed system, we widely use message middleware to exchange data between systems, and facilitate asynchronous decoupling. Now open source message middleware has a lot of time ago our own product ROCKETMQ (Metaq core) also smooth open source, get everyone's attention. So, what is the performance of message middleware? With this in doubt, our middleware test group performs a performance

CauseMany of the online views on high server selection, there are many controversies, such as C and Java comparison, Epoll and libevent comparison, arguing. Including Gleasy's own middleware, and often criticized and questioned, received the most is about the use of language, Gleasy middleware Most of the use of the Java language, based on the MINA2 framework, and our internal through a lot of stress testin

million times ... 11th: In the array, the position of the two elements is exchanged using splice Applicability: Applies only to array elements The code is as follows: Arr[0] = Arr.splice (2, 1, arr[0]) [0]; Brief description: It looks elegant, but in fact it's not nearly as good as a temporary variable. Performance comparisons for various modes of exchange The above listed several ways have done a comparative analysis, basically ca

{Kryo Kryo=NewKryo (); Kryo.setreferences (false); Kryo.setregistrationrequired (false); Kryo.setinstantiatorstrategy (Newstdinstantiatorstrategy ()); Kryo.register (simple.class); Output Output=NewOutput (NewFileOutputStream ("D:/file1.bin")); for(inti = 0; I ) {MapNewHashmap); Map.put ("ZHANG0", i); Map.put ("Zhang1", i); Kryo.writeobject (Output,NewSimple ("Zhang" +i, (i+1), map); } output.flush (); Output.close (); } Public Static voidGetserializableobject () {Kryo K

Connection: http://www.oschina.net/question/29420_138135 See a blog post about Golang and PHP performance comparison, here to reply.The results of this test are clearly misleading. 1,php The Opcache is not turned on, read the disk file every time. and compile php for opcode. Performance naturally will be poor, open opcache try it. 2, Php+redis must be extended

-numeric value to a numerical value. For example, PHP can perform this operation: 100 "zhoutang ", the result is 100. it is precisely because it is a weak type language, coupled with detection and conversion before the operation that leads to low performance of arithmetic operations. PHP's time for a single operation is relatively stable, and the time spent on every 10000 arithmetic addition operations is about 3.5 ms. Different calculation methods al

To the photographic enthusiasts to share a detailed comparison of Canon SX60 HS and Nikon D7100 performance comparison. Analytical sharing: Canon SX60 HS can shoot the effect of smooth 60 frames/sec Full HD short film, while in the record format using a larger compression than the MP4 format, can effectively reduce the volume of video files, e

Reasons for upgrading PHP5: Performance Comparison between PHP4 and PHP5. PHP4 will not be supported by PHPGroup by the end of this year, so I did this test to make everyone more confident to transfer to the PHP5 platform, let's see if PHP4.x is true. PHP 4 is no longer supported by PHP Group by the end of this year. so to make everyone more confident, I did this test, check if PHP 4.x has a better

How does the Fork/join framework behave under different configurations?Parallel streams in Java 8 are also mixed. The syntactic sugar of the parallel stream (Parallel stream) is exciting. There are many ways to implement concurrent programming in Java, and we want to see what the performance gains and risks are. After more than 260 tests to get the data to see, or add a lot of new ideas, here we would like to share with you.Executorservice vs. Fork/jo

) {List.push (Obj[key])}returnlist;}; Console.log (Arr.arr_unique ());Method Three Encapsulation method vararr=[1,3,5,3,5,3,4,6,2,2,2,1,7,84,34,634]; Array.prototype.arr_unique=function (){ varobj={}; for(vari=0;i This. length;i++){ varCur=arr[i];//Current Item if(obj[cur]==cur) {Alert (1111); Arr.splice (i,1); I-- }Else{Obj[cur]=cur; }} obj=NULL; return This; }; Console.log (Arr.arr_unique ()); Three common methods

elements of the string array sort reversal took about 9 ms$./test/v8test./test/arraysort.js[2015-05-10 08:22:34.324314] begin sort and reverse array which length=10000[2015-05-10 08:22:34.337588] done, first element=zzmblrhz, last ELEMENT=00G00SSMCalling costs 22326 microsecondsTotal time V8 is truly worthy of fame, the total execution is more than spidermonkey faster, but interestingly, in the internal string array of the time spent in the reversal of the SpiderMonkey rather far ahead, pending

An article about the performance analysis of the method of string null judgement, the experimental results have been given by the author, the conclusion is to use. Length==0 judgment is the most efficient, but the end of the article only a word, feeling not enough detail, so I write this article, calculate a supplement and study it. Hardware environment for program code execution: Cpu Intel T2300 1.66GHz Memory Kings

consumption purposes, but also improve theThe efficiency of replication. Thus, the efficient read operation of foreach is not difficult to understand. Also, since foreach is not suitable for handling array writes, we can draw a knotIn most cases, the code for array writes similar to the form of foreach ($array as $key + $value) should be replaced by the while (list ($key) =each ($array)). The speed differences generated by these techniques may not be obvious in small projects, but in large proj

Performance comparison of Php+mysql prepare and normal query The instance code is as follows: Run Result: Normal MySQL run 1000 data time: 0.011621 seconds Normal MySQL Run 10,000 data time: 0.07766891 seconds Normal MySQL run 100,000 data time: 0.10834217 seconds Pre-query MySQL run 1000 data time: 0.00963211 seconds Pre-query MySQL run 10,000 data time: 0.04614592 seconds Pre-query MySQL r

Performance Comparison of insert records in a php database. I am engaged in C #. recently, for some reasons, I am also learning php. I tested a piece of code today. it is very easy to write a row of records into the database. Taking a look at the execution time of this program generates a question: how is php so slow. My php environment is the phpstudy integrated environment, and the php version is 5.3.29

by Xtblock/abamonMy personal blog station: www.zy2zy.comReprint Please specify source: Http://www.zy2zy.com/apache-nginx comparison and VPS Performance Optimization Summary/ObjectiveApache and Nginx are open source, cross-platform, free HTTP server. Apache has been the most popular server since 1996, and by 2009, the Apache site has reached 100 million. The goal of Nginx design is to become an efficient ser

Test Data Volume: 10407608Num docs:10407608In the project one of the most commonly used queries, query a certain period of time data, SQL query to obtain data, 30s or soSELECT * from ' tf_hotspotdata_copy_test ' WHERE collecttime BETWEEN ' 2014-12-06 00:00:00 ' and ' 2014-12-10 21:31:55 ';After indexing the collecttime, the same query, 2s, is much faster.SOLR Index SOLR query, same condition, 72ms"Status": 0,"Qtime": 72,"Params": {' Indent ': ' true ',"Q": "collecttime:[2014-12-06t00:00:00.000z

Performance Comparison Between ISNULL and COALESCE in the paging mode of SQL Server, isnullcoalesce Preface In the previous section, we explained the data type and several notes in the string. In this section, we will continue to talk about the number of string lines, other content and interspersed content, short content, and in-depth explanation. (For details, see "Data Types in SQL Server".) Paging Mode I

In php, use in_array () foreacharray_search () to check whether the array contains the Performance Comparison. phpforeach two-dimensional array. Php uses in_array () foreacharray_search () to check whether an array contains the same performance. phpforeach uses a two-dimensional array to determine whether a character is included in an array, I just used in_array

, duration:148 sec.C converted Double Precision whetstones:67.6 MIPSReal 2m 28.88sUser 2m 28.25sSYS 0m 0.02SVi. Summary Run timeThe same program, the same number of cycles, takes 8.698 seconds to run on the Intel CPU and takes 148.88 seconds to run on the Qualcomm CPU.It can be concluded that in floating-point arithmetic, the Intel Pentium dual-core CPU E5300 2.60GHz is 17 times times stronger than Qualcomm Snapdragon S2 MSM8255 1.0GHz. According to the Intel Moore's law, every 18 months, the CP