知识大全 IronPython和C#执行速度对比

Posted 2022-07-21 速度

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　　我构思的实验覆蓋到下面几个我认为是实际项目中比较有代表性的场景

　　访问一个稍大的数据表遍历所有记录

　　生成并操作一个列表

　　生成并操作一个字典

　　通过反射动态加载并调用一个方法

　　C#部分的代码编译时使用了/debug 和/optimize+

usingSystem; usingSystem Data SqlClient; usingSystem Diagnostics; usingSystem Collections Generic; usingSystem Reflection; namespaceTest classTest publicstaticvoidMain(string[]args) Console WriteLine( C#: ); Measure(TestDb TestDb ); Measure(TestList TestList ); Measure(TestDict TestDict ); Measure(TestReflection TestReflection ); delegatevoidFuncDelegate(); staticvoidMeasure(FuncDelegatefunc stringfuncName) Stopwatchsw=newStopwatch(); sw Start(); func(); sw Stop(); Console WriteLine( used ms funcName sw ElapsedMilliseconds); staticvoidTestDb() using(SqlConnectionconn=newSqlConnection(connStr)) conn Open(); SqlCommandcmd=newSqlCommand(sql conn); SqlDataReaderreader=cmd ExecuteReader(); while(reader Read()) varid=reader[ Id ]; varcode=reader[ Code ]; varcargoCode=reader[ CargoCode ]; varlength=reader[ Length ]; varwidth=reader[ Width ]; varheight=reader[ Height ]; varvol=reader[ Vol ]; varpallet=reader[ Pallet ]; reader Close(); cmd Dispose(); conn Close(); staticvoidTestList() varlist=newList(); constintcount= ; for(inti= ;ilist Add(string Format( item i)); for(inti=count ;i>= ;i ) list RemoveAt(i); staticvoidTestDict() vardict=newDictionary(); constintcount= ; for(inti= ;idict[string Format( key i)]=string Format( value i); for(inti= ;idict Remove(string Format( key i)); staticvoidTestReflection() AssemblyAssemblyassem=Assembly LoadFrom( Lib dll ); Typetype=assem GetType( Lib TestLib ); constintcount= ; ConstructorInfoci=type GetConstructor(Type EmptyTypes); MethodInfomi=type GetMethod( GetMessage ); for(inti= ;i objectobj=ci Invoke(null);//Activator CreateInstance(type); mi Invoke(obj newobject[] name ); conststringconnStr= IntegratedSecurity=SSPI;InitialCatalog=test;DataSource= ; conststringsql= select*fromCargoPackageTypes ;

　　IronPython部分的代码:

from__future__imporith_statement importclr sys clr AddReference( System Data ) fromSystem Data SqlClientimportSqlCommand SqlConnection fromSystem DiagnosticsimportStopwatch fromSystem ReflectionimportAssembly connStr= IntegratedSecurity=SSPI;InitialCatalog=test;DataSource= ; sql= select*fromCargoPackageTypes ; deftestDb(): withSqlConnection(connStr)asconn: conn Open() cmd=SqlCommand(sql conn) reader=cmd ExecuteReader() whilereader Read(): id=reader[ Id ] code=reader[ Code ] cargoCode=reader[ CargoCode ] length=reader[ Length ] width=reader[ Width ] height=reader[ Height ] vol=reader[ Vol ] pallet=reader[ Pallet ] reader Close() cmd Dispose() conn Close() deftestList(): lst=[] count= foriinxrange(count): lst append( item%d %i) foriinxrange(count ): lst pop(i) deftestDict(): d= count= foriinxrange(count): d[ key%d %i]= value%d %i foriinxrange(count): d pop( key%d %i) deftestReflection(): clr AddReferenceToFile( Lib dll ) fromLibimportTestLib count= foriinxrange(count): obj=TestLib() obj GetMessage( name ) defmeasure(fn): sw=Stopwatch() sw Start() fn() sw Stop() print %sused%sms %(fn __name__ sw ElapsedMilliseconds) print Python: measure(testDb) measure(testList) measure(testDict) measure(testReflection)

　　运行结果