performance profiling

Tags: list AC ace set conditions select res Expr SQLThe error is as follows:[ERR] 1055-expression #1 of ORDER by clause are not in GROUP by clause and contains nonaggregated column ' Information_sch Ema. PROFILING. SEQ ' which is not functionally dependent on columns in GROUP by clause; This was incompatible with sql_mode=only_full_group_byWhy the problem occurred:MySQL 5.7.5 and above function depends on the detection function. If only_full_group_by

Memory management and garbage collection are critical points for the JVM, and it is important to understand the basic strategies of memory management and garbage collection for the analysis of Java performance. This article describes the memory management and garbage collection of Sun JVM 6.0.1. Memory ManagementIn the process of running the program, will create a large number of objects, these objects, mostly short-period objects, a small part of the

C + + 11 Adds a lot of new features. a Non-constructor that can have a significant impact on C + + performance and our design class rvalue Reference Mo! I read a lot of information, can say it is not much. I would like to use a simple example to illustrate the need for readers to understand and apply this important language construct. 1. Rvalue reference is reference (i.e. pointer)For example, the following two statements have exactly the same sem

x264 Code Profiling NotesThe basic framework of x264 is still a hybrid coding framework based on predictive + transform, as shown, including: Intra- frame prediction , inter-frame prediction , transformation and quantization , entropy coding , filtering , etc.The following is a series of articles x264 code anatomy:"X264 Code Anatomy (A): Graphic detailed x264 on the Windows platform of the building"x264 Code Anatomy (ii): How to compile the basic fram

This is a creation in Article, where the information may have evolved or changed. First, official documents Https://blog.golang.org/profiling-go-programs $CD Your_programe_dir $go Build $./your_programe-cpuprofile=xxx.prof $go tool pprof./your_programe xxx.prof Entering interactive mode (type ' help ' for commands) (pprof) Top 10 ... (pprof) Web generates an SVG file and opens Note: Mac is opened by default with sublime and needs to be modified to c

Inittab file profiling [CentOS5.X] (version 2)Inittab file profiling [CentOS 5.X] Grep-v "^ #"/etc/inittab | more # filter out rows starting #Inittab File Format Id: runlevels: action: process Id: identifier, generally two digits or letters Runlevels: indicates the running level. You can specify multiple runlevels. If it is null, the value ranges from 0 ~ 6. Execute all running levels Action: Specifies the

Python source code profiling note 0--c Language Basics Review To analyze the Python source code, C language can not be based on a few, especially pointers and structures and other knowledge. This article first reviews the C Language Foundation, facilitates the subsequent code reading. 1 About elf FilesThe target files and executables that are compiled by C in Linux are in elf format, and the executable file is divided by segment, in the

FIREBUG TUTORIAL Section 1:console tab:logging, PROFILING and COMMANDLINE (part II) Overview of Console Tab This tab is mainly used for logging. It also can be used as CommandLine windows (like immediate windows in Microsoft Visual Studio) while you are debugging the J Avascript. It can be used for monitoring the execution of the Javascript code by using Profiling service. The following topic would be cov

C compiler profiling _ 5.2.3 intermediate code generation and optimization _ access array elements and struct members through "offset" Section 5.2.3 accesses array elements and struct members through "offset" In the previous section, we introduced the access to "array elements and struct members". We use the "base address + offset" mode to calculate the address of the memory unit. For the array element arr2 [I] [2], the array index value I is a variab

C compiler profiling-managing the register for generating assembly code In a computer, the CPU speed is much faster than the memory speed. The compiler should make full use of register resources to reduce unnecessary access to the memory, this increases the speed of the compilation code generated by the compiler. In the intermediate code generation stage, the UCC compiler uses the temporary variable t to store the values of common subexpressions such

string "charger" to save it to the Is_charger variable, is_charger non 0 indicates that the previous android was started in charge mode, otherwise normal mode. The normal startup mode is different from the process that the charging mode needs to start, and the difference between the two modes to start the specific program will be described in init.rc parsing.Next, call the info macro to print a log statement, which is defined in Init/log.h and is implemented as follows#define ERROR (x ...) Kl

instruction similar to the following:Add SP, SP, #NPop {R7, PC}This instruction can be said to be everywhere, see the BOF final instructions:We first point the PC to the Add SP, SP, #0x20, you can let the SP move forward 32 bytes, just can offset the system of 32 bytes, as follows:Take a look at the addresses we are concerned about:baseaddr:0x40025000R0:0xbefffa54ADD sp, SP, #0x20:0x0000839aPOP {R7, PC}: 0x0000839cFinally, we construct the following shellcode:' chmod 6755 su ' + ' \x00 ' * + '

MyBatis openSession (), close (), and commit () underlying code profiling, mybatisopensession I. What did openSession do in the MyBatis tool class? Mybatis tool class 1 private static final String RESOURCE = "mybatis-config.xml"; 2 private static SqlSessionFactory sqlSessionFactory = null; 3 private static ThreadLocal First, open openSession to find a method for implementing sqlsessionFactory. 1 package org.apache.ibatis.session; 2 3 import java.sq

accessor class object from the XML file Earth.xml, and the object constructs the World object NewWorld as a parameter.7, M_world. The Update (Drawargs Drawargs) function calls this only if the camera height is less than 30000 meters. Terrainaccessor. Getelevationarray (b,l,s) calculates the elevation of the terrain of the user's mouse click, as follows: (1) Judging whether the terrain tile service is empty, (2) Judging if the higher resolution dataset is empty, or (3) by calling Terraintileserv

STL source code profiling algorithm stl_algo.h -- merge sort ---------------------------------------------------------------------- Description: Merge Sorting. Ideas: 1. Semi-segmentation of intervals 2. Sort the Left and Right segments separately 3. Use inplace_merge to merge left and right segments into a complete ordered sequence Complexity: O (nlog n) Source code: Template Void mergesort (BidirectionalIter first, Bidirecti

STL source code profiling algorithm stl_algo.h -- inplace_merge Inplace_merge (used in ordered intervals) -------------------------------------------------------------------- Description: if the two connected sequences [first, middle) and [middle, last] are sorted, Then inplace_merge can combine them into a single sequence, which is still ordered. Source code: Template Inline void inplace_merge (BidirectionalIterator first, BidirectionalIterat

mechanism. In fact, the Pyfunctionobject object of the inner nested function inner_func is stored in the local variable of the outer function, and the Func_closure field in Pyfunctionobject is a tuple object that stores pycellobject. When executing Inner_func, the Pycellobject object stored in Func_closure is copied to the Pyframeobject free object of Inner_func, which is the storage space behind the cell object, so that the inner _func is referenced to value by Freevars (Note that this freevar

("Fromrealsubject");}}publicclass proxysubjectextendssubject{privaterealsubjectrealsubject; The //proxy role internally references the real role @Override public voidrequest () {prerequest (); // Actions that are attached before a real-world role Operation if (Null==realsubject) { realsubject=newrealsUbject ();} Realsubject.request (); //true character completion postrequest (); //actions attached after a real-world role Operation } privatevoidprerequest () {system.out.println (" Prerequest

private method Compilemoduleunit, the main is to do some module import work, the code is easy to understand, here is not detailed analysis.Now look back, in Ironpython/hosting/pythoncompiler.cs this file, there are still two classes left to mention:Resourcefile: Represents a related property of a resource file.Pythoncompilersink: The Accepted pool of Pythoncompiler compilation results is literally understood. As to how it works, let's leave it behind for analysis.So far, we have generally seen

) } v; uint32_t type_info; } U;} Zend_refcounted_h; $a = "Time:". Time (); $a -zend_string_1 (refcount=1) $b = $a; $a, $b -zend_string_1 (refcount=2) $c = $b; $a, $b, $c- zend_string_1 (refcount=3) unset ($b); $b = Is_undef $a, $c- zend_string_1 (refcount=2) not all data types use reference counts, long, double are hard copies, and reference counts are used only if value is the type of pointer (except interned string,im