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than 100 compilation options available. Many of these options may never be used, but some of the main options will be frequently used. Many GCC options include more than one character. Therefore, you must specify the respective characters for each option, and, just like most Linux commands, you cannot separate the characters with a set of options. For example, the following two commands are different: Gcc-p-g test. c Gcc-pg test. c The First Command tells GCC to create profile information for
GPROF IntroductionGPROF is the GNU profiler tool. The "flat"Profile, including the number of calls to each function and the processor time consumed by each function. You can also display the "Call diagram", including the call relationship of the function, and the time consumed by each function call. You can also display the "annotated source code", which is a copy of the program source code, marking the number of executions of each line of code in the
by Falcon of tinylab.org2015/04/15ReasonSource code analysis is a topic that programmers can not leave. Whether it is research open source projects, or usually do all kinds of transplant, development, can not avoid the deep interpretation of the source code.工欲善其事, its prerequisite.Previously described how to analyze the source code statically through CallGraph, here is how to analyze the actual function execution of the program runtime, taking into account that the application part and the kerne
Redis data import tool optimization process summary, redis Data ImportBackground of optimization of Redis data import tool Developed a Redis data import tool using C ++Import all table data from oracle to redis;Instead of simply importing data, the original records in each oracle must be processed by the business logic,And add indexes (redis set );After the tool is completed, performance is a bottleneck;Optimization results Two sample data tests were used:8763 records in Table a of sample data;T
running when the profile was tested.Oprofiled starts logging from the call to Opcontrol--start and intercepts the current statistic when Opcontrol--dump is called, but Oprofiled continues to collect and accumulate statistics before calling Opconrol-- Dump will have an old accumulation of data. The collection is not stopped until the Opcontrol--stop is called.(3) opgprofWe can generate a gmon.out file by Gprof, as follows:[Email protected]/]# Opgprof/
Background Developed a Redis data import tool using C + +Import all table data from Oracle into Redis;Not just data import, the original records in each Oracle, need to be processed by business logic,and add an index (Redis collection);When the tool is finished, performance is a bottleneck; Optimization effect 2 Sample Data tests were used:Sample Data a table 8,763 records;Table B 940,279 Records; Before optimization, a table is time-consuming 11.417s;After optimization, a table is time-cons
debugging information is added to the executable file. the second command only tells GCC to create profiling information for the gprof command. When you do not need any options to compile a program, GCC will create (assuming the compilation is successful) a program named. out executable file. for example, the following command will generate. out File: gcc test. c You can use the-o compilation option to specify a file name for the generated executable
introduction is to provide support for CPUs that do not have performance counters. Its accuracy is lower relative to event-based sampling. Because the OS clock interrupt support is needed, the code oprofile to disable interrupts cannot be parsed. Oprofile is divided into two parts on Linux, one is the kernel module (Oprofile.ko), and the other is the daemon for user space (oprofiled). The former is responsible for accessing performance counters or registering functions based on time sampling (r
, installing a version of the compiler can compile for all models or configurations. There are many options, not listed here, such as-mshort, that the int type is 16bit-xlinker optionPass the option to the linker, and if option has two arguments, we must use the-xlinker two times because it can only pass one string at a time. For example-assert definitions, we need-xlinker-assert-xlinker definitions.If it's a GNU linker, we can write-xlinker-assert=definitions like this, while other linker might
1. gprof tests the time consumption of each function to identify performance bottlenecks Debianerik :~ /Desktop # gcc-Wall-pg test. cDebianerik :~ /Desktop # ls-lTotal 1883988-Rwxr-xr-x 1 root 8737 a. out-Rw-r -- 1 root 1267 test. cDebianerik :~ /Desktop #./a. outDebianerik :~ /Desktop # ls-lTotal 1883988-Rwxr-xr-x 1 root 8737 a. out-Rw-r -- 1 root 537 gmon. out-Rw-r -- 1 root 1267 test. cDebianerik :~ /Desktop #
. The next section describes the options you will most commonly use. GCC options for Linux programming toolsGCC has more than 100 compilation options available. many of these options may never be used, but some of the main options will be frequently used. many GCC options include more than one character. therefore, you must specify the respective characters for each option, and, just like most Linux commands, you cannot separate the characters with a group of options. for example, the following
1603.5.2 bash script 1613.5.3 how to optimize the busybox bash script 1613.5.4. Bash script optimization 1613.6. Process startup speed: 1613.6.1. view the dynamic library loading process 1623.6.2. Reduce the number of dynamic databases by 1633.6.3. Shared library search path 1633.6.4. Dynamic library hierarchy 1663.6.5. Dynamic library initialization 1663.6.5.1. Dynamic library construction and destructor 1673.6.5.2. initialize global variables 1673.6.6. prelink 1693.6.6.1. prelink will increas
it. Here we will not mention how powerful the regular expression is. its rules can be written into a blog article separately, and many people have already done so. The following are some usage inspirations. after reading this article, we will feel that the original "search" needs are so diverse. The example is out of "program design practice": which files use the Regexp class? % Grep Regexp *. which file does the java class implement? % Grep 'class. * Regexp '*. how many blank lines does the ja
$0x402000,0x4 (%ESP)401,081:00401082:c7 movl $0x402002, (%ESP)401089:e8 F2 -xx-401180 As you can see, main () calls fopen (). Codeviz with the ability to parse the target file.Dynamic Analysis is a call to log a function while the program is running, and then organized into a call graph. Compared with static analysis, it can obtain more information, such as the sequence of function calls and the number of times, but there are some shortcomings, such as the application of some branches of the st
techniques, to write the code from the beginning with these basic principles, and to write code that doesn't require others to refactor to improve performance. In addition, some very simple techniques, such as the loop-independent complex calculations or large memory operations of the code into the loop, for the overall performance improvement is really more obvious. How do I use the code Profiler, the Performance analysis tool, to tune the code?Program profiling (profiling) is actually inse
Redis Data Import Tool optimization Process summary backgroundDeveloped a Redis data import tool using C + +Import all table data into Redis from Oracle;Not pure data import, the original records in each Oracle need to be processed by the business logic,and add an index (Redis collection);When the tool is finished, performance is a bottleneck;Optimization effect2 Sample Data tests were used:Sample Data a table 8,763 records;b table 940,279 Records;Before optimization, a watch time is 11.417s;Aft
more than one file, the total number of lines will be output. Common options: -C: number of output bytes -M: number of output characters -L number of output rows -W: number of output words (word) 6. grep Search for and display the content that matches the regular expression in the text. Here we will not mention how powerful the regular expression is. its rules can be written into a blog article separately, and many people have already done so. The following are some usage inspirations. after r
= GetTickCPU (); For (int idx = 1; idx G + = gcd (1234134, idx ); Uint64_t time = GetTickCPU ()-pretime; Printf ("% d, % lld \ n", g, time ); Return 0; } The callgrind running result is as follows: We analyze the output results using callgrind in windows and obtain the following results: 1.4.g ++ Performance Analysis Gprof is a gnu profile tool that comes with g ++ ). It embeds code into each function to calculate the function time consump
Version.h file was established successfully. Second, compiling binutils#tar-XJVF binutils-2.23.1.tar.bz2#cd binutils-2.23.1#mkdir Build CD Build#.. /configure--prefix= $PREFIX--target= $TARGET#make#make InstallWhen you are done, go to $prefix to check the generated tools.# CD $PREFIX/bin# LLThe following files are available:arm-linux-addr2line*arm-linux-ar*arm-linux-as*arm-linux-c++filt*arm-linux-elfedit*arm-linux-gprof*arm-linux-ld*arm-linux-ld.bfd
Under Linux, the assembly language uses the/T syntax, which can be used with the GNU tool, including assembler gas, connector ld, compiler gcc, debugger gdb or kdbg,objdump disassembly function, and a profile gprof. A simple example of the use of each tool in assembly language development is described in brief.These tools are to be used in the Linux environment, first set up a Linux development environment, you can refer to the article "Windows7 64-bi
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