linux - Valgrind does not show correct heap usage when run an app through shell script -

-

i using valgrind check heap allocation of archive/compression tool p7zip (7zip on windows) on linux. downloaded code here (https://sourceforge.net/projects/p7zip/files/p7zip/) , build (make all_test) , installed (./install.sh).

after installation, shell script named '7za' created @ /usr/local/bin , content reads as:

#! /bin/sh "/usr/local/lib/p7zip/7za" "$@"

also, on specified path /usr/local/lib/p7zip/7za executable of 7za placed.

now, if run valgrind test memory usage of 7za (which runs shell script) using command 2kb of heap usage.

valgrind 7za x file.7z

whereas, if directly use 7za binary high memory usage around 1mb looks real one:

valgrind /usr/local/lib/p7zip/7za x /home/z/desktop/file.7z

similary, when build code, bin directory created there containing 7za executable. if run there, again high , correct memory usage.

i trying understand difference in both approaches. why using installed app (run through sheel script) not give correct memory usage.

valgrind supposed debug memory related problems elf 64-bit or elf 32-bit exectuables. can't used shell scripts. won't able debug application using shell script.


Comments

Post a Comment

Popular posts from this blog

c# - How Configure Devart dotConnect for SQLite Code First? -

-
can configure following sample code ? when run following code, error : no entity framework provider found ado.net provider invariant name 'devart.data.sqlite' setting in machine.config <system.data> <dbproviderfactories> <add name="dotconnect sqlite" invariant="devart.data.sqlite" description="devart dotconnect sqlite" type="devart.data.sqlite.sqliteproviderfactory, devart.data.sqlite, version=4.6.287.0, culture=neutral, publickeytoken=09af7300eec23701" /> </dbproviderfactories> </system.data> after add below block code in app.config <?xml version="1.0"?> <configuration>   <configsections> <!-- more information on entity framework configuration, visit http://go.microsoft.com/fwlink/?linkid=237468 --> <section name="entityframework" type="system.data.entity.internal.configfile.entityframeworksection, entit...
Read more

java - Copying object fields -

-
what best way of copying classes when need have 2 independent variables? have simple class: public class myclass { boolean = false; string b= "not empty"; } do need make method : assign(myclass data ) { a= data.a; b= data.b; } is there automatic method copy (duplicate) objects in java? do need make method : pretty close. instead of making method, should make constructor. such constructors called copy constructor , , create them this: myclass(myclass data) { = data.a; b = data.b; } and create copy of instance, use constructor this: myclass obj1 = new myclass(); myclass obj2 = new myclass(obj1); copy constructor can tedious : using copy constructor create deep-copy can tedious, when class has mutable fields. in case, assignment create copy of reference, , not object itself. have create copy of fields (if want deep copy). can go recursive. a better way create deep copy serialize , deserialize object. why not use clone()? ...
Read more

c++ - Clear the memory after returning a vector in a function -

-
i have function processes , stores lot of data in , returns results vector of class. amount of data stored in function tremendous , want clear storage memory of function after finished job. necessary (does function automatically clear memory) or should clear memory function? update: vector<customers> process(char* const *filename, vector<int> id) { vector<customers> list_of_customers; (perform actions) return list_of_customers; } variables defined locally within function automatically released @ end of function scope. destructors objects called, should free memory allocated objects (if objects coded correctly). example of such object std::vector . anything you've allocated new must have corresponding delete release storage. try avoid doing own allocation , use raii instead, i.e. containers or smart pointers.
Read more