C Dynamic Memory Debugging with Valgrind
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- čas přidán 4. 02. 2015
- Demo of how to use the free valgrind tool under Linux to debug dynamic memory access problems in a C program. Shows how to install and run the tool, interpret its output, and fix errors. Video also shows a number of common dynamic memory programming errors with C.
One of the better valgrind tutorials. Nicely done.
it's great. For those of you guys that dont get the line of the error or mem leak then follow this: compile it with "-g" . gcc -g test.c -o test and then valgrind --track-origins=yes --leak-check=full ./test
One of the best valgrind tutorials. Covers pretty much most base cases. Neatly explained.
Great Debugging Tutorial with Valgrind!
The best tutorial I've ever seen.
I think that in test 2 line 20 there is a problem with the allocation. You are allocating an array of 5 pointers instead of 5 long longs, it should be *weights in the brackets. Valgrind can't detect it because the size of long long is 8 bytes which is the same as the pointer size on a 64bit machine(In most cases). If you would swap that long long out with an int it would fail probably.
Up up.
Nice observation!!!
It's line 19, right?
That's dead eye. Good observation.
That's why I always go through comments after I watched the videos.
You're a hero.
we deserve
Thanks for this instructive video.
Basic examples, but very useful to approach Valgrind features.
Excellent, this was so helpful. Thanks a lot
Thanks for this amazing video, my friend!
thank you! it was very helpful :)
Thank you very much. That was very well explained. Good job. I am assuming that you are an professor and thus I can believe that your students are benefiting from paying the excessive tuition being charged today.
thank you thank you! for these tips!
You're fantastic dude...
That was very helpfull. Thank you!
Very Good Lecture ...Easy to understand by different types of Problem...i request you to please do one lecture on Makefile. types of makefile how to implement...
amazing tutorial.. Thank you so much
it's great thx for that. For those of you guys that dont get the line of the error or mem leak then follow this: compile it with "-g" . gcc -g test.c -o test and then valgrind --track-origins=yes --leak-check=full ./test
Great lecture, thanks.
Thanks for the Tutorial
Nice video! Thanks. Btw r u a Canuck? :)
Very helpful... thanks!
thank you! that was helpful.
Nice. Do you think you might do a hands-on video on the topic of interpreting kcachegrind views to improve performance, based on outputs from callgrind, cachegrind, helgrind?
Very informative Thank you !!!
This is really helpful. Thank you for posting it! I'm currently debugging my unit test and trying to trace an error similar to what came up in your fourth test. Would it be okay if I messaged you a few questions about valgrind? I could really use some advice. :)
*THANKS A LOT !!!!*
Thank was very helpful. Thanks
Thank you for awesome video. Do you have plan to create video about memory profilers for windows - Visual Leak Detector or Deleaker?
Very good video.
thank you brian.
Amazinggg THANK YOU!
Are the sample code samples used in this tutorial available online?
very useful thankyou! Its probably been said already but its pronouned 'val grinned' aparently its named after the gate to valhalla
Nice, good job.
Very nice sir thank you
wow...! who taught you all these?....awesome tutorial..!
thanks dr faser
Thanks for the tutorial! After valgrind completes the messages it says "segmentation fault" at the end. Does someone know what can be causing that?
Thanks!!
thank you so much ;-;
Thanks sir
Thank you
What version of Valgrind is this?
There's some character which contains 0 0 7 F surrounded by a square at 15:33. What does that mean?
Hello, Can you tell me which tool can be used to Analyse Stack memory?
thanks ))
Awesome
7:04 Why not a sizeof(heights)? In your case it will be probably allocated malloc(3 * sizeof(8)), because pointer to int size is 8 bytes.
heights is a pointer. sizeof a pointer has nothing to do with what it might point to.
Why is sizeof(weights) correct instead of sizeof(* weights) ?
In test 1 the pointer was de-referenced in malloc(), but not in test 2.
Actually it is incorrect. It just happens to yield the same result as sizeof(long long) == sizeof(long long*).
how to fix the last error?
+tivrfoa you don't return strings/char-array in c. You make a char array before calling the method and passing its pointer as a parameter and this way you can change the string.
Hello DrBFraser could you please post a video on "How to install valgrind on Linux"
I am finding difficulties with './configure' and 'make'.
Just groping in the dark with no absolutely no clue on how to go about installing valgrind.
+ASHISH KOKARE I don't know if you still need help so please ignore this if you don't. Its actually pretty easy to build valgrind from source. I recommend you to create a new directory in you home directory. Mine is called Quellcode (thats german for source code). Download valgrind from valgrind.org. Unpack it in the directory you just created. There now should be a new directory called valgrind. Change into this directory. Then run ./configure. After that run make. Finally run sudo make install. That should be it. I hope this helps.
Hello Bro,
How to find memory leakage of python Django application with valgrind tool
This is for linux only??
sizeof(weights) on line 20 should be sizeof(*weights)
how to do it in cpp?
I'd give more thumbsup if I could.
in line 20 it should be sizeof(*wieghts)
now I see! I can see!!!
You sound like Khan from KhanAcademy
automatic scalling
Talk of barcelona
He sounds like Khan Academy
what is the password?
dude sounds just like khan academy
didn't helped me at all , I got "by ADDRESS ???"
I understand your source code. Better freebsd, openbsd, aix, debian. Umm beginner advanced C/C++, please talk of makefile why know little.
This tutorial are for beginners.
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Umm, take lottery with matematicals with C.
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Umm mostly libraries harder *.C are portable to windows.
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Make code of 100 or 200k in C/C++.
But C/C++ need perl, awk
Ummm to make game need matematicals.
Don't work with windows
Like learn medicine, don't have much money in this moment to go university.
Like are doctor, know much of all.
Are very old with computers and network.
You talk of source code to beginner, talk of artificial intelligence, for example bots of irc.
Have 22 or 23 portables, Dell, leonovo, hp, acer, much Macintosh for example Mac pro xeon and imac with chip m1, 6 or 7 Macintosh portables and imac.
In free time make laboratory, huhuu configure bios of various portables and write much Unix, make ftp with Unix bsd are nightmare.
To write frebsd 12.2 with 39 gigabytes, huhu to 600 megas need more 6 hours.
Your tutorial of are to children of 13 years, are very easy.
With C/C++ with various source codes can make 4 sprites with makefile.
Make little game in C, how xbill are easy.
Download pdf tutorial and html tutorials.
46 years of Catalonia, first computer dragon 64k with Unix and spectrum 128k more later pc xt without hardisk.
Your source code are easy, please talk of opengl, know someone librarys but know little SDL2, your source code are ridiculous.
Repair computers how Intel or imac, are easy to me.
I am asperger and tda, little schizophrenia.
Pensionist and disabled 33%, ummm don't tittle, tecnic engineer in 3 months, almost engineer of network.
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My name is ivan and have wife.