memory-leaks

Python – Working around memory leaks

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You can use something like this to help track down memory leaks >>> from collections import defaultdict >>> from gc import get_objects >>> before = defaultdict(int) >>> after = defaultdict(int) >>> for i in get_objects(): … before[type(i)] += 1 … now suppose the tests leaks some memory >>> leaked_things = [[x] for x in range(10)] … Read more

How can I create a reference cycle using dispatchQueues?

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You say: From what I understand the setup here is: self —> queue self <— block The queue is merely a shell/wrapper for the block. Which is why even if I nil the queue, the block will continue its execution. They’re independent. The fact that self happens to have a strong reference to the queue … Read more

php/symfony/doctrine memory leak?

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Tried doing $cupo->save(); $cupo->free(); $cupo = null; (But substituting my code) And I’m still getting memory overflows. Any other ideas, SO? Update: I created a new environment in my databases.yml, that looks like: all: doctrine: class: sfDoctrineDatabase param: dsn: ‘mysql:host=localhost;dbname=…….’ username: ….. password: ….. profiler: false The profiler: false entry disables doctrine’s query logging, that … Read more

What do I need to do before deleting elements in a vector of pointers to dynamically allocated objects?

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Yes Vectors are implemented using template memory allocators that take care of the memory management for you, so they are somewhat special. But as a general rule of thumb, you don’t have to call delete on variables that aren’t declared with the new keyword because of the difference between stack and heap allocation. If stuff … Read more

valgrind memory leak errors when using pthread_create

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A thread’s resources are not immediately released at termination, unless the thread was created with the detach state attribute set to PTHREAD_CREATE_DETACHED, or if pthread_detach is called for its pthread_t. An undetached thread will remain terminated state until its identifier is passed to pthread_join or pthread_detach. To sum it up, you have three options: create … Read more

In Linux, how to tell how much memory processes are using?

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Getting right memory usage is trickier than one may think. The best way I could find is: echo 0 $(awk ‘/TYPE/ {print “+”, $2}’ /proc/`pidof PROCESS`/smaps) | bc Where “PROCESS” is the name of the process you want to inspect and “TYPE” is one of: Rss: resident memory usage, all memory the process uses, including … Read more