Discovering Memory Leaks within The Ruby Ecosystem > 자유게시판

Till not too long ago, Ruby lacked a mechanism for detecting native-stage memory leaks from within Ruby and native gems. This was as a result of, when Ruby terminates, it doesn't free the objects which can be nonetheless alive or the memory utilized by Ruby’s digital machine. This is because the system will reclaim all of the memory used anyway, so it’s just further work that might make Ruby’s shutdown slower. Nonetheless, this meant that it was unattainable to find out whether or not a chunk of memory was leaked or was simply not cleaned up. This meant that it was laborious to investigate Ruby applications that suffered from memory leaks, causing them to eat growing amounts of memory until the system runs out and terminates the application. This is undesirable as it is an inefficient use of system resources, which might price money and efficiency, and will result in downtime for an online server. I describe in higher element in the next part and in another blog put up. Valgrind memcheck to find memory leaks in native gems.

Valgrind memcheck is a software used to find memory leaks in native purposes. Nonetheless, we can’t use it directly on Ruby as a result of Ruby doesn’t free its memory throughout shutdown, leading Valgrind memcheck to report thousands of false-positive memory leaks. Ruby doesn’t free its memory during shutdown as a result of the system will reclaim all the brainwave audio program’s memory after this system has terminated anyway, so explicitly freeing the memory would only make Ruby’s shutdown slower. Since there are tens, if not a whole bunch, of locations the place these kinds of "memory leaks" happen in Ruby at shutdown, making a feature to free all the memory at shutdown would have been very time-consuming. Ruby or a real memory leak from the native gem. Of course, the heuristic just isn't perfect and may cause false-negatives (i.e. it could actually filter out actual memory leaks). Nokogiri, liquid-c, gRPC, and Protobuf. Linux techniques since Valgrind solely runs on Linux.

Because of this we can't use a sooner memory checker like Google’s sanitizers or help other operating programs corresponding to utilizing the macOS leaks device. In 2023, Adam Hess from GitHub collaborated with me to develop a characteristic in Ruby that frees all memory at shutdown. EXIT function which instructs Ruby to free all of its memory at shutdown when the environment variable is about. By implementing this with a flag, Ruby can maintain a quick shutdown when this function just isn't wanted and solely free memory at shutdown when the characteristic is enabled. The implementation is fairly easy. Nonetheless, it’s not that straightforward, since circular dependencies made it tricky. For instance, we free Ruby objects before we free the VM as a result of freeing Ruby objects might have the VM to be alive (e.g. executing finalizers), however things like Threads and the main Ractor are all Ruby objects, so we cannot free those objects until after a lot of the VM has been freed. We then free the VM, brainwave audio program and eventually we go back and free the leftover objects that bought skipped. EXIT, we ran Ruby’s exams and Memory Wave specs by means of Valgrind and the macOS leaks software to seek out memory leaks. By way of this characteristic, we had been able to find over 30 memory leaks originating from inside of Ruby. 1. The function that checks for timeouts is changed from elevating an error when the regular expression match occasions out to returning a boolean on whether or not the match timed out. Since a elevate will leap out of the function and into the Ruby body with the rescue, it bypasses any cleanup of memory allotted for the match and thus leaks memory. By returning a boolean when the match occasions out, it allows cleanup earlier than the Regexp::TimeoutError is raised.

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