One example would be when the program uses a 3rd-party C++ library that allocates memory. It is possible (even common!) for a Java program to allocate non-heap memory that is not managed by Java.Comparing these snapshots (using a tool like YourKit) can then show you changes in size and number of various objects after the system warm-up phase. are loaded, and then take two snapshots at different points in time.
When diagnosing a memory issue, it can be useful to start up the system, let it “warm-up” so that caches etc.It’s also interesting to check whether the memory graph is steeper when web traffic is higher, and less steep at off-peak times. Other shapes to consider include sawtooth and gradual slope. For example, a staircase graph may indicate that something is grabbing a lot of memory infrequently. Looking at graphs of memory usage can be really eye-opening, and can help to eliminate some theories, helping you to focus on what scenarios might match the actual shape of the graph.A series of overlapping threads, each of which consumes a chunk of memory.
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Much has been written on how to debug production memory leaks in Java, so rather than go into the nitty-gritty of how to comb through the heap, I thought I’d just highlight a couple of interesting points that came up as we were working on the issue… Note that this is based on an experience in which we had an issue in production that could not be replicated in test, so we had to start with a broad approach and then zero in on the cause… Musings from debugging a production memory leak…
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