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Instead of stopping the application threads during a full gc, cms uses one or more background threads to periodically scan through the old generation and discard unused objects. So what's the equivalent replacement for it The application has a heap of 8gb and creates a lot of short living objects I noticed that it often paused for some seconds to do garbage collection 10 i have a java service that currently runs with a 14gb heap I have configured the os as described by oracle using appropriate shared memory and page values (these can also be calculated with an online tool). Do you load many different classes dynamically Then you could maybe define a free ratio on the metaspace so that always enough space for new classes is available and no resizing will be needed in critical situations. Unfortunately (and in spite of the disclaimers in the documentation), many developers decide they know better than the jvm when to collect memory and introduce exactly this type of issue Checked on oracle jdk and openjdk java. *.h or *.hpp for your class definitions what is the difference between.cc and.cpp file suffix I used to think that it used to be that .h files are header files for c and c.