On Fri, 12 Apr 2024 18:50:37 GMT, Alex Menkov <amen...@openjdk.org> wrote:
> > I am curious: what is the memory overhead for parallel mode, and (I am not > > familiar with the logic) how many threads are involved? Is the number of > > thread bounded? > > I ask because, especially for the OnOOM handling, we may already be at a > > limit memory-wise. Starting to swap will probably be worse than running > > single-threaded. > > Good question. It think it's several MB per each additional thread (1MB > output buffer, DumperClassCacheTable - 1031 elements max, element size > depends on class field numbers, if HeapDumpGzipLevel is set, some buffers for > gzip compressors) Number of threads by default is min of > `os::initial_active_processor_count() * 3 / 8` and number of GC workers. For the OOM case, I would probably make it somehow dependent on os::free_memory() then. ------------- PR Comment: https://git.openjdk.org/jdk/pull/18748#issuecomment-2053517286
