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VM does not return memory to OS #25178

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scheglov opened this issue Dec 8, 2015 · 4 comments
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VM does not return memory to OS #25178

scheglov opened this issue Dec 8, 2015 · 4 comments
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area-vm Use area-vm for VM related issues, including code coverage, and the AOT and JIT backends.

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@scheglov
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scheglov commented Dec 8, 2015

  • Start IntelliJ

  • Import the whole SDK repo as a project

  • Open Observatory, notice that VM uses 2.5 GB of heap

  • Close the SDK project.

  • Switch back to Observatory, open Heap Allocation, to GC

  • The memory usage dropped to 238 MB, the allocated heap is still 2.4 GB.

    Why?

image
@scheglov scheglov added the area-vm Use area-vm for VM related issues, including code coverage, and the AOT and JIT backends. label Dec 8, 2015
@scheglov scheglov mentioned this issue Dec 8, 2015
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@scheglov
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scheglov commented Dec 8, 2015

@alexander-doroshko

@azenla
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azenla commented Jan 6, 2016

Is this related to #24938?

@scheglov
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scheglov commented Jan 6, 2016

Yes, it seems so.

@alexander-doroshko alexander-doroshko mentioned this issue Jan 27, 2016
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@rmacnak-google
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The VM returns memory to the OS when every object on a page if no longer reachable. If the fraction of old space that is used is low, it is likely fragmentation.

#30978

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