Hello!

I exported packed primitives with alembic rop and then rendered the alembic as vrmesh in vray/Maya and it took 0.7 gb of memory. If i render the alembic in Mantra it doesn't seem to understand the instancing and the render goes up to 42 gb. Does it not work in houdini or is it some parameter I'm missing.

Ill attach the scene here:

Yep, seems to be the case that mantra doesn't take advantage of the instancing in alembic. It consumes 33 GB for me when I render.

as far i know (i might be mistaken), the build in alembic doesnt support instancing. only the original - from alembic website support instancing.

AFAIK This should be fixed in tomorrow (16.5.344) build. More on bug reporting:
https://www.sidefx.com/forum/topic/25347/ [www.sidefx.com]

Nice! Will try that build and if it dont work I will make proper bugreport.