Visualizing output from instrument:allocations()

Questions / Help
1

Is there a way to visualize the output from instrument:allocations()? Currently it outputs something like:

{ok,{128,5295896,
     #{asn1rt_nif =>
           #{binary => {19,2109,240,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
             drv_binary => {170,15,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}},
       crypto =>
           #{binary => {4775,2638,375,3,358,57,0,0,0,0,0,0,0,0,0,0,0,0},
             drv_binary => {3627,420,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}},
       prim_buffer =>
           #{binary => {0,92,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
             drv_binary => {0,0,2,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
             nif_internal => {0,92,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0}},
       prim_file =>
           #{binary => {95,118,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
             drv_binary =>
                 {51,0,11,28,56,31,23,11,13,11,0,0,0,0,0,0,0,0}},
       spawn => #{binary => {0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}},
       system =>
           #{binary =>
                 {4188,13933,770,1020,2069,62,2,0,2,0,0,0,0,0,0,0,0,0},
             driver => {0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
             driver_mutex => {3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
             driver_tsd => {2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
             drv_internal => {0,0,404,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
             microstate_accounting =>
                 {1,17,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
             nif_internal => {0,22,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
             port => {0,0,409,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
             port_data_lock => {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}},
       tcp_inet =>
           #{binary => {374,891,341,51,354,5,0,0,0,0,0,0,0,0,0,0,0,0},
             driver_tid => {2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
             driver_tsd => {1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
             drv_binary => {0,0,0,0,0,0,0,0,0,0,0,5,0,0,0,0,0,0},
             drv_internal => {397,8,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
             port => {0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}}}}}

I have two different machines where erlang:memory(system) is returning very different results although the machines should be more or less identical, and I want to know why, but these histograms doesn’t tell me anything.

2

Allocation tagging is only enabled for driver (NIFs fall under this category too) and binary allocators by default, so the chances are high that the difference you’re observing in erlang:memory(system) is not included in these results.

To get a more complete view of what allocations have been made, pass the emulator option +Muatags true to enable it for all allocator types.