Heapgraph sampling and visualization tooling
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Description
### HHVM Version
hhvm --version
HipHop VM 4.13.2 (rel)
hh_client --version
hackc-a6fd900a34a498abea492c9bcb9045ee5e9cb7f3-4.13.2
#### Heapgraph visualization and sampling
It would be great to have tooling that could sample a heapgraph and then output data and stacks that could be visualized in an icicle format, similar to an inverted flamegraph created by Xenon. I spoke with Kendall Hopkins and he suggested tooling and visualizations might exist.
https://github.com/facebook/hhvm/tree/master/hphp/runtime/ext/objprof
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