Merge pull request #392 from pythonspeed/390-workaround

Workaround for slow flamegraph rendering

Author: itamarst

.changelog/390.bugfix

@@ -0,0 +1 @@
+Speed up rendering of flamegraphs in cases where there are many smaller allocations, by filtering out allocations smaller than 0.2% of total memory. Future releases may re-enable showing smaller allocations if a better fix can be found.

memapi/src/flamegraph.rs

@@ -135,6 +135,7 @@ pub fn get_flamegraph<I: IntoIterator<Item = String>>(
     options.reverse_stack_order = reversed;
     options.color_diffusion = true;
     options.direction = flamegraph::Direction::Inverted;
+    options.min_width = 0.2;
     // Maybe disable this some day; but for now it makes debugging much
     // easier:
     options.pretty_xml = true;