I'm seeing a fairly significant performance regression between Julia Version 0.4.0-dev+5008 and Julia Version 0.4.0-dev+5712 ,and I don't know how to go about identifying what's wrong.
I'm timing betweenness_centrality in LightGraphs.jl. It used to be among the fastest implementations out there, but it's slipping. Here are some samples: for a 5k-node, 50k-vertex graph: 5008: 12.581 seconds (75506 k allocations: 5047 MB, 5.26% gc time) 5712: 19.291 seconds (75507 k allocations: 5047 MB) for a 10k-node, 100k-vertex graph: 5008: 91.238 seconds (380 M allocations: 27234 MB, 6.21% gc time) 5712: 100.042 seconds (380 M allocations: 27235 MB, 5.97% gc time) for the benchmark (a 39796-node, 301498-edge graph: 5008: 1238 seconds (3769 M allocations: 272 GB, 18.38% gc time) 5712: 1515 seconds (3769 M allocations: 272 GB, 16.63% gc time) Any ideas on how to figure out what's going on here? Profile shows the same lines in the same order (though for some reason 5712 is showing a lot more internal profiling).
