[cageface]

Last I heard the Go compiler was generating code 6x or more slower than comparable C++ code. Is that not still true?

[enneff]

You heard wrong: http://blog.golang.org/2011/06/profiling-go-programs.html

[andrewcooke]

The graphviz / svg output from the profiler shown there is very nice. Does something similar exist for other languages? I particularly like the scaling of the node size by the appropriate value (CPU time, memory use, etc).

[enneff]

Go's pprof is based on the C-based one: http://code.google.com/p/gperftools/