[MLton-devel] Effect of -exn-history true on performance

[Stephen Weeks]

> Can -exn-history true possibly have an effect on performance ?

Yes.  It can cause a significant slowdown.  IIRC, the benchmark it
affects the most is count-graphs, where it causes roughly 2X
slowdown. 

> I am not sure I understand how it is implemented. Thanks.

It is implemented by adding an extra field to exceptions, a string
list ref, and inserting code at every raise (and in particular at
every implicit reraise at every handle) to cons the source code
position onto the list.


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