[GitHub] nickva commented on issue #505: Enable tail call optimization in couch_replicator_docs

[git]

nickva commented on issue #505: Enable tail call optimization in 
couch_replicator_docs
URL: https://github.com/apache/couchdb/pull/505#issuecomment-299054310
 
 
   @davisp pointed out that current code already has TCO and this is not needed
   
   Used this script from him (with a modification to just print the memory of 
the process) to verify:
   
   ```
   -module(foo).
   -compile(export_all).
   a() ->
       a(0).
   a(I) ->
       if (I+1) rem 1000 /= 0 -> ok; true ->
           io:format("~p~n", [process_info(self(), memory)])
       end,
       try
           throw(bar)
       catch throw:bar ->
           c(a, I+1)
       end.
   b() ->
       b(0).
   b(I) ->
       if (I+1) rem 1000 /= 0 -> ok; true ->
           io:format("~p~n", [process_info(self(), memory)])
       end,
       try
           c(b, I+1)
       catch throw:bar ->
           foo
       end.
   c(F, I) ->
       ?MODULE:F(I).
   ```
   
   foo:b() ends up producing
   
   ```
   ...
   {memory,102684144}
   {memory,102684144}
   {memory,102684144}
   {memory,102684144}
   ```
   
   foo:a() is stable 
   ```
   ...
   {memory,16672}
   {memory,24576}
   {memory,11784}
   {memory,16672}
   ```
   
 
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