> Interesting.  I can't replicate this on a stock ocaml toplevel.  It
> does occur, however, on a toplevel with vmthreads compiled in.

Ah, you should have said that earlier.  With vmthreads, input_value
and output_value go through an intermediate buffer which is a Caml string
(this is required because vmthreads must avoid blocking I/O system
calls, hence all I/O must be performed at the Caml level).  So, the
size of the data written by output_value or read by input_value is
limited by the maximal length of a Caml string.

This limitation of vmthreads isn't new in 3.08, it's been present from
the beginning.  

- Xavier Leroy

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