It was some time ago, but I was toying with an encoder/decoder for the "Transit" format (of Clojure/Cognitect fame). That decoder used monads heavily as well, and flambda provided roughly an order of magnitude speedup (and a lower GC pressure as well in addition). It was enough that I made a mental note of using flambda if this ever went into a system with high throughput requirements.

On Tue, Sep 19, 2017 at 2:47 PM Helmut Brandl <helmut.brandl@gmx.net> wrote:
Thanks for the hint

Helmut
> On Sep 18, 2017, at 10:31, Yotam Barnoy <yotambarnoy@gmail.com> wrote:
>
> You might find this
> (https://discuss.ocaml.org/t/ann-monads-the-missing-monad-transformers-library/830/8)
> discussion relevant.
>
> On Mon, Sep 18, 2017 at 11:23 AM, Helmut Brandl <helmut.brandl@gmx.net> wrote:
>> I want to restructure my project using monads (reader, state, option, etc.) in order to get cleaner code.
>>
>> Is there any performance penalty to pay. From my understanding there shouldn’t be any or only very little since aggressive inlining should be able to compile the monads away.
>>
>> Is there any experience on how the optimizing ocaml compiler is able to optimize monadic code?
>>
>> Regards
>> Helmut
>>
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