[Mono-dev] Long execution time on first execution (in AOT case)

Martin Däumler mdae at cs.tu-chemnitz.de
Fri Aug 20 04:20:14 EDT 2010

Miguel de Icaza wrote:
> Hello,
>     I want to know how to make the execution of a code snippet/method
>     deterministic, i.e., like C code can be deterministic, not necessarily
>     "fast". That is, I tolerate a kind of "initialization" at startup time
>     of Mono, but the first execution must not take (much) more time than
>     following executions of the code snippet.
> A low-tech solution is to make sure you execute all the code paths that
> you will need before entering your deterministic phase.


I implemented pre-(JIT)-compilation of (nearly) all possibly called
methods (including mscorlib) by using the original Mono JIT compiler,
that is by calling "mono_compile_method()" for each method. Secondly, I
want to execute all emitted trampolines in advance. So far, the code
works. However, I guess having a race condition. The pre-compilation of
the assemblies and the pre-execution of the trampolines takes place in
method "main_thread_handler()", driver.c, right before calling

How can I protect the compiled code? Using the Loader Lock and the
Domain Lock do not work. Would the JIT Lock work and how can I make
it available in "main_thread_handler()"?

With kind regards,
Martin Däumler

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