[LNT][Patch] Bug 16261 - lnt incorrectly builds timeit-target when one is using a simulator

[reed kotler]

Hi Daniel,

In this case we are not using lnt under Qemu user mode for benchmarking; 
just as a way to run test-suite to test whether the code is correct.

Qemu user mode emulates target instructions, but when it gets a Unix 
Kernel trap, it uses the host to emulate those.

For example, file I/O.

It is possible to run target timeit under qemu and let it launch the app 
or a wrapper.
(But it is more limited as to what can be done here under qemu vs under 
the host OS directly).

For time functions, it is also going to use the host to emulate those.

So whether timeit is running under qemu or directly on the host, the 
answers regarding time will be the same.

But running timeit under qemu will be much slower as far as elapsed time 
than running it on the host directly.

We would also need to add some new mechanism to Lnt or the makefiles to 
also wrap timeit.

Reed


On 07/23/2013 02:19 PM, Daniel Dunbar wrote:
> Wouldn't it be a more accurate simulation to run timeit-target under 
> the emulator as well? Or is that too much to ask?
>
>  - Daniel
>
>
> On Mon, Jul 22, 2013 at 6:47 PM, Reed Kotler <rkotler at mips.com 
> <mailto:rkotler at mips.com>> wrote:
>
>
>
>     Just to clarify:
>
>     this is when tests are run under USER mode qemu.
>
>
>     On 07/22/2013 04:09 PM, Doug Gilmore wrote:
>
>         I attached a patch to lnt that addresses this issue.
>
>         The patch adds the --host-compile-tools option, which when
>         specified,
>         forces compilation of the tools for execution on the host.
>
>         This allows lnt to be used for correctness testing when the tests
>         are run under QEMU.
>
>         Comments?
>
>         Doug
>
>
>
>
>
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