Issue with building reference models with xPC target

Question

Chethan Pandarinath 2013-12-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/108681-issue-with-building-reference-models-with-xpc-target

回答： Chethan Pandarinath 2014-3-7

I have a model that requires concurrent execution (multiple processors) to run effectively. This means that the top-level model consists of several sub-blocks that are all model references (each referenced block can be assigned to a processor).

I am experiencing strange behavior during the build process. For one of these referenced models, I can compile it on its own and compilation will take < 3 minutes. However, if I build the top-level model, it always recompiles the referenced model, and this compilation can take upwards of 20 minutes.

I find it strange that the compilation on the referenced model (the sub-block) is being triggered even though I haven't modified the block at all. E.g. if the sub-block is 'B' and the top-level model is 'A', then I do

rtwbuild('B') rtwbuild('A')

The first build of B goes quickly. Even though the build of A is happening immediately afterwards, a recompile of B is triggered, and this process takes ~20 minutes. I see no reason why any of the model's dependencies should be modified in between the two commands...?

When the build of A gets to model B, the message I get is

### Checking the status of model reference RTW target for model 'B' used in 'A' ### Model reference RTW target (B.c) for model B is out of date because B.c does not exist.

Any thoughts on why this might be happening?

Best, Chethan

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Answer 1

Chethan Pandarinath 2014-3-7

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https://ww2.mathworks.cn/matlabcentral/answers/108681-issue-with-building-reference-models-with-xpc-target#answer_127464

Just for everyone's future reference, the solution to this problem was achieved in the following way:

In Model Configuration Parameters, under Code Generation, I ran "Check model..."

This made a couple specific recommendations, which I followed: Under "Check model configuration", it was recommended to turn on Signal storage reuse, and other sub-options. This was done. Under "Check for optimal bus virtuality", it recommended converting a couple buses to output as non-virtual. This was also followed.

After these adjustments, compile times dropped down from ~25 minutes to ~2.

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Answer 2

Rajiv Ghosh-Roy 2013-12-5

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https://ww2.mathworks.cn/matlabcentral/answers/108681-issue-with-building-reference-models-with-xpc-target#answer_117396

Just building model B is a different build format from building A (which in turn builds B). In the first case, you are building B for use as a standalone model. In the second case, A needs B to run, and this builds it differently. Hence the dependency build.

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Rajiv Ghosh-Roy 2013-12-6

I'm not sure why this is happening; your best bet would probably be to contact Support since you will be able to share your model. The builds "should" take roughly the same time. A wild guess would be that you are getting close to maxing out memory during the concurrent build.

Chethan Pandarinath 2013-12-13

Thanks Rajiv. Yeah, unfortunately it's not a memory issues (several gigs of memory free; the compile only takes <100MB). The CPU usage stays at 100% (on a single processor) throughout the compile.

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