Re: [Gems-users] checkpoints with ruby

[Alaa Alameldeen <alaa@xxxxxxxxxxx>]

Chris,

If you created the checkpoint with the ruby module loaded, you need to edit the 
checkpoint file manually to remove the ruby object from it. I think it is 
mentioned in a couple of places. The reason why loading the checkpoint fails is 
that Simics doesn't recognize the object ruby when it first starts.

-Alaa

Christian Bienia wrote:
> Hi,
>
> I created a checkpoint of a benchmark with only ruby loaded (no opal).
> However, when I quit Simics and try to read the configuration again, I
> get the following error:
>
>
>
> simics> read-configuration
> ../../checkpoints-u3/188.ammp/188.ammp-32-1b.ckp
> cannot open file: ./modules/ruby-v9.so
> Unexpected error when loading module 'ruby'
>
> cannot open file: ./modules/ruby-v9.so
> Unexpected error when loading module 'ruby'
>
> Class ruby not found.
> Error reading configuration file
> Failed reading configuration
> simics> 
>
>
>
> list-modules shows that ruby is there, and list-failed-modules doesn't
> show any errors. The confusing thing is that I can load checkpoints
> which I have created without ruby being loaded, and after that I can
> load and use ruby normally.
>
> To be a little bit more specific, I did exactly what Alaa explained in
> his post on Feb 15 about "fast forwarding module in Ruby/Opal":
>
>
>
> To get a cache warmup file:
> <...start from a checkpoint, do all required initialization...>
> load-module ruby
> ruby0.init
> <....run simics for the amount of time you want...>
> write-configuration <checkpoint_file_name>
> ruby0.save-caches <cache_file_name>
> quit
> Now to use that warmup file:
> read-configuration <checkpoint_file_name>
> <...do all required initialization...>
> load-module opal
> load-module ruby
> ruby0.init
> opal0.init
> ruby0.load-caches <cache_file_name>
> <...run your simulation...>
> <...print Ruby and/or Opal statistics...>
> quit
>
>
>
> The error happens after "read-configuration <checkpoint_file_name>". Does anybody know how I can fix that?
>
> Chris
>
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