[MacRuby-devel] dtrace and macruby

[Jordan Breeding]

Scott,

I have not had any trouble running macruby through dtrace here, can you send the contents of your dtrace script so that I can compare to my working files?

Jordan

On Dec 18, 2009, at 16:33, Laurent Sansonetti wrote:

> Hi Scott,
> 
> I'm not a DTrace expert but in my experience, dtrace takes a short time to attach to a given process, and if the process exists prematurely it won't work. I'm not aware of any way to work around that, except by patching the process to make it wait a bit more, as you did.
> 
> This might be a good question for the DTrace list (if there is one!).
> 
> Laurent
> 
> On Dec 17, 2009, at 12:21 PM, Scott Thompson wrote:
> 
>> I'm trying to learn a bit more about dtrace and I thought that using it to add probes to macruby would be fun.
>> 
>> I pulled up the sample dtrace scripts from the Macruby 0.5 b2 source and was working with the script:
>> 
>> class World
>>  def say(message)
>>    puts message
>>  end
>> end
>> 
>> world = World.new
>> world.say('hello')
>> 
>> (taken from http://redartisan.com/2008/5/18/dtrace-ruby)
>> 
>> I tried to run the trace as:
>> 
>> $ sudo dtrace -s methods_count.d -c "macruby world.rb"
>> 
>> (where methods_count.d is one of the sample dtrace scripts)
>> 
>> This doesn't produce any meaningful results.
>> 
>> After playing around for a bit, I have learned that if I add a bit to the end of my ruby script:
>> 
>> while(true)
>> 	sleep 1
>> end
>> 
>> What I take from that is if the ruby script runs for a longer time, dtrace has a chance plugging into the ruby application which it does not have when the script exits quickly.
>> 
>> Am I doing something the wrong way?  Is there a better way to ask dtrace to attach to my ruby application and catch information?
>> 
>> Scott
>> 
>> _______________________________________________
>> MacRuby-devel mailing list
>> MacRuby-devel at lists.macosforge.org
>> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
> 
> _______________________________________________
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