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worker waiting???
3 posts by 2 authors  



digxx 	

Apr 16


When accessing a SharedArray do the other workers wait when at one moment in time a specific worker is changing some entry another worker would like to access to too?
for example
power=SharedArray(Int64,10)
@parallel for i=1,100

if power(1)==0
power(1) = something
end

end
 


digxx 	

Apr 16


Sry, I accidentally sent my post.
So the above version seems to run berserker
if i put an @sync infront of @parallel it seems to work, but does it really?
 


Yichao Yu 	

Apr 16

Re: [julia-users] Re: worker waiting???

- show quoted text -
It's not vary clear from your code above what you want to do although 
there's a few things that I can say, 

1. I don't think SharedArray have any automatic 
locking/synchronization scheme (since it will be very expensive). 
2. You need @sync in front @parallel is necessary if you want to wait 
for the loop to finish. This is documented in the doc for parallel and 
sync.