R help - Aug 2010 - Can saved R object .RData files be loaded by more than one R sessions for read only purpose?

Especially for large ff objects.

 

 

Xiaobo.Gu

 


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Yes, they are just a file that as many processes as you want to access
them; just be careful if you do update the file unless you are somehow
locking it.

On Sun, Aug 1, 2010 at 10:00 AM, ??? <guxiaobo1982 at gmail.com>
wrote:
> Especially for large ff objects.
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> Xiaobo.Gu
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?

Xiaobo.Gu,

Shared reading should be fine. 
Shared writing is also possible, but it is important to understand that .RData
files do only contain the meta-data of ff objects, not the ff data itself.

This means you cannot have multiple processes updating the same .RData metadata
but you can have multiple processes writing simultaneously to the same ff
datafile.

(it is your responsibility to avoid conflicts and to make sure you do not suffer
problems with delayed cache refreshs as can happen on network drives)

HTH

Jens Oehlschl?gel

Xiaobo.Gu,

Shared reading should be fine. 
Shared writing is also possible, but it is important to understand that .RData
files do only contain the meta-data of ff objects, not the ff data itself.

This means you cannot have multiple processes updating the same .RData metadata
but you can have multiple processes writing simultaneously to the same ff
datafile.

(it is your responsibility to avoid conflicts and to make sure you do not suffer
problems with delayed cache refreshs as can happen on network drives)

HTH

Jens Oehlschl?gel