How allowDiskUse is executed

From: Przemysław Wojnowski <cumego@xxxxxxxxx>
To: mongodb-user <mongodb-user@xxxxxxxxxxxxxxxx>
Date: Wed, 20 Apr 2016 06:27:27 -0700 (PDT)
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Hello,

In docs for "allowDiskUse" there is:
"Enables writing to temporary files. When set to true, aggregation stages 
can write data to the _tmp subdirectory in the dbPath 
<https://docs.mongodb.org/manual/reference/configuration-options/#storage.dbPath
directory."

Does it mean that setting the option to "true" will make pipeline stages to 
always use the disk or only when a stage exceeds 100MB limit?

Thanks!

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Why ads?