[ubuntu] Increasing the size of the swap partition

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http://ubuntuforums.org – Hi, I have a code that uses a lot of memory (over 50 GB) and my RAM (16 GB) and current swap space (32 GB) are not enough. Is there way to increase the swap partition size without having to reformat the drive? I also heard you can use swap files (I have no idea how to do that), and can you have huge swap file >20 GB ? Thanks in advance (Hardware)