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[doc] install: Update Determining Memory formula

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Jonathan Rubenstein 2021-05-04 05:31:38 -04:00 committed by Geoffrey McRae
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doc/install.rst
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@ -222,20 +222,17 @@ your desired maximum resolution using the following formula:
``width x height x 4 x 2 = total bytes``
``total bytes / 1024 / 1024 = total megabytes + 2``
``total bytes / 1024 / 1024 = total megabytes + 10``
For example, for a resolution of 1920x1080 (1080p)
``1920 x 1080 x 4 x 2 = 16,588,800 bytes``
``16,588,800 / 1024 / 1024 = 15.82 MB + 2 = 17.82``
``16,588,800 / 1024 / 1024 = 15.82 MB + 10 = 25.82``
You must round this value up to the nearest power of two, which with the
above example would be 32MB
Note: This formula may be out of date. A 1440p display requires 64mb
shared memory.
The shared memory file will be located in /dev/shm/looking-glass and
will need to be created on every boot otherwise it will have incorrect
permissions. Looking glass will not be able to run unless it has