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Updated macOS installer ReadMe.txt

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Bill Somerville 2020-11-20 21:28:12 +00:00
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Darwin/ReadMe.txt
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@ -16,7 +16,8 @@ Double-click on the wsjtx-...-Darwin.dmg file you have downloaded from K1JT's we
Now open a Terminal window by going to Applications->Utilities and clicking on Terminal.
Along with this ReadMe file there is a file: sysctl.conf which must be copied to a
system area by typing this line in the Terminal window and then pressing the Return key.
system area by typing these two lines in the Terminal window and then pressing the Return key
after each line.
sudo cp /Volumes/WSJT-X/sysctl.conf /etc
@ -28,7 +29,7 @@ change has been made by typing:
sysctl -a | grep sysv.shm
If shmmax is not shown as 14680064 then contact me since WSJT-X will fail to load with
If shmmax is not shown as 104857600 then contact me since WSJT-X will fail to load with
an error message: "Unable to create shared memory segment".
You can now close the Terminal window. It will not be necessary to repeat this procedure
@ -85,15 +86,8 @@ has to be increased. The sysctl.conf file is used for this purpose. You can
use a Mac editor to examine sysctl.conf. (Do not use another editor - the file
would be probably be corrupted.)
There are two important parameters that you need to consider. shmmax determines the
amount of shared memory that must be allocated for WSJT-X to operate. This is 14680064 (14MB)
and this is defined in the sysctl.conf file and should not be changed.
It is possible to run more than one instance of WSJT-X simultaneously. See
"Section 16.2 Frequently asked Questions" in the User Guide. The second important parameter
shmall=17920 determines how many instances are permitted. This is calculated as:
(shmall x 4096/14680064) = 5.
The sysctl.conf file is configured to permit up to 5 instances of wsjtx to run simultaneously.
If this limitation is acceptable then you can continue to install the sysctl.conf file without making any
alterations. Otherwise you must edit the file to increase shmall according to this calculation.
It is possible to run two instances of WSJT-X simultaneously. See "Section 16.2
Frequently asked Questions" in the User Guide. If you wish to run more than two instances
simutaneously, the sysctl.conf file needs to be modified. Please email me with your
requirements and I will provide a replacement sysctl.conf to suit.