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Updated macOS ReadMe.txt including how to disable App Nap for WSJT-X

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Thanks to John, G4KLA, for researching this and providing the updated
instructions.
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Bill Somerville 2021-07-16 14:31:21 +01:00
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Darwin/ReadMe.txt
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@ -6,7 +6,7 @@ you change the name in the Applications folder from WSJT-X to WSJT-X_previous
before proceeding.
I recommend that you follow the installation instructions especially if you
are moving from v2.2 to v2.3 or later, of WSJT-X or you have upgraded macOS.
are moving from v2.3 to v2.4 or later, of WSJT-X or you have upgraded macOS.
Double-click on the wsjtx-...-Darwin.dmg file you have downloaded from K1JT's web-site.
@ -25,7 +25,7 @@ change has been made by typing:
sysctl -a | grep sysv.shm
If shmmax is not shown as 52428800 then contact me since WSJT-X will fail to load with
If shmmax is not shown as 52428800 then contact me since WSJT-X might 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
@ -72,7 +72,9 @@ Please email me if you have problems.
--- John G4KLA (g4kla@rmnjmn.co.uk)
Addendum: Information about com.wsjtx.sysctl.plist and multiple instances of WSJT-X.
Additional Notes:
1. Information about com.wsjtx.sysctl.plist and multiple instances of WSJT-X
WSJT-X makes use of a block of memory which is shared between different parts of
the code. The normal allocation of shared memory on a Mac is insufficient and this
@ -87,7 +89,8 @@ simultaneously, the shmall parameter in the com.wsjtx.sysctl.plist file needs to
The shmall parameter determines the amount of shared memory which is allocated in 4096 byte pages
with 50MB (52428800) required for each instance. The shmall parameter is calculated as:
(n * 52428800)/4096 where 'n' is the number of instances required to run simultaneously.
Remember to reboot your Mac afterwards.
Replace your new version of this file in /Library/LaunchDaemons and remember to reboot your
Mac afterwards.
Note that the shmmax parameter remains unchanged. This is the maximum amount of shared memory that
any one instance is allowed to request from the total shared memory allocation and should not
@ -96,4 +99,15 @@ be changed.
If two instances of WSJT-X are running, it is likely that you might need additional
audio devices, from two rigs for example. Visit Audio MIDI Setup and create an Aggregate Device
which will allow you to specify more than one interface. I recommend you consult Apple's guide
on combining multiple audio interfaces which is at https://support.apple.com/en-us/HT202000.
on combining multiple audio interfaces which is at https://support.apple.com/en-us/HT202000.
2. Preventing WSJT-X from being put into 'sleep' mode (App Nap).
In normal circumstances an application which has not been directly accessed for a while can be
subject to App Nap which means it is suspended until such time as its windows are accessed. If
it is intended that WSJT-X should be submitting continued reports to, for example, PSK Reporter
then reporting will be interrupted. App Nap can be disabled as follows, but first quit WSJT-X:
Open a Terminal window and type: defaults write org.k1jt.wsjtx NSAppSleepDisable -bool YES
If you type: defaults read org.k1jt.wsjtx then the response will be: NSAppSleepDisable = 1;
Close the Terminal window and launch WSJT-X. (If you 'Hide' WSJT-X, this scheme will be suspended.)