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WSJT-X
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Switch to using a launchd plist for macOS shared memory config 

Tnx to Steve, W1SEG, and John, G4KLA.
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Bill Somerville 2021-03-06 18:20:27 +00:00
parent ec61291cb0
commit c080a9ae40
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4 changed files with 28 additions and 43 deletions
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2
CMakeLists.txt
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@ -1599,7 +1599,7 @@ install (DIRECTORY
if (APPLE)
install (FILES
Darwin/ReadMe.txt
Darwin/sysctl.conf
Darwin/com.wsjtx.sysctl.plist
DESTINATION .
#COMPONENT runtime
)

46
Darwin/ReadMe.txt
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@ -1,42 +1,21 @@
Notes on WSJT-X Installation for Mac OS X
-----------------------------------------
Important: If you are using the new Mac with the M1 chip then please read
the section marked: BEGIN M1. Otherwise BEGIN INTEL applies.
If you have already downloaded a previous version of WSJT-X then I suggest
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 of WSJT-X or you have upgraded macOS.
BEGIN M1:
are moving from v2.2 to v2.3 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.
Now open a Terminal window by going to Applications->Utilities and clicking on Terminal.
There are two system variables that must be set manually since the M1 Macs do not recognise
automatic parameter settings by means of the sysctl.conf file present in the download.
Type these commands - you will be asked for your password which will not be echoed:
sudo sysctl -w kern.sysv.shmmax=52428800
sudo sysctl -w kern.sysv.shmall=25600
It is important to note that these parameter settings will not survive a reboot. If you
need to reboot your Mac, then these commands must be re-entered. Now proceed to NEXT.
BEGIN INTEL:
Double-click on the wsjtx-...-Darwin.dmg file you have downloaded from K1JT's web-site.
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
Along with this ReadMe file there is a file: com.wsjtx.sysctl.plist which must be copied to a
system area by typing this line in the Terminal window and then pressing the Return key.
sudo cp /Volumes/WSJT-X/sysctl.conf /etc
sudo cp /Volumes/WSJT-X/com.wsjtx.sysctl.plist /Library/LaunchDaemons
you will be asked for your normal password because authorisation is needed to copy this file.
(Your password will not be echoed but press the Return key when completed.)
@ -53,8 +32,6 @@ You can now close the Terminal window. It will not be necessary to repeat this
again, even when you download an updated version of WSJT-X. It might be necessary if you
upgrade macOS.
NEXT:
Drag the WSJT-X app to your preferred location, such as Applications.
You need to configure your sound card. Visit Applications > Utilities > Audio MIDI
@ -95,27 +72,22 @@ Please email me if you have problems.
--- John G4KLA (g4kla@rmnjmn.co.uk)
Addendum: Information about sysctl.conf and multiple instances of WSJT-X.
Addendum: 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
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
has to be increased. The com.wsjtx.sysctl.plist file is used for this purpose. You can
use a Mac editor to examine the file. (Do not use another editor - the file
would probably be corrupted.)
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
simultaneously, the shmall parameter in the sysctl.conf file needs to be modified as follows.
simultaneously, the shmall parameter in the com.wsjtx.sysctl.plist file needs to be modified as follows.
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. If
you are using an Intel Mac, modify the shmall parameter in the sysctl.conf file using a Mac editor
and then install in the /etc directory using the installation procedure described above for an
Intel Mac. Remember to reboot your Mac afterwards.
If you are using an M1 Mac, then simply issue the sudo sysctl -w kern.sysv.shmall=xxx command where
xxx is the new value of shmall that is required.
(n * 52428800)/4096 where 'n' is the number of instances required to run simultaneously.
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

18
Darwin/com.wsjtx.sysctl.plist Normal file
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@ -0,0 +1,18 @@
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
<string>com.wsjtx.sysctl</string>
<key>Program</key>
<string>/usr/sbin/sysctl</string>
<key>ProgramArguments</key>
<array>
<string>/usr/sbin/sysctl</string>
<string>kern.sysv.shmmax=52428800</string>
<string>kern.sysv.shmall=25600</string>
</array>
<key>RunAtLoad</key>
<true/>
</dict>
</plist>

5
Darwin/sysctl.conf
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@ -1,5 +0,0 @@
kern.sysv.shmmax=52428800
kern.sysv.shmmin=1
kern.sysv.shmmni=128
kern.sysv.shmseg=32
kern.sysv.shmall=25600