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Update Mac ReadMe and shared memory sysctl.conf files

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Thanks to John, G4KLA, for this contribution.

Allows for  up to five  concurrent WSJT-X instances  with instructions
for using more.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7923 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Bill Somerville 2017-07-17 16:25:13 +00:00
parent d6a9a76bcf
commit 4f0a3780e5
2 changed files with 19 additions and 8 deletions
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22
Darwin/ReadMe.txt
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@ -1,6 +1,9 @@
Notes on WSJT-X Installation for Mac OS X
-----------------------------------------
Updated 16 July 2017
--------------------
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.
@ -17,13 +20,20 @@ Along with this ReadMe file there is a file: sysctl.conf. Drag this file to
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. You can check the current allocation on your Mac by typing:
has to be increased. You should use a Mac editor to examine sysctl.conf.
sysctl -a | grep sysv.shm
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 14. Platform Dependencies" 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.
If your shmmax is already at least 33554432 (32 MB) then you can close the Terminal
window and skip the next steps and go to (NEXT).
Now move this file into place for the system to use by typing: (Note this assumes that
you really did drag this file to your Desktop as required earlier.)
@ -37,7 +47,7 @@ change has been made by typing:
sysctl -a | grep sysv.shm
If shmmax is not shown as 33554432 then contact me since WSJT-X will fail to load with
If shmmax is not shown as 14680064 then contact me since WSJT-X will fail to load with
an error message: "Unable to create shared memory segment".
You are now finished with system changes. You should make certain that NO error messages

5
Darwin/sysctl.conf
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@ -1,5 +1,6 @@
kern.sysv.shmmax=33554432
kern.sysv.shmmax=14680064
kern.sysv.shmmin=1
kern.sysv.shmmni=128
kern.sysv.shmseg=32
kern.sysv.shmall=8192
kern.sysv.shmall=17920