Re: GPS Mac OS challenges

[Marc Rosen]

( next looking for an open spot to get a GPS signal)

Persisting shared memory limits on OS X 12 Monterey

add a text file “plist" to /Library/LaunchDaemons  

the file name is immaterial - I found a useful file and edited it to my needs

the text file plist is very sensistive - beware of spaces in value strings and misspellings

sudo launchctl load com.wsjtx.sysctl.plist 

sudo launchctl unload com.wsjtx.sysctl.plist 

the text of the file I used ultimately is:

<?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>

<string>kern.sysv.shmmni=128</string>

<string>kern.sysv.shmseg=32</string>

    </array>

    <key>RunAtLoad</key>

    <true/>

</dict>

</plist>

Marc

On Dec 9, 2021, at 2:20 PM, Gary E. Miller <gem@rellim.com> wrote:

Yo Marc!

On Thu, 9 Dec 2021 18:16:38 -0600
Marc Rosen <marc.rosen@mac.com> wrote:

One improvement - after rereading the instructions I realized that

the magic numbers for user space gpsd are 2 and 3, I changed those in

the ntpd.conf and the permission issue went away ( ntpshmmon)

But did you get any data from gpsd to ntpd on SHM(2)?  Forget SHM(3), you
do not have any PPS.

I don’t have great visibility to the GPS sky right now

Putting you antenna next to a south facing window can help.

- here’s the last debug:

Nothing new there.


RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
   gem@rellim.com  Tel:+1 541 382 8588

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