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Merge pull request #1668 from zestysoft/Memory-Map-FAQ-Additional-Details 

Add additional details to increasing mapped memory.
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Kyle Johnson 2016-11-04 11:24:15 -06:00 committed by GitHub
parent ad898d6ffe b813b51f2b
commit ae1abe99ab
1 changed files with 5 additions and 11 deletions
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docs/faq.rst
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@ -96,22 +96,16 @@ A sample output on Ubuntu:
:: ::
pp@camerapc:~$ df -h pp@camerapc:~$ df -h|grep "Filesystem\|shm"
Filesystem Size Used Avail Use% Mounted on Filesystem Size Used Avail Use% Mounted on
/dev/sda1 226G 96G 119G 45% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
udev 1.8G 4.0K 1.8G 1% /dev
tmpfs 371M 816K 370M 1% /run
none 5.0M 0 5.0M 0% /run/lock
tmpfs 2.6G 923M 1.7G 36% /run/shm tmpfs 2.6G 923M 1.7G 36% /run/shm
none 100M 0 100M 0% /run/user
The key item here is tmpfs --> the example above shows we have allocated 1.7G of mapped memory space of which 36% is used which is a healthy number. If you are seeing this to go beyond 70% you should probaby increase mapped memory The key item here is tmpfs --> the example above shows we have allocated 1.7G of mapped memory space of which 36% is used which is a healthy number. If you are seeing ``Use%`` going beyond 70% you should probaby increase the mapped memory.
For example, if you want to increase this limit to 70% of your memory, add the following to ``/etc/fstab``
If you want to increase this limit to 70% of your memory, add the following to ``/etc/fstab`` ``tmpfs SHMPATH tmpfs defaults,noexec,nosuid,size=70% 0 0``
``tmpfs /run/shm tmpfs defaults,noexec,nosuid,size=70% 0 0`` where SHMPATH is the ``Mounted on`` path. Here, that would be ``/run/shm``. Other systems may be ``/dev/shm``.
What does a 'Can't shmget: Invalid argument' error in my logs mean? (and my camera does not display at higher resolutions) What does a 'Can't shmget: Invalid argument' error in my logs mean? (and my camera does not display at higher resolutions)