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man page description for -c/--cpu-shares flag for docker run command

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Signed-off-by: Shishir Mahajan <shishir.mahajan@redhat.com>
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Shishir Mahajan 2015-02-18 14:01:55 -05:00
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docs/man/docker-run.1.md
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@ -88,6 +88,19 @@ the same proportion of CPU cycles, but you can tell the kernel to give more
shares of CPU time to one or more containers when you start them via **docker
run**.
The flag `-c` or `--cpu-shares` with value 0 indicates that the running
container has access to all 1024 (default) CPU shares. However, this value
can be modified to run a container with a different priority or different
proportion of CPU cycles.
E.g., If we start three {C0, C1, C2} containers with default values
(`-c` OR `--cpu-shares` = 0) and one {C3} with (`-c` or `--cpu-shares`=512)
then C0, C1, and C2 would have access to 100% CPU shares (1024) and C3 would
only have access to 50% CPU shares (512). In the context of a time-sliced OS
with time quantum set as 100 milliseconds, containers C0, C1, and C2 will run
for full-time quantum, and container C3 will run for half-time quantum i.e 50
milliseconds.
**--cap-add**=[]
Add Linux capabilities