Update README.md

Update to describe the way to allocate more cpu cores to container
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@ -676,14 +676,16 @@ Or
#### Use more CPU Cores/SMP
By default container will get 4 cpu cores to run OS, you can allocate more cores by use environment variable `CPU_STRING='<smp_num>,cores=<core_num>'` or `SMP=<smp_num> CORES=<core_num>` when create container.
Examples:
`-e EXTRA='-smp 6,sockets=3,cores=2'`
`-e CPU_STRING='16,cores=16'`
`-e EXTRA='-smp 8,sockets=4,cores=2'`
or
`-e SMP=16 -e CORES=16`
`-e EXTRA='-smp 16,sockets=8,cores=2'`
Note, unlike memory, CPU usage is shared. so you can allocate all of your CPU's to the container.