To find out the size of the RAM (random access memory) on a FreeBSD system, including the total amount of free and used memory, you can use the sysctl command. sysctl is a utility that allows you to view and modify various system parameters, including information about the system's memory.
To view the size of the RAM on a FreeBSD system, as well as the total amount of free and used memory, use the following sysctl command:
sysctl hw.physmem
This will display the size of the RAM in bytes. To display the size in a more readable format, such as megabytes or gigabytes, you can use the -b option followed by a scale factor. For example:
sysctl -b hw.physmem
This will display the size of the RAM in bytes. To display the size in megabytes, you can use a scale factor of 1048576, like this:
sysctl -b hw.physmem | awk '{print $1 / 1048576 " MB"}'
To display the size in gigabytes, you can use a scale factor of 1073741824, like this:
sysctl -b hw.physmem | awk '{print $1 / 1073741824 " GB"}'
To display the total amount of free and used memory on the system, you can use the following sysctl command:
sysctl vm.stats.vm.v_page_count
This will display the total number of pages of memory on the system, as well as the number of free, active, inactive, and wired pages. You can use the awk command to calculate the total amount of free and used memory in a more readable format, such as megabytes or gigabytes. For example:
sysctl vm.stats.vm.v_page_count | awk '{print "Total: " $1 * 4 " KB"}'
sysctl vm.stats.vm.v_free_count | awk '{print "Free: " $1 * 4 " KB"}'
sysctl vm.stats.vm.v_cache_count | awk '{print "Cache: " $1 * 4 " KB"}'
sysctl vm.stats.vm.v_inactive_count | awk '{print "Inactive: " $1 * 4 " KB"}'
sysctl vm.stats.vm.v_active_count | awk '{print "Active: " $1 * 4 " KB"}'
This will display the total amount of memory on the system, as well as the amount of free, cache, inactive, and active memory, in kilobytes. You can use a different scale factor to display the sizes in a different unit, such as megabytes or gigabytes.
For more information about using sysctl to view system information, you can refer to the sysctl man page by running man sysctl on the command line.