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Added compute/stats-for-sysadmins.md

Dave committed 2020-04-20 23:23:40 +0000 commit 8e5da70341fd55b6c1e519d9637f53e142cafb9d

				compute/stats-for-sysadmins.md
			
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          +<!-- TITLE: Stats For Sysadmins -->

          +<!-- SUBTITLE: Finger in the air shit right here -->

          +

          +### 1/n chance tried n times

          +From https://theartofmachinery.com/2020/01/27/systems_programming_probability.html

          +For n>3, there's a bit less than a 2/3 chance of at least one hit.

          +

          +### n balls in n buckets

          +From https://theartofmachinery.com/2020/01/27/systems_programming_probability.html

          +If you throw n balls into n buckets at random, a bit over a third of the buckets will be empty, a bit over a third will have one ball, and the remaining quarter or so will have multiple balls.

          +

          +### Scale up, or scale out?

          +From http://people.brunel.ac.uk/~mastjjb/jeb/or/queue.html

          +If you only care about throughput, scale up.

          +If you care about wait times, scale out.

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	1	+<!-- TITLE: Stats For Sysadmins -->
	2	+<!-- SUBTITLE: Finger in the air shit right here -->
	3	+
	4	+### 1/n chance tried n times
	5	+From https://theartofmachinery.com/2020/01/27/systems_programming_probability.html
	6	+For n>3, there's a bit less than a 2/3 chance of at least one hit.
	7	+
	8	+### n balls in n buckets
	9	+From https://theartofmachinery.com/2020/01/27/systems_programming_probability.html
	10	+If you throw n balls into n buckets at random, a bit over a third of the buckets will be empty, a bit over a third will have one ball, and the remaining quarter or so will have multiple balls.
	11	+
	12	+### Scale up, or scale out?
	13	+From http://people.brunel.ac.uk/~mastjjb/jeb/or/queue.html
	14	+If you only care about throughput, scale up.
	15	+If you care about wait times, scale out.
...	...	\ No newline at end of file