FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.
| --- | |
| - hosts: dbservers | |
| gather_facts: true # default | |
| # don't do anything here, just want to populate all the facts about the dbservers | |
| - hosts: webservers | |
| tasks: | |
| - name: do something with a db server fact | |
| debug: var=hostvars[db_server] |
| --------------------------------------------------------------------- | |
| | The CASC (Content Addressable Storage Container) Filesystem | | |
| | Warlords of Draenor Alpha, Build 6.0.1.18125 | | |
| | Written April 14th, 2014 by Caali | | |
| | Version 1.2 | | |
| --------------------------------------------------------------------- | |
| Distribution and reproduction of this specification are allowed without | |
| limitation, as long as it is not altered. Quotation in other works is | |
| freely allowed, as long as the source and author of the quote are stated. |
L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns
Compress 1K bytes with Zippy ............. 3,000 ns = 3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns = 20 µs
SSD random read ........................ 150,000 ns = 150 µs
Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs