The errata list is a list of errors and their corrections that were found after the product was released.
The following errata were submitted by our customers and have not yet been approved or disproved by the author or editor. They solely represent the opinion of the customer.
Color Key: Serious technical mistake Minor technical mistake Language or formatting error Typo Question Note Update
| Version |
Location |
Description |
Submitted by |
Date submitted |
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Chapter 48. Delays and Throughput
4th paragraph |
Wow! This book is insanley great! Great writing as well. I am learning so much and enjoying every page!
But I believe there is a typo in chapter 48 regarding the amount of communication channels required by a system with n=20 processes:
"Imagine that you have ten processes that must all communicate with each other to maintain cache coherency. Then there are 9 + 8 + 7 + … + 1 = 45 communication channels that the system must maintain. If the number of processes increases just by 1, to 11, then the communication channel count increases by 10, to 55. Doubling the process count from 10 to 20 increases the communication channel count from 55 to 210."
A system with 20 processes requires communication channels/lines to 19 other processes.
(19*19 + 19) / 2 = 190
Thus, a system with 20 processes requires 190 communication channels but not 210. The 210 count number would include a channel from and to the 20th process itself.
Is my assumption correct?
Thanks for this book!
|
Wolfgang Kaufmann |
Sep 04, 2023 |
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Chapter 98. Capacity Planning.
last bullet item (the one before the 2nd paragraph from the bottom of the page) |
"Cells F11 and F14 give you helpful advice, in an effort to try to keep you away from the far right of the hockey stick curve that shows you how bad queueing delay can get if you overdo your traffic intensity."
There are no cells F11 to F14 depicted within the provided screenshot. Column E contains the "% capacity" values. Thus, I assume it should be corrected to: "E11 to E14".
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Wolfgang Kaufmann |
Sep 14, 2023 |