Measuring Computer Performance
A Practitioner's Guide

David J. Lilja
Cambridge University Press, New York, NY, 2000

ISBN 0-521-64105-5

Errata

The following corrections should be made to the book.

 

  1. p. 31 -- The example at the bottom of this page should be replaced with this file: p31-correction.pdf.
  2. p. 35 -- In the first sentence immediately following Equation (3.12), "w_{i} = 0.5" should be "w_{1} = 0.5."
  3. p. 53 -- In Equation (4.22), the term "z_(1-alpha/2)" should be replaced with the term "t_(1-alpha/2 ; n-1)." Then add the following sentence as the last sentence in this example, "Note that in Equation (4.22) we have replaced the z value in Equation (4.21) with the corresponding value from the t table since only n=8 measurements were used to compute the sample mean and the sample standard deviation."
  4. p. 54 -- The first paragraph should read, "A binomial distribution with parameters p and n has a mean of pn and a variance of p(1-p)n. If np >= 10, we can approximate the binomial distribution with a Gaussian distribution with mean p~n and variance p~(1-p~)n. Applying ..." (The notation p~ is supposed to be the letter p with a bar over the top.)
  5. p. 64 -- There is a small inconsistency between the explanation on p. 64 and Table 5.1 on p. 65. In the second sentence on p. 64, the difference values are computed as (di = ai - bi). However, in Table 5.1, the difference values are computed as (di = bi - ai). Either way is fine -- the order of subtraction changes only the sign of the difference (di) values. The final conclusion about the comparison will remain the same.
  6. p. 69 -- The last sentence of the first paragraph in Section 5.1.3 should read, "From the characteristics ... mean for system i is simply p_i n_i with a variance of p_i(1-p_i)n_i." (The notation p_i means the letter p with the subscript i.)
  7. p. 69 -- The first sentence of the second paragraph in Section 5.1.3 should read, "If both ... with mean p_i n_i and variance p_i(1-p_i)n_i."
  8. p. 70 -- Above Equation (5.21) the calculation for p should be, "p = p1 - p2 = 0.0250 ..."
  9. p. 70 -- Equations (5.22) and (5.23) show the calculation for a 95% confidence, not a 90% confidence interval as stated in the text above and below these equations.
  10. p. 72 -- The first summation in Equation (5.25) should be the sum from j=1 to k.
  11. p. 72 -- The entry y_kn in Table 5.3 should be y_nk.
  12. p. 77 -- In Table 5.6, the subscript for the F value from the table should have 0.95 in place of 0.05.
  13. p. 79 -- In Equation (5.52), the summation from j=1 to 3 should be omitted from the second radical.
  14. p. 91 -- In the next-to-last sentence of the second paragraph, "Thus, we have ... one tick while are measuring the event." should be "Thus, we have ... one tick while measuring the event."
  15. p. 101 -- In the first sentence of the second paragraph of Section 6.4.2.1, "interdeterminate" should be "indeterminate".
  16. p. 131 -- In the last paragraph of Section 7.3.3.1, "...for both TPC and UDP network..." should be "...for both TCP and UDP network..."
  17. p. 144 -- The denominator in Equation (8.32) should be "square root [7(86,611,800)]". The remainder of the expression is correct.
  18. p. 148 -- In Equation (8.41), "y" should be "y_i".
  19. p. 154 -- Near the end of the first paragraph, "t_1-0.95;4 = 2.132" should be "t_0.95;4 = 2.132".
  20. p. 154 -- In the last paragraph, y'_10 should be y_10 (that is, remove the prime mark).
  21. p. 163 -- In Equation (9.13), the last term, y_bar, should be added instead of subtracted.
  22. p. 164-165 -- In Equations (9.29), (9.30), and (9.31), the subscript for F on the right-hand side should have (1 - alpha) instead of alpha.
  23. p. 165 -- In Table 9.3, the subscripts for all of the F values from the table should have (1 - alpha) instead of alpha.
  24. p. 168 -- -- In Table 9.5, the subscript for the F values from the table should have 0.95 in place of 0.05.
  25. p. 169 -- In step #5, the subscript for F should have (1 - alpha) instead of alpha.
  26. p. 174 -- In Table 9.7, the subscripts for all of the F values from the table should have (1 - alpha) instead of alpha.
  27. p. 175 -- The sentence above Equation (9.62) should be, "For example, from Table 9.11, we find that the contrast for the interaction between factors A and C is ..."
  28. p. 211 -- In the third paragraph, the sentence that ends with, "... where n is the total of points plotted." should be "... where n is the total number of random values generated."
  29. p. 219 -- In Figure 11.2, the arrow pointing into the server of Disk 1 from the right-hand side should be removed. The arrow should be pointing out of this server.
  30. p. 230 -- Equation (11.16) should be P_0 = 1 / (rho^0 + rho^1 + rho^2 + ...) = 1 / sum(rho^n) where the summation still runs from n=0 to infinity.
  31. p. 243 -- In the last line on this page, the term "ln(1-p)" should be "ln(p)". This term should be corrected in both of the places it appears in this line.