Adds a bench for hash_account()

[brooksprumo]

Problem

While tweaking the implementation for AccountsDb::hash_account_data(), I didn't have a way to benchmark my changes to see if there were any improvements.

Summary of Changes

Add a bench for hash_account().

Details

After running the benchmark, criterion displays useful information. Here's an example of the text results:

hash_account/data_size/0                                                                            
                        time:   [205.23 ns 205.41 ns 205.63 ns]
                        thrpt:  [375.66 MiB/s 376.07 MiB/s 376.39 MiB/s]
                 change:
                        time:   [+0.1869% +0.2886% +0.3974%] (p = 0.00 < 0.05)
                        thrpt:  [-0.3958% -0.2877% -0.1866%]
                        Change within noise threshold.
hash_account/data_size/165                                                                            
                        time:   [362.53 ns 362.56 ns 362.59 ns]
                        thrpt:  [647.02 MiB/s 647.07 MiB/s 647.12 MiB/s]
                 change:
                        time:   [-0.1588% -0.0725% -0.0067%] (p = 0.06 > 0.05)
                        thrpt:  [+0.0067% +0.0726% +0.1591%]
                        No change in performance detected.
hash_account/data_size/200                                                                            
                        time:   [434.96 ns 435.01 ns 435.07 ns]
                        thrpt:  [615.95 MiB/s 616.04 MiB/s 616.11 MiB/s]
                 change:
                        time:   [-0.0787% +0.0154% +0.0886%] (p = 0.74 > 0.05)
                        thrpt:  [-0.0885% -0.0154% +0.0787%]
                        No change in performance detected.
hash_account/data_size/1024                                                                             
                        time:   [1.4254 µs 1.4261 µs 1.4272 µs]
                        thrpt:  [738.39 MiB/s 738.94 MiB/s 739.29 MiB/s]
                 change:
                        time:   [-0.1822% -0.0684% +0.0270%] (p = 0.22 > 0.05)
                        thrpt:  [-0.0270% +0.0685% +0.1825%]
                        No change in performance detected.
hash_account/data_size/1048576                                                                            
                        time:   [270.04 µs 270.09 µs 270.13 µs]
                        thrpt:  [3.6154 GiB/s 3.6160 GiB/s 3.6166 GiB/s]
                 change:
                        time:   [-0.2249% -0.1810% -0.1467%] (p = 0.00 < 0.05)
                        thrpt:  [+0.1469% +0.1813% +0.2254%]
                        Change within noise threshold.
hash_account/data_size/10485760                                                                             
                        time:   [2.6661 ms 2.6673 ms 2.6685 ms]
                        thrpt:  [3.6596 GiB/s 3.6613 GiB/s 3.6629 GiB/s]
                 change:
                        time:   [+0.1661% +0.2227% +0.2755%] (p = 0.00 < 0.05)
                        thrpt:  [-0.2747% -0.2223% -0.1659%]
                        Change within noise threshold.

And here's two of the many webpages that gets produced.

[brooksprumo]

Since accounts in this size range make up ~90% of all accounts on mnb, we should optimize hashing for them. In order to quantify any improvements, we gotta benchmark it!

[jeffwashington]

lgtm

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.8%. Comparing base (3f9a7a5) to head (0bb8276).

Additional details and impacted files

@@            Coverage Diff            @@
##           master      #47     +/-   ##
=========================================
- Coverage    81.8%    81.8%   -0.1%     
=========================================
  Files         837      837             
  Lines      225922   225922             
=========================================
- Hits       184955   184888     -67     
- Misses      40967    41034     +67     

[HaoranYi]

lgtm!