SDD vs HDD

root@laptop:~# ~/Downloads/seeker /dev/sda
Seeker v2.0, 2007-01-15, http://www.linuxinsight.com/how_fast_is_your_disk.html
Benchmarking /dev/sda [171705MB], wait 30 seconds..............................
Results: 3121 seeks/second, 0.32 ms random access time

root@laptop:~# ~/Downloads/seeker /dev/sda
Seeker v2.0, 2007-01-15, http://www.linuxinsight.com/how_fast_is_your_disk.html
Benchmarking /dev/sda [171705MB], wait 30 seconds..............................
Results: 3294 seeks/second, 0.30 ms random access time

insider@laptop:~/Downloads/testio$ sysbench --test=fileio --file-num=64 --file-total-size=8G --init-rng=on --file-extra-flags=direct prepare
sysbench 0.4.12:  multi-threaded system evaluation benchmark

64 files, 131072Kb each, 8192Mb total
Creating files for the test...

insider@laptop:~/Downloads/testio$ sysbench --test=fileio --file-total-size=8G --file-test-mode=rndrd --max-time=60 --max-requests=100000000 --num-threads=4 --init-rng=on --file-num=64 --file-extra-flags=direct --file-fsync-freq=0 --file-block-size=16384 run
sysbench 0.4.12:  multi-threaded system evaluation benchmark

Running the test with following options:
Number of threads: 4
Initializing random number generator from timer.


Extra file open flags: 16384
64 files, 128Mb each
8Gb total file size
Block size 16Kb
Number of random requests for random IO: 100000000
Read/Write ratio for combined random IO test: 1.50
Calling fsync() at the end of test, Enabled.
Using synchronous I/O mode
Doing random read test
Threads started!
Time limit exceeded, exiting...
(last message repeated 3 times)
Done.

Operations performed:  523780 Read, 0 Write, 0 Other = 523780 Total
Read 7.9922Gb  Written 0b  Total transferred 7.9922Gb  (136.4Mb/sec)
 8729.61 Requests/sec executed

Test execution summary:
    total time:                          60.0004s
    total number of events:              523780
    total time taken by event execution: 237.9509
    per-request statistics:
         min:                                  0.16ms
         avg:                                  0.45ms
         max:                                161.92ms
         approx.  95 percentile:               0.57ms

Threads fairness:
    events (avg/stddev):           130945.0000/99.50
    execution time (avg/stddev):   59.4877/0.00

----- 4 threads

4k blocks
10894.63 Requests/sec executed

8k blocks
9747.20 Requests/sec executed

128k blocks
1876.51 Requests/sec executed


----- 16 threads

4k blocks
32684.49 Requests/sec executed

8k blocks
19912.04 Requests/sec executed


----- 64 threads

4k blocks
34380.02 Requests/sec


----------------------------------------------------------------------- HDD

root@laptop:~# ~/Downloads/seeker /dev/sdb
Seeker v2.0, 2007-01-15, http://www.linuxinsight.com/how_fast_is_your_disk.html
Benchmarking /dev/sdb [476940MB], wait 30 seconds.............................
Results: 59 seeks/second, 16.73 ms random access time

root@laptop:~# ~/Downloads/seeker /dev/sdb
Seeker v2.0, 2007-01-15, http://www.linuxinsight.com/how_fast_is_your_disk.html
Benchmarking /dev/sdb [476940MB], wait 30 seconds..............................
Results: 66 seeks/second, 15.14 ms random access time


----- 4 threads
4k blocks
208.23 Requests/sec executed

8k blocks
206.32 Requests/sec executed

16k blocks
201.86 Requests/sec executed


----- 16 threads
4k blocks
282.43 Requests/sec executed

8k blocks
282.41 Requests/sec executed

16k blocks
271.26 Requests/sec executed


----- 64 threads
4k blocks
280.98 Requests/sec executed

8k blocks
278.67 Requests/sec executed

16k blocks
272.02 Requests/sec executed


----- 128 threads
4k blocks
252.71 Requests/sec executed