A simple sequential IO test with different buffer sizes.
To run:
javac src/main/java/IOTest.javajava -cp src/main/java IOTest
Output looks like this:
Starting sequential write test... Writing 60 MB with bufferSize: 1 KB Elapsed: 0.00 sec; 0.00 MB written ; Infinity secs to go; 0.00 MB/sec ; 4,420,369.06 IOPS Elapsed: 0.14 sec; 1.07 MB written ; 7.66 secs to go; 7.69 MB/sec ; 8,234.93 IOPS ... Elapsed: 3.60 sec; 60.00 MB written ; 0.00 secs to go; 16.67 MB/sec ; 23,503.17 IOPS Writing 120 MB with bufferSize: 2 KB Elapsed: 0.00 sec; 0.00 MB written ; Infinity secs to go; 0.00 MB/sec ; 6,797,264.78 IOPS Elapsed: 0.04 sec; 1.95 MB written ; 2.68 secs to go; 43.98 MB/sec ; 22,844.05 IOPS Elapsed: 3.04 sec; 120.00 MB written ; 0.00 secs to go; 39.43 MB/sec ; 43,280.20 IOPS Writing 180 MB with bufferSize: 4 KB Elapsed: 0.00 sec; 0.00 MB written ; Infinity secs to go; 0.00 MB/sec ; 8,956,204.16 IOPS Elapsed: 0.04 sec; 3.52 MB written ; 2.21 secs to go; 79.83 MB/sec ; 20,545.69 IOPS ... Elapsed: 2.73 sec; 180.00 MB written ; 0.00 secs to go; 65.96 MB/sec ; 96,468.48 IOPS Writing 240 MB with bufferSize: 8 KB Elapsed: 0.00 sec; 0.00 MB written ; Infinity secs to go; 0.00 MB/sec ; 9,011,140.02 IOPS Elapsed: 0.04 sec; 6.25 MB written ; 1.50 secs to go; 156.20 MB/sec ; 20,072.89 IOPS ... Elapsed: 1.73 sec; 239.99 MB written ; 0.00 secs to go; 139.01 MB/sec ; 34,647.47 IOPS Writing 300 MB with bufferSize: 16 KB Elapsed: 0.00 sec; 0.00 MB written ; Infinity secs to go; 0.00 MB/sec ; 7,789,028.60 IOPS Elapsed: 0.05 sec; 10.94 MB written ; 1.22 secs to go; 237.56 MB/sec ; 15,272.24 IOPS ... Elapsed: 1.36 sec; 299.98 MB written ; 0.00 secs to go; 220.42 MB/sec ; 35,201.67 IOPS Writing 360 MB with bufferSize: 32 KB Elapsed: 0.00 sec; 0.00 MB written ; Infinity secs to go; 0.00 MB/sec ; 5,752,416.01 IOPS Elapsed: 0.05 sec; 18.75 MB written ; 0.98 secs to go; 349.51 MB/sec ; 11,230.89 IOPS ... Elapsed: 1.15 sec; 359.97 MB written ; 0.00 secs to go; 312.09 MB/sec ; 35,887.09 IOPS Writing 420 MB with bufferSize: 64 KB Elapsed: 0.00 sec; 0.00 MB written ; Infinity secs to go; 0.00 MB/sec ; 1,946,850.97 IOPS ... Elapsed: 0.95 sec; 419.94 MB written ; 0.00 secs to go; 442.14 MB/sec ; 16,424.65 IOPS Writing 480 MB with bufferSize: 128 KB Elapsed: 0.00 sec; 0.00 MB written ; Infinity secs to go; 0.00 MB/sec ; 1,770,663.64 IOPS Elapsed: 0.08 sec; 50.00 MB written ; 0.73 secs to go; 592.46 MB/sec ; 4,760.71 IOPS ... Elapsed: 0.73 sec; 479.88 MB written ; 0.00 secs to go; 655.77 MB/sec ; 7,217.09 IOPS Writing 540 MB with bufferSize: 256 KB Elapsed: 0.00 sec; 0.00 MB written ; Infinity secs to go; 0.00 MB/sec ; 702,332.68 IOPS ... Elapsed: 0.78 sec; 539.75 MB written ; 0.00 secs to go; 689.58 MB/sec ; 11,871.25 IOPS Writing 600 MB with bufferSize: 512 KB Elapsed: 0.00 sec; 0.00 MB written ; Infinity secs to go; 0.00 MB/sec ; 120,917.67 IOPS ... Elapsed: 0.79 sec; 599.50 MB written ; 0.00 secs to go; 757.27 MB/sec ; 1,380.69 IOPS Writing 660 MB with bufferSize: 1,024 KB Elapsed: 0.00 sec; 0.00 MB written ; Infinity secs to go; 0.00 MB/sec ; 38,301.56 IOPS Elapsed: 0.22 sec; 100.00 MB written ; 1.24 secs to go; 451.86 MB/sec ; 457.60 IOPS ... Elapsed: 1.11 sec; 659.00 MB written ; 0.00 secs to go; 593.67 MB/sec ; 745.08 IOPS Finished tests. Exiting... Starting sequential read test... Reading 60 MB with bufferSize: 1 KB Elapsed: 0.00 sec; 0.00 MB read ; Infinity secs to go; 0.00 MB/sec ; 231,096.61 IOPS ; currentPosition: 1,024 Elapsed: 0.01 sec; 1.07 MB read ; 0.71 secs to go; 82.59 MB/sec ; 136,533.48 IOPS ; currentPosition: 1,127,424 ... Elapsed: 0.12 sec; 60.00 MB read ; 0.00 secs to go; 491.95 MB/sec ; 1,380,787.22 IOPS ; currentPosition: 62,914,560 Reading 120 MB with bufferSize: 2 KB Elapsed: 0.00 sec; 0.00 MB read ; Infinity secs to go; 0.00 MB/sec ; 5,833,522.92 IOPS ; currentPosition: 2,048 Elapsed: 0.00 sec; 1.95 MB read ; 0.11 secs to go; 1,033.35 MB/sec ; 617,591.60 IOPS ; currentPosition: 2,050,048 ... Elapsed: 0.21 sec; 120.00 MB read ; 0.00 secs to go; 584.16 MB/sec ; 1,193,005.65 IOPS ; currentPosition: 125,829,120 Reading 180 MB with bufferSize: 4 KB Elapsed: 0.00 sec; 0.00 MB read ; Infinity secs to go; 0.00 MB/sec ; 1,378,309.09 IOPS ; currentPosition: 4,096 Elapsed: 0.00 sec; 3.52 MB read ; 0.15 secs to go; 1,196.74 MB/sec ; 425,243.39 IOPS ; currentPosition: 3,690,496 ... Elapsed: 0.11 sec; 180.00 MB read ; 0.00 secs to go; 1,696.99 MB/sec ; 2,495,480.41 IOPS ; currentPosition: 188,743,680 Reading 240 MB with bufferSize: 8 KB Elapsed: 0.00 sec; 0.00 MB read ; Infinity secs to go; 0.00 MB/sec ; 14,347,459.60 IOPS ; currentPosition: 8,192 Elapsed: 0.00 sec; 6.25 MB read ; 0.11 secs to go; 2,211.99 MB/sec ; 297,690.04 IOPS ; currentPosition: 6,561,792 ... Elapsed: 0.10 sec; 239.99 MB read ; 0.00 secs to go; 2,322.77 MB/sec ; 884,385.40 IOPS ; currentPosition: 251,658,240 Reading 300 MB with bufferSize: 16 KB Elapsed: 0.00 sec; 0.00 MB read ; Infinity secs to go; 0.00 MB/sec ; 15,635,470.18 IOPS ; currentPosition: 16,384 Elapsed: 0.00 sec; 10.94 MB read ; 0.10 secs to go; 3,003.41 MB/sec ; 199,523.54 IOPS ; currentPosition: 11,485,184 ... Elapsed: 0.10 sec; 299.98 MB read ; 0.00 secs to go; 3,136.77 MB/sec ; 409,440.53 IOPS ; currentPosition: 314,572,800 Reading 360 MB with bufferSize: 32 KB Elapsed: 0.00 sec; 0.00 MB read ; Infinity secs to go; 0.00 MB/sec ; 6,302,984.46 IOPS ; currentPosition: 32,768 Elapsed: 0.01 sec; 18.75 MB read ; 0.19 secs to go; 1,817.36 MB/sec ; 59,752.26 IOPS ; currentPosition: 19,693,568 ... Elapsed: 0.16 sec; 359.97 MB read ; 0.00 secs to go; 2,206.78 MB/sec ; 282,713.75 IOPS ; currentPosition: 377,487,360 Reading 420 MB with bufferSize: 64 KB Elapsed: 0.00 sec; 0.00 MB read ; Infinity secs to go; 0.00 MB/sec ; 5,709,587.54 IOPS ; currentPosition: 65,536 Elapsed: 0.01 sec; 31.25 MB read ; 0.18 secs to go; 2,143.96 MB/sec ; 34,719.25 IOPS ; currentPosition: 32,833,536 ... Elapsed: 0.18 sec; 419.94 MB read ; 0.00 secs to go; 2,360.91 MB/sec ; 89,930.29 IOPS ; currentPosition: 440,401,920 Reading 480 MB with bufferSize: 128 KB Elapsed: 0.00 sec; 0.00 MB read ; Infinity secs to go; 0.00 MB/sec ; 4,877,989.29 IOPS ; currentPosition: 131,072 ... Elapsed: 0.14 sec; 479.88 MB read ; 0.00 secs to go; 3,363.88 MB/sec ; 49,272.96 IOPS ; currentPosition: 503,316,480 Reading 540 MB with bufferSize: 256 KB Elapsed: 0.00 sec; 0.00 MB read ; Infinity secs to go; 0.00 MB/sec ; 1,582,395.32 IOPS ; currentPosition: 262,144 ... Elapsed: 0.17 sec; 539.75 MB read ; 0.00 secs to go; 3,163.63 MB/sec ; 54,851.40 IOPS ; currentPosition: 566,231,040 Reading 600 MB with bufferSize: 512 KB Elapsed: 0.00 sec; 0.00 MB read ; Infinity secs to go; 0.00 MB/sec ; 284,051.37 IOPS ; currentPosition: 524,288 ... Elapsed: 0.19 sec; 599.50 MB read ; 0.00 secs to go; 3,089.56 MB/sec ; 6,430.08 IOPS ; currentPosition: 629,145,600 Reading 660 MB with bufferSize: 1,024 KB Elapsed: 0.00 sec; 0.00 MB read ; Infinity secs to go; 0.00 MB/sec ; 167,234.15 IOPS ; currentPosition: 1,048,576 ... Elapsed: 0.22 sec; 659.00 MB read ; 0.00 secs to go; 3,051.84 MB/sec ; 5,022.31 IOPS ; currentPosition: 692,060,160 Finished tests. Exiting...