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"sqlio -kW -b64" - Writing 64-KB Block Test
How to perform tests for writing 64 KB files? My Website allows users to upload picture files with an average of 64 KB per file.
✍: FYIcenter.com
If you want to know how your environment performs
on writing 64 KB files, you can use the following SQLIO options:
Below is a test result SQLIO with above options on a Dell computer hard disk with Windows 8:
C:\fyicenter\SQLIO>sqlio -LS -kW -b64 -i64 -f64 -t1 -s300 1 thread writing for 300 secs to file testfile.dat using 64KB IOs over 4096KB stripes with 64 IOs per run size of file testfile.dat needs to be: 268435456 bytes initialization done CUMULATIVE DATA: throughput metrics: IOs/sec: 487.31 MBs/sec: 30.45 latency metrics: Min_Latency(ms): 0 Avg_Latency(ms): 1 Max_Latency(ms): 280 histogram: ms: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24+ %: 59 13 11 6 3 3 1 1 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0
As you can see, this Dell computer is capable to write 487 files of 64 KB per second to the hard disk in a single thread without any buffering.
The average latency of writing a 64-KB block is about 1 milliseconds. In other words, your users should be able to upload a file to your Website in 1 millisecond if we ignore the impact of the Web server software.
Comparing to the data reading test in the previous tutorial, the result might be a surprise to many of us. This Dell computer writes data at a speed of 30.45 MBs/sec, but reads data at a speed of 8.77 MBs/sec. So writing data is 3.5 times faster than reading data!
Usually, hard disks are capable to read faster than write. But in the case of 64-KB block I/O tests, operating system caching mechanism helps writing more than reading. See next tutorials on performance impact of block size.
⇒ Windows Resource Monitor - Disk Writing Speed
⇐ Windows Resource Monitor - Disk Reading Speed
2019-08-23, 463👍, 0💬
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