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26 lines
1.2 KiB
26 lines
1.2 KiB
Demonstrations of bitehist.py, the Linux eBPF/bcc version.
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This prints a power-of-2 histogram to show the block I/O size distribution.
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A summary is printed after Ctrl-C is hit.
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# ./bitehist.py
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Tracing... Hit Ctrl-C to end.
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^C
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kbytes : count distribution
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0 -> 1 : 3 | |
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2 -> 3 : 0 | |
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4 -> 7 : 211 |********** |
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8 -> 15 : 0 | |
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16 -> 31 : 0 | |
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32 -> 63 : 0 | |
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64 -> 127 : 1 | |
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128 -> 255 : 800 |**************************************|
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This output shows a bimodal distribution. The largest mod of 800 I/O were
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between 128 and 255 Kbytes in size, and another mode of 211 I/O were between
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4 and 7 Kbytes in size.
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Understanding this distribution is useful for characterizing workloads and
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understanding performance. The existence of this distribution is not visible
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from averages alone.
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