- testing 0.25.0+ds-2
- unstable 0.26.0+ds-1
- experimental 0.26.0+ds-2~experimental1
|biopattern(8)||System Manager's Manual||biopattern(8)|
biopattern - Identify random/sequential disk access patterns.
biopattern [-h] [-d DISK] [interval] [count]
This traces block device I/O (disk I/O), and prints ratio of random/sequential I/O for each disk or the specified disk either on Ctrl-C, or after a given interval in seconds.
This works by tracing kernel tracepoint block:block_rq_complete.
Since this uses BPF, only the root user can use this tool.
CONFIG_BPF and bcc.
- Trace access patterns of all disks, and print a summary on Ctrl-C:
- # biopattern
- Trace disk sdb only:
- # biopattern -d sdb
- Print 1 second summaries, 10 times:
- # biopattern 1 10
Since block device I/O usually has a relatively low frequency (< 10,000/s), the overhead for this tool is expected to be low or negligible. For high IOPS storage systems, test and quantify before use.
This is from bcc.
Also look in the bcc distribution for a companion _examples.txt file containing example usage, output, and commentary for this tool.
Unstable - in development.
biosnoop(8), biolatency(8), iostat(1)