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✏️ Editing: dirtop_example.txt

Demonstrations of dirtop, the Linux eBPF/bcc version.

dirtop shows reads and writes by directory. For example:

# ./dirtop.py -d '/hdfs/uuid/*/yarn'
Tracing... Output every 1 secs. Hit Ctrl-C to end

14:28:12 loadavg: 25.00 22.85 21.22 31/2921 66450

READS  WRITES R_Kb     W_Kb     PATH
1030   2852   8        147341   /hdfs/uuid/c11da291-28de-4a77-873e-44bb452d238b/yarn
3308   2459   10980    24893    /hdfs/uuid/bf829d08-1455-45b8-81fa-05c3303e8c45/yarn
2227   7165   6484     11157    /hdfs/uuid/76dc0b77-e2fd-4476-818f-2b5c3c452396/yarn
1985   9576   6431     6616     /hdfs/uuid/99c178d5-a209-4af2-8467-7382c7f03c1b/yarn
1986   398    6474     6486     /hdfs/uuid/7d512fe7-b20d-464c-a75a-dbf8b687ee1c/yarn
764    3685   5        7069     /hdfs/uuid/250b21c8-1714-45fe-8c08-d45d0271c6bd/yarn
432    1603   259      6402     /hdfs/uuid/4a833770-767e-43b3-b696-dc98901bce26/yarn
993    5856   320      129      /hdfs/uuid/b94cbf3f-76b1-4ced-9043-02d450b9887c/yarn
612    5645   4        249      /hdfs/uuid/8138a53b-b942-44d3-82df-51575f1a3901/yarn
818    21     6        166      /hdfs/uuid/fada8004-53ff-48df-9396-165d8e42925b/yarn
174    23     1        171      /hdfs/uuid/d04fccd8-bc72-4ed9-bda4-c5b6893f1405/yarn
376    6281   2        97       /hdfs/uuid/0cc3683f-4800-4c73-8075-8d77dc7cf116/yarn
370    4588   2        96       /hdfs/uuid/a78f846a-58c4-4d10-a9f5-42f16a6134a0/yarn
190    6420   1        86       /hdfs/uuid/2c6a7223-cb18-4916-a1b6-8cd02bda1d31/yarn
178    123    1        17       /hdfs/uuid/b3b2a2ed-f6c1-4641-86bf-2989dd932411/yarn
[...]

This shows various directories read and written when hadoop runs.
By default the output is sorted by the total read size in Kbytes (R_Kb).
Sorting order can be changed via -s option.
This is instrumenting at the VFS interface, so this is reads and writes that
may return entirely from the file system cache (page cache).

While not printed, the average read and write size can be calculated by
dividing R_Kb by READS, and the same for writes.

This script works by tracing the vfs_read() and vfs_write() functions using
kernel dynamic tracing, which instruments explicit read and write calls. If
files are read or written using another means (eg, via mmap()), then they
will not be visible using this tool.

This should be useful for file system workload characterization when analyzing
the performance of applications.

Note that tracing VFS level reads and writes can be a frequent activity, and
this tool can begin to cost measurable overhead at high I/O rates.

A -C option will stop clearing the screen, and -r with a number will restrict
the output to that many rows (20 by default). For example, not clearing
the screen and showing the top 5 only:

# ./dirtop -d '/hdfs/uuid/*/yarn' -Cr 5
Tracing... Output every 1 secs. Hit Ctrl-C to end

14:29:08 loadavg: 25.66 23.42 21.51 17/2850 67167

READS  WRITES R_Kb     W_Kb     PATH
100    8429   0        48243    /hdfs/uuid/b94cbf3f-76b1-4ced-9043-02d450b9887c/yarn
2066   4091   8176     26457    /hdfs/uuid/d04fccd8-bc72-4ed9-bda4-c5b6893f1405/yarn
10     2043   0        8172     /hdfs/uuid/b3b2a2ed-f6c1-4641-86bf-2989dd932411/yarn
38     1368   0        2652     /hdfs/uuid/a78f846a-58c4-4d10-a9f5-42f16a6134a0/yarn
86     19     0        123      /hdfs/uuid/c11da291-28de-4a77-873e-44bb452d238b/yarn

14:29:09 loadavg: 25.66 23.42 21.51 15/2849 67170

READS  WRITES R_Kb     W_Kb     PATH
1204   5619   4388     33767    /hdfs/uuid/b94cbf3f-76b1-4ced-9043-02d450b9887c/yarn
2208   3511   8744     22992    /hdfs/uuid/d04fccd8-bc72-4ed9-bda4-c5b6893f1405/yarn
62     4010   0        21181    /hdfs/uuid/8138a53b-b942-44d3-82df-51575f1a3901/yarn
22     2187   0        8748     /hdfs/uuid/b3b2a2ed-f6c1-4641-86bf-2989dd932411/yarn
74     1097   0        4388     /hdfs/uuid/4a833770-767e-43b3-b696-dc98901bce26/yarn

[..]

USAGE message:

# ./dirtop.py  -h
usage: dirtop.py [-h] [-C] [-r MAXROWS] [-s {all,reads,writes,rbytes,wbytes}]
                 [-p PID] -d ROOTDIRS
                 [interval] [count]

File reads and writes by process

positional arguments:
  interval              output interval, in seconds
  count                 number of outputs

optional arguments:
  -h, --help            show this help message and exit
  -C, --noclear         don't clear the screen
  -r MAXROWS, --maxrows MAXROWS
                        maximum rows to print, default 20
  -s {all,reads,writes,rbytes,wbytes}, --sort {all,reads,writes,rbytes,wbytes}
                        sort column, default all
  -p PID, --pid PID     trace this PID only
  -d ROOTDIRS, --root-directories ROOTDIRS
                        select the directories to observe, separated by commas

examples:
    ./dirtop -d '/hdfs/uuid/*/yarn'       # directory I/O top, 1 second refresh
    ./dirtop -d '/hdfs/uuid/*/yarn' -C    # don't clear the screen
    ./dirtop -d '/hdfs/uuid/*/yarn' 5     # 5 second summaries
    ./dirtop -d '/hdfs/uuid/*/yarn' 5 10  # 5 second summaries, 10 times only
    ./dirtop -d '/hdfs/uuid/*/yarn,/hdfs/uuid/*/data' # Running dirtop on two set of directories

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