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.TH ext4dist 8 "2016-02-12" "USER COMMANDS" | ||
.SH NAME | ||
ext4dist \- Summarize ext4 operation latency. Uses Linux eBPF/bcc. | ||
.SH SYNOPSIS | ||
.B ext4dist [\-h] [\-T] [\-N] [\-d] [interval] [count] | ||
.SH DESCRIPTION | ||
This tool summarizes time (latency) spent in common ext4 file operations: reads, | ||
writes, opens, and syncs, and presents it as a power-of-2 histogram. It uses an | ||
in-kernel eBPF map to store the histogram for efficiency. | ||
|
||
Since this works by tracing the ext4_file_operations interface functions, it | ||
will need updating to match any changes to these functions. | ||
|
||
Since this uses BPF, only the root user can use this tool. | ||
.SH REQUIREMENTS | ||
CONFIG_BPF and bcc. | ||
.SH OPTIONS | ||
.TP | ||
\-h | ||
Print usage message. | ||
.TP | ||
\-T | ||
Don't include timestamps on interval output. | ||
.TP | ||
\-m | ||
Output in milliseconds. | ||
.TP | ||
\-p PID | ||
Trace this PID only. | ||
.SH EXAMPLES | ||
.TP | ||
Trace ext4 operation time, and print a summary on Ctrl-C: | ||
# | ||
.B ext4dist | ||
.TP | ||
Trace PID 181 only: | ||
# | ||
.B ext4dist -p 181 | ||
.TP | ||
Print 1 second summaries, 10 times: | ||
# | ||
.B ext4dist 1 10 | ||
.TP | ||
1 second summaries, printed in milliseconds | ||
# | ||
.B ext4dist \-m 1 | ||
.SH FIELDS | ||
.TP | ||
msecs | ||
Range of milliseconds for this bucket. | ||
.TP | ||
usecs | ||
Range of microseconds for this bucket. | ||
.TP | ||
count | ||
Number of operations in this time range. | ||
.TP | ||
distribution | ||
ASCII representation of the distribution (the count column). | ||
.SH OVERHEAD | ||
This adds low-overhead instrumentation to these ext4 operations, | ||
including reads and writes from the file system cache. Such reads and writes | ||
can be very frequent (depending on the workload; eg, 1M/sec), at which | ||
point the overhead of this tool may become noticeable. | ||
Measure and quantify before use. | ||
.SH SOURCE | ||
This is from bcc. | ||
.IP | ||
https://github.com/iovisor/bcc | ||
.PP | ||
Also look in the bcc distribution for a companion _examples.txt file containing | ||
example usage, output, and commentary for this tool. | ||
.SH OS | ||
Linux | ||
.SH STABILITY | ||
Unstable - in development. | ||
.SH AUTHOR | ||
Brendan Gregg | ||
.SH SEE ALSO | ||
ext4snoop(8) |
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.TH ext4slower 8 "2016-02-11" "USER COMMANDS" | ||
.SH NAME | ||
ext4slower \- Trace slow ext4 file operations, with per-event details. | ||
.SH SYNOPSIS | ||
.B ext4slower [\-h] [\-j] [\-p PID] [min_ms] | ||
.SH DESCRIPTION | ||
This tool traces common ext4 file operations: reads, writes, opens, and | ||
syncs. It measures the time spent in these operations, and prints details | ||
for each that exceeded a threshold. | ||
|
||
WARNING: See the OVERHEAD section. | ||
|
||
By default, a minimum millisecond threshold of 10 is used. If a threshold of 0 | ||
is used, all events are printed (warning: verbose). | ||
|
||
Since this works by tracing the ext4_file_operations interface functions, it | ||
will need updating to match any changes to these functions. | ||
|
||
Since this uses BPF, only the root user can use this tool. | ||
.SH REQUIREMENTS | ||
CONFIG_BPF and bcc. | ||
.SH OPTIONS | ||
\-p PID | ||
Trace this PID only. | ||
.TP | ||
min_ms | ||
Minimum I/O latency (duration) to trace, in milliseconds. Default is 10 ms. | ||
.SH EXAMPLES | ||
.TP | ||
Trace synchronous file reads and writes slower than 10 ms: | ||
# | ||
.B ext4slower | ||
.TP | ||
Trace slower than 1 ms: | ||
# | ||
.B ext4slower 1 | ||
.TP | ||
Trace slower than 1 ms, and output just the fields in parsable format (csv): | ||
# | ||
.B ext4slower \-j 1 | ||
.TP | ||
Trace all file reads and writes (warning: the output will be verbose): | ||
# | ||
.B ext4slower 0 | ||
.TP | ||
Trace slower than 1 ms, for PID 181 only: | ||
# | ||
.B ext4slower \-p 181 1 | ||
.SH FIELDS | ||
.TP | ||
TIME(s) | ||
Time of I/O completion since the first I/O seen, in seconds. | ||
.TP | ||
COMM | ||
Process name. | ||
.TP | ||
PID | ||
Process ID. | ||
.TP | ||
T | ||
Type of operation. R == read, W == write, O == open, S == fsync. | ||
.TP | ||
OFF_KB | ||
File offset for the I/O, in Kbytes. | ||
.TP | ||
BYTES | ||
Size of I/O, in bytes. | ||
.TP | ||
LAT(ms) | ||
Latency (duration) of I/O, measured from when it was issued by VFS to the | ||
filesystem, to when it completed. This time is inclusive of block device I/O, | ||
file system CPU cycles, file system locks, run queue latency, etc. It's a more | ||
accurate measure of the latency suffered by applications performing file | ||
system I/O, than to measure this down at the block device interface. | ||
.TP | ||
FILENAME | ||
A cached kernel file name (comes from dentry->d_iname). | ||
.TP | ||
ENDTIME_us | ||
Completion timestamp, microseconds (\-j only). | ||
.TP | ||
OFFSET_b | ||
File offset, bytes (\-j only). | ||
.TP | ||
LATENCY_us | ||
Latency (duration) of the I/O, in microseconds (\-j only). | ||
.SH OVERHEAD | ||
This adds low-overhead instrumentation to these ext4 operations, | ||
including reads and writes from the file system cache. Such reads and writes | ||
can be very frequent (depending on the workload; eg, 1M/sec), at which | ||
point the overhead of this tool (even if it prints no "slower" events) can | ||
begin to become significant. Measure and quantify before use. If this | ||
continues to be a problem, consider switching to a tool that prints in-kernel | ||
summaries only. | ||
.PP | ||
Note that the overhead of this tool should be less than fileslower(8), as | ||
this tool targets ext4 functions only, and not all file read/write paths | ||
(which can include socket I/O). | ||
.SH SOURCE | ||
This is from bcc. | ||
.IP | ||
https://github.com/iovisor/bcc | ||
.PP | ||
Also look in the bcc distribution for a companion _examples.txt file containing | ||
example usage, output, and commentary for this tool. | ||
.SH OS | ||
Linux | ||
.SH STABILITY | ||
Unstable - in development. | ||
.SH AUTHOR | ||
Brendan Gregg | ||
.SH SEE ALSO | ||
biosnoop(8), funccount(8), fileslower(8) |
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.TH xfsdist 8 "2016-02-12" "USER COMMANDS" | ||
.SH NAME | ||
xfsdist \- Summarize XFS operation latency. Uses Linux eBPF/bcc. | ||
.SH SYNOPSIS | ||
.B xfsdist [\-h] [\-T] [\-N] [\-d] [interval] [count] | ||
.SH DESCRIPTION | ||
This tool summarizes time (latency) spent in common XFS file operations: reads, | ||
writes, opens, and syncs, and presents it as a power-of-2 histogram. It uses an | ||
in-kernel eBPF map to store the histogram for efficiency. | ||
|
||
Since this works by tracing the xfs_file_operations interface functions, it | ||
will need updating to match any changes to these functions. | ||
|
||
Since this uses BPF, only the root user can use this tool. | ||
.SH REQUIREMENTS | ||
CONFIG_BPF and bcc. | ||
.SH OPTIONS | ||
.TP | ||
\-h | ||
Print usage message. | ||
.TP | ||
\-T | ||
Don't include timestamps on interval output. | ||
.TP | ||
\-m | ||
Output in milliseconds. | ||
.TP | ||
\-p PID | ||
Trace this PID only. | ||
.SH EXAMPLES | ||
.TP | ||
Trace XFS operation time, and print a summary on Ctrl-C: | ||
# | ||
.B xfsdist | ||
.TP | ||
Trace PID 181 only: | ||
# | ||
.B xfsdist -p 181 | ||
.TP | ||
Print 1 second summaries, 10 times: | ||
# | ||
.B xfsdist 1 10 | ||
.TP | ||
1 second summaries, printed in milliseconds | ||
# | ||
.B xfsdist \-m 1 | ||
.SH FIELDS | ||
.TP | ||
msecs | ||
Range of milliseconds for this bucket. | ||
.TP | ||
usecs | ||
Range of microseconds for this bucket. | ||
.TP | ||
count | ||
Number of operations in this time range. | ||
.TP | ||
distribution | ||
ASCII representation of the distribution (the count column). | ||
.SH OVERHEAD | ||
This adds low-overhead instrumentation to these XFS operations, | ||
including reads and writes from the file system cache. Such reads and writes | ||
can be very frequent (depending on the workload; eg, 1M/sec), at which | ||
point the overhead of this tool may become noticeable. | ||
Measure and quantify before use. | ||
.SH SOURCE | ||
This is from bcc. | ||
.IP | ||
https://github.com/iovisor/bcc | ||
.PP | ||
Also look in the bcc distribution for a companion _examples.txt file containing | ||
example usage, output, and commentary for this tool. | ||
.SH OS | ||
Linux | ||
.SH STABILITY | ||
Unstable - in development. | ||
.SH AUTHOR | ||
Brendan Gregg | ||
.SH SEE ALSO | ||
xfssnoop(8) |
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