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man(1) General Commands Manual man(1)

NAME

nfsometer - NFS performance measurement tool

SYNOPSIS

nfsometer [options] [mode] [[<server:path>] [workloads...]]

DESCRIPTION

nfsometer is a performance measurement framework for running workloads and reporting results across NFS protocol versions, NFS options and Linux NFS client implementations

MODES

Basic usage (no mode specified):


nfsometer <server:path> [workloads...]


This will fetch needed files, run traces, and generate reports,
same as running the the 'fetch', 'trace' and 'report' stages.

Advanced usage (specify modes):


nfsometer list


List the contents of the results directory.


nfsometer workloads


List available and unavailable workloads.


nfsometer notes


Edit the notes file of the results directory. These notes will
be displayed in report headers.


nfsometer loadgen <server:path> <workload>


Run in loadgen mode: don't record any stats, just loop over
<workload> against <server:path>. Only one -o option is allowed.
Use the -n option to run multuple instances of the loadgen workload.
When running more than one instance, the intial start times are
staggered.


nfsometer fetch [workloads...]


Fetch all needed files for the specified workload(s). If no
workloads are specified, all workloads are fetched.
Fetched files are only downloaded once and are cached for
future runs.


nfsometer trace <server:path> [workloads...]


Run traces against <server:path>. The traces run will be:
(options + always options + tags) X (workloads) X (num runs)
This will only run traces that don't already exist in the results
directory.


nfsometer report


Generate all reports available from the results directory.


nfsometer example


Show examples from man page

OPTIONS

The directory used to save results. default: '/root/nfsometer_results'

Mount options to iterate through. This option may be used multiple times. Each mount option must have a version specified.

Options added to every trace. This option may be used multiple times.

Tag all new traces with 'tags'. This option may be used multiple times.

Number of runs for each trace of <options> X <tags> X <workloads> default: 1

Generate graphs inline while generating reports. Useful for debugging graphing issues.

Randomize the order of traces

Show the help message

EXAMPLES

Example 1: See what workloads are available


$ nfsometer workloads


This command lists available workloads and will tell you why
workloads are unavailable (if any exist).

Example 2: Compare cthon, averaged over 3 runs,
across nfs protocol versions


nfsometer -n 3 server:/export cthon


This example uses the default for -o: "-o v3 -o v4 -o v4.1".
To see the results, open results/index.html in a web browser.

Example 3: Compare cthon, averaged over 3 runs,
between v3 and v4.0 only


nfsometer -n 3 -o v3 -o v4 server:/export cthon


This example specifies v3 and v4 only.
To see the results, open results/index.html in a web browser.

Example 4: Compare two kernels running iozone workload, averaged
over 2 runs, across all nfs protocol versions


nfsometer can compare two (or more) kernel versions, but
has no way of building, installing or booting new kernels.
It's up to the user to install new kernels.
In order for these kernels to be differentiated, 'uname -a'
must be different.


1) boot into kernel #1


2) nfsometer -n 2 server:/export iozone


3) boot into kernel #2


4) nfsometer -n 2 server:/export iozone


5) open results/index.html in a web browser


To see the results, open results/index.html in a web browser.

Example 5: Using tags


Tags (the -t option) can be used to mark nfsometer runs as
occurring with some configuration not captured by mount options
or detectable tags, such as different sysctl settings (client side),
different server side options, or different network conditions.


1) set server value foo to 2.3


2) nfsometer -o v4 -o v4.1 -t foo=2.3


3) set server value foo to 10


4) nfsometer -o v4 -o v4.1 -t foo=10


What is passed to -t is entirely up to the user - it will not be
interpreted or checked by nfsometer at all, so be careful!


To see the results, open results/index.html in a web browser.

Example 6: Always options


The -o flag specifies distinct option sets to run, but sometimes
there are options that should be present in each. Instead of
writing each one out, you can use the -a option:


nfsometer -o v3 -o v4 -a sec=krb5 server:/export iozone


this is equivalent to:


nfsometer -o v3,sec=krb5 -o v4,sec=krb5 server:/export iozone

Example 7: Using the "custom" workload


A main use case of nfsometer is the "custom" workload - it allows
the user to specify the command that nfsometer is to run.


NOTE: the command's cwd (current working directory) is the runroot
created on the server.


export NFSOMETER_CMD="echo foo > bar"
export NFSOMETER_NAME="echo"
export NFSOMETER_DESC="Writes 4 bytes to a file"
nfsometer server:/export custom


This will run 3 traces (v3, v4, v4.1) against server:/export of
the command: echo foo > bar.

Example 8: Using the loadgen mode


Loadgen runs several instances of a workload without capturing
traces. The idea is that you use several clients to generate
load, then another client to measure performance of a loaded
server. The "real" run of nfsometer (not loadgen) should mark
the traces using the -t option.


1) On client A, run the cthon workload to get a baseline of
a server without any load.


nfsometer trace server:/export cthon


2) When that's done, start loadgen on client B:


nfsometer -n 10 loadgen server:/export dd_100m_1k


This runs 10 instances of dd_100m_1k workload on server:/export.
It can take several minutes to start in an attempt to stagger
all the workload instances.


3) once all instances are started, run the "real" nfsometer
trace on client A. Use the -t option to mark the traces
as having run under load conditions:


nfsometer -t "10_dd" trace server:/export cthon


4) Explain how the tests were set up in the result notes.
This should be run on client A (which has the traces:


nfsometer notes


5) Now generate the reports:


nfsometer report

Example 8: Long running nfsometer trace


The nfsometer.py script currently runs in the foreground. As
such, it will be killed if the tty gets a hangup or the connection
to the client is closed.


For the time being, nfsometer should be run in a screen
session, or run with nohup and the output redirected to a file.


1) screen -RD
2) nfsometer -n 2 server:/export iozone
3) close terminal window (or ^A^D)
...
4) reattach later with screen -RD
5) once nfsometer.py is done, results will be in results/index.html

SEE ALSO

mountstats, nfsstats

BUGS

No known bugs.

AUTHOR

Weston Andros Adamson (dros@netapp.com)

1.9 nfsometer