lagscope

Summary

A Linux/Windows tool to measure the network transport layer latency.

Features

• Support network transport layer latency measurement (round-trip latency).

• Support specifying ping message size, and ping interval.

• Support two test modes: test-duration mode and ping-iteration mode.

• Support histogram reporting and percentile reporting.

• Support interop test with Windows latte.exe.

• Support running natively on both Linux and Windows Operating Systems.

Getting Started

Building & installing lagscope

Linux:

Install cmake & gcc and then run the following commands in “terminal shell”.

./do-cmake.sh build
./do-cmake.sh install

lagscope is installed to /usr/local/bin/lagscope.

Windows:

Download Build Tools for Visual Studio; then install C++ build tools workload with default options and then run the following commands in “Developer Command Prompt”.

.\do-cmake.bat build
.\do-cmake.bat install

lagscope is installed to C:\Program Files (x86)\Lagscope\bin\lagscope.

Usage

lagscope -h

Known issues

• UDP is not supported.

Examples of how to run lagscope as a receiver

To measure the network TCP latency between two multi-core serves running Ubuntu 1604, NODE1 (192.168.4.1) and NODE2 (192.168.4.2).

On NODE1 (the receiver), run:

./lagscope -r

(Translation: Run lagscope as a receiver with default settings. See the output from ./lagscope -h for more details about the default settings.)

Example run Histogram

On NODE2 (the sender), run:

./lagscope -s192.168.4.1 -H -a10 -l1 -c98

(Translation: Run lagscope as a sender, with default test settings; report histogram value with customized factors.)

Example sender-side output from a given run:

simonxiao@NODE2:~/lagscope/src# ./lagscope -s192.168.4.1 -H -a10 -l1 -c98
lagscope 0.1.1
---------------------------------------------------------
13:19:44 INFO: New connection: local:13948 [socket:3] --> 192.168.4.1:6001
13:36:24 INFO: TEST COMPLETED.
13:36:24 INFO: Ping statistics for 192.168.4.1:
13:36:24 INFO:  Number of successful Pings: 1000000
13:36:24 INFO:  Minimum = 30.994us, Maximum = 8699.894us, Average = 54.063us
Interval(usec)   Frequency
      0          0
     10          0
     11          0
     12          0
     ...
     50          75086
     51          116062
     52          36401
     53          27288
     54          19781
     55          16578
     56          29390
     57          8965
     58          8980
     59          8812
     60          8418
     ...
    100          519
    101          472
    102          849
    103          324
    104          324
    105          327
    106          291
    107          288
    108          6107

Example run Percentile

On NODE2 (the sender), run:

./lagscope -s192.168.4.1 -P

(Translation: Run lagscope as a sender. Prints these percentiles of the latencies: 50%, 75%, 90%, 95%, 99%, 99.9%, 99.99%, 99.999%.)

Option for dumping the latency frequency table into a JSON file, run:

./lagscope -s192.168.4.1 -Platencies_table.json

(Translation: Run lagscope as a sender. Prints percentiles and dumps a latency frequency table into a JSON file)

Example sender-side output from a given run:

paulkim@NODE2:~/lagscope/src# ./lagscope -s192.168.4.1 -P
lagscope 0.1.2
---------------------------------------------------------
17:49:03 INFO: New connection: local:13948 [socket:3] --> 192.168.4.1:6001
17:50:37 INFO: TEST COMPLETED.
17:50:37 INFO: Ping statistics for 192.168.4.1:
17:50:37 INFO:  Number of successful Pings: 1000000
17:50:37 INFO:  Minimum = 72.002us, Maximum = 4552.126us, Average = 92.055us

Percentile       Latency(us)
     50%         80
     75%         102
     90%         113
     95%         142
     99%         210
   99.9%         410
  99.99%         2566
 99.999%         3921


paulkim@NODE2:~/lagscope/src# ./lagscope -s192.168.4.1 -Platencies_table.json
lagscope 0.1.2
---------------------------------------------------------
17:49:03 INFO: New connection: local:13948 [socket:3] --> 192.168.4.1:6001
17:50:37 INFO: TEST COMPLETED.
17:50:37 INFO: Ping statistics for 192.168.4.1:
17:50:37 INFO:  Number of successful Pings: 1000000
17:50:37 INFO:  Minimum = 72.002us, Maximum = 4552.126us, Average = 92.055us
17:50:38 INFO: Dumping latency frequency table into json file: latencies_table.json

Percentile       Latency(us)
     50%         80
     75%         102
     90%         113
     95%         142
     99%         210
   99.9%         410
  99.99%         2566
 99.999%         3921

Example run to dump all latency values into a csv file

On NODE2 (the sender), run:

./lagscope -s192.168.4.1 -Rlatencies_log.csv

(Translation: Run lagscope as a sender and dumps latencies into a csv file)

Example sender-side output from a given run:

paulkim@NODE2:~/lagscope/src# ./lagscope -s192.168.4.1 -Rlatencies_log.csv
lagscope 0.1.2
---------------------------------------------------------
19:38:31 INFO: New connection: local:13948 [socket:3] --> 192.168.4.1:6001
19:38:32 INFO: TEST COMPLETED.
19:38:32 INFO: Ping statistics for 192.168.4.1:
19:38:32 INFO:  Number of successful Pings: 1000000
19:38:32 INFO:  Minimum = 96.083us, Maximum = 2828.121us, Average = 147.913us
19:38:32 INFO: Dumping all latencies into csv file: latencies_log.csv

Save latency frequency table graph as an image file

Installation Requirements:

• Python3
• pip3

Library Dependencies:

• matplotlib
• pandas
• numpy

To install libraries:

pip3 install matplotlib pandas numpy

Known Issue:

Missing module, tkinter, not installed with Python3.

To install tkinter:

sudo apt-get install python3-tk

Usage

python3 visualize_data.py -h

To Run

python3 visualize_data.py -json freq_table.json -img freq_graph.png

Example run:

paulkim@NODE2:~/lagscope/src# python3 visualize_data.py -json freq_table.json -img freq_graph.png
INFO: Graph construction from freq_table.json is in progress...
INFO: Graph construction completed
INFO: Graph created in: freq_graph.png

Related topics

1. Latte – The Windows tool for latency measurement

2. NTTTCP-for-Linux

3. Microsoft Server & Cloud Blog

4. HyperV Linux Integrated Services Test

Terms of Use

By downloading and running this project, you agree to the license terms of the third-party application software, Microsoft products, and components to be installed.

The third-party software and products are provided to you by third parties. You are responsible for reading and accepting the relevant license terms for all software that will be installed. Microsoft grants you no rights to third party software.

License

The MIT License (MIT)

Copyright (c) 2016 Microsoft Corporation

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.