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<a href=/index.xml target=_blank class=hob>RSS</a></nav></header><main role=main><article itemtype=http://schema.org/Article><h1 itemtype=headline>Profiling Python web applications with visual tools</h1><p><cap>post</cap>, Apr 21, 2017 on <a href=https://mitjafelicijan.com>Mitja Felicijan's blog</a><div><p>I have been profiling my software with KCachegrind for a long time now and I was
missing this option when I am developing API's or other web services. I always
knew that this is possible but never really took the time and dive into it.<p>Before we begin there are some requirements. We will need to:<ul><li>implement <a href=https://docs.python.org/2/library/profile.html#module-cProfile>cProfile</a> into our web app,<li>convert output to <a href=http://valgrind.org/docs/manual/cl-manual.html>callgrind</a> format with <a href=https://pypi.python.org/pypi/pyprof2calltree/>pyprof2calltree</a>,<li>visualize data with <a href=http://kcachegrind.sourceforge.net/html/Home.html>KCachegrind</a> or <a href=http://www.profilingviewer.com/>Profiling Viewer</a>.</ul><p>If you are using MacOS you should check out <a href=http://www.profilingviewer.com/>Profiling
Viewer</a> or
<a href=http://www.maccallgrind.com/>MacCallGrind</a>.<figure><img src=/posts/python-profiling/kcachegrind.png alt=KCachegrind></figure><p>We will be dividing this post into two main categories:<ul><li>writing simple web-service,<li>visualize profile of this web-service.</ul><h2 id=simple-web-service>Simple web-service</h2><p>Let's use virtualenv so we won't pollute our base system. If you don't have
virtualenv installed on your system you can install it with pip command.<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span><span style=color:green># let's install virtualenv globally</span>
</span></span><span style=display:flex><span>$ sudo pip install virtualenv
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># let's also install pyprof2calltree globally</span>
</span></span><span style=display:flex><span>$ sudo pip install pyprof2calltree
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># now we create project</span>
</span></span><span style=display:flex><span>$ mkdir demo-project
</span></span><span style=display:flex><span>$ cd demo-project/
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># now let's create folder where we will store profiles</span>
</span></span><span style=display:flex><span>$ mkdir prof
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># now we create empty virtualenv in venv/ folder</span>
</span></span><span style=display:flex><span>$ virtualenv --no-site-packages venv
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># we now need to activate virtualenv</span>
</span></span><span style=display:flex><span>$ source venv/bin/activate
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># you can check if virtualenv was correctly initialized by</span>
</span></span><span style=display:flex><span><span style=color:green># checking where your python interpreter is located</span>
</span></span><span style=display:flex><span><span style=color:green># if command bellow points to your created directory and not some</span>
</span></span><span style=display:flex><span><span style=color:green># system dir like /usr/bin/python then everything is fine</span>
</span></span><span style=display:flex><span>$ which python
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># we can check now if all is good ➜ if ok couple of</span>
</span></span><span style=display:flex><span><span style=color:green># lines will be displayed</span>
</span></span><span style=display:flex><span>$ pip freeze
</span></span><span style=display:flex><span><span style=color:green># appdirs==1.4.3</span>
</span></span><span style=display:flex><span><span style=color:green># packaging==16.8</span>
</span></span><span style=display:flex><span><span style=color:green># pyparsing==2.2.0</span>
</span></span><span style=display:flex><span><span style=color:green># six==1.10.0</span>
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># now we are ready to install bottlepy ➜ web micro-framework</span>
</span></span><span style=display:flex><span>$ pip install bottle
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># you can deactivate virtualenv but you will then go</span>
</span></span><span style=display:flex><span><span style=color:green># under system domain ➜ for now don't deactivate</span>
</span></span><span style=display:flex><span>$ deactivate
</span></span></code></pre><p>We are now ready to write simple web service. Let's create file app.py and paste
code bellow in this newly created file.<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span><span style=color:green># -*- coding: utf-8 -*-</span>
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:#00f>import</span> bottle
</span></span><span style=display:flex><span><span style=color:#00f>import</span> random
</span></span><span style=display:flex><span><span style=color:#00f>import</span> cProfile
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span>app = bottle.Bottle()
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># this function is a decorator and encapsulates function</span>
</span></span><span style=display:flex><span><span style=color:green># and performs profiling and then saves it to subfolder</span>
</span></span><span style=display:flex><span><span style=color:green># prof/function-name.prof</span>
</span></span><span style=display:flex><span><span style=color:green># in our example only awesome_random_number function will</span>
</span></span><span style=display:flex><span><span style=color:green># be profiled because it has do_cprofile defined</span>
</span></span><span style=display:flex><span><span style=color:#00f>def</span> do_cprofile(func):
</span></span><span style=display:flex><span> <span style=color:#00f>def</span> profiled_func(*args, **kwargs):
</span></span><span style=display:flex><span> profile = cProfile.Profile()
</span></span><span style=display:flex><span> <span style=color:#00f>try</span>:
</span></span><span style=display:flex><span> profile.enable()
</span></span><span style=display:flex><span> result = func(*args, **kwargs)
</span></span><span style=display:flex><span> profile.disable()
</span></span><span style=display:flex><span> <span style=color:#00f>return</span> result
</span></span><span style=display:flex><span> <span style=color:#00f>finally</span>:
</span></span><span style=display:flex><span> profile.dump_stats(<span style=color:#a31515>"prof/"</span> + str(func.__name__) + <span style=color:#a31515>".prof"</span>)
</span></span><span style=display:flex><span> <span style=color:#00f>return</span> profiled_func
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># we use profiling over specific function with including</span>
</span></span><span style=display:flex><span><span style=color:green># @do_cprofile above function declaration</span>
</span></span><span style=display:flex><span>@app.route(<span style=color:#a31515>"/"</span>)
</span></span><span style=display:flex><span>@do_cprofile
</span></span><span style=display:flex><span><span style=color:#00f>def</span> awesome_random_number():
</span></span><span style=display:flex><span> awesome_random_number = random.randint(0, 100)
</span></span><span style=display:flex><span> <span style=color:#00f>return</span> <span style=color:#a31515>"awesome random number is "</span> + str(awesome_random_number)
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span>@app.route(<span style=color:#a31515>"/test"</span>)
</span></span><span style=display:flex><span><span style=color:#00f>def</span> test():
</span></span><span style=display:flex><span> <span style=color:#00f>return</span> <span style=color:#a31515>"dummy test"</span>
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:#00f>if</span> __name__ == <span style=color:#a31515>'__main__'</span>:
</span></span><span style=display:flex><span> bottle.run(
</span></span><span style=display:flex><span> app = app,
</span></span><span style=display:flex><span> host = <span style=color:#a31515>"0.0.0.0"</span>,
</span></span><span style=display:flex><span> port = 4000
</span></span><span style=display:flex><span> )
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># run with 'python app.py'</span>
</span></span><span style=display:flex><span><span style=color:green># open browser 'http://0.0.0.0:4000'</span>
</span></span></code></pre><p>When browser hits awesome_random_number() function profile is created in prof/
subfolder.<h2 id=visualize-profile>Visualize profile</h2><p>Now let's create callgrind format from this cProfile output.<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span>$ cd prof/
</span></span><span style=display:flex><span>$ pyprof2calltree -i awesome_random_number.prof
</span></span><span style=display:flex><span><span style=color:green># this creates 'awesome_random_number.prof.log' file in the same folder</span>
</span></span></code></pre><p>This file can be opened with visualizing tools listed above. In this case we
will be using Profilling Viewer under MacOS. You can open image in new tab. As
you can see from this example there is hierarchy of execution order of your
code.<figure><img src=/posts/python-profiling/profiling-viewer.png alt="Profilling Viewer"></figure><blockquote><p>Make sure you convert output of the cProfile output every time you want to
refresh and take a look at your possible optimizations because cProfile updates
.prof file every time browser hits the function.</blockquote><p>This is just a simple example but when you are developing real-life applications
this can be very illuminating, especially to see which parts of your code are
bottlenecks and need to be optimized.<h2 id=update-2017-04-22>Update 2017-04-22</h2><p>Reddit user <a href=https://www.reddit.com/user/mvt>mvt</a> also recommended this awesome
web based profile visualizer <a href=https://jiffyclub.github.io/snakeviz/>SnakeViz</a>
that directly takes output from
<a href=https://docs.python.org/2/library/profile.html#module-cProfile>cProfile</a>
module.<div class=reddit-embed data-embed-media=www.redditmedia.com data-embed-parent=false data-embed-live=false data-embed-uuid=583880c1-002e-41ed-a373-020a0ef2cff9 data-embed-created=2017-04-22T19:46:54.810Z><a href=https://www.reddit.com/r/Python/comments/66v373/profiling_python_web_applications_with_visual/dgljhsb/>Comment</a> from discussion <a href=https://www.reddit.com/r/Python/comments/66v373/profiling_python_web_applications_with_visual/>Profiling Python web applications with visual tools</a>.</div><script async src=https://www.redditstatic.com/comment-embed.js></script><pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span><span style=color:green># let's install it globally as well</span>
</span></span><span style=display:flex><span>$ sudo pip install snakeviz
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># now let's visualize</span>
</span></span><span style=display:flex><span>$ cd prof/
</span></span><span style=display:flex><span>$ snakeviz awesome_random_number.prof
</span></span><span style=display:flex><span><span style=color:green># this automatically opens browser window and</span>
</span></span><span style=display:flex><span><span style=color:green># shows visualized profile</span>
</span></span></code></pre><figure><img src=/posts/python-profiling/snakeviz.png alt=SnakeViz></figure><p>Reddit user <a href=https://www.reddit.com/user/ccharles>ccharles</a> suggested a better
way for installing pip software by targeting user level instead of using sudo.<div class=reddit-embed data-embed-media=www.redditmedia.com data-embed-parent=false data-embed-live=false data-embed-uuid=f4f0459e-684d-441e-bebe-eb49b2f0a31d data-embed-created=2017-04-22T19:46:10.874Z><a href=https://www.reddit.com/r/Python/comments/66v373/profiling_python_web_applications_with_visual/dglpzkx/>Comment</a> from discussion <a href=https://www.reddit.com/r/Python/comments/66v373/profiling_python_web_applications_with_visual/>Profiling Python web applications with visual tools</a>.</div><script async src=https://www.redditstatic.com/comment-embed.js></script><pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span><span style=color:green># now we need to add this path to our $PATH variable</span>
</span></span><span style=display:flex><span><span style=color:green># we do this my adding this line at the end of your</span>
</span></span><span style=display:flex><span><span style=color:green># ~/.bashrc file</span>
</span></span><span style=display:flex><span>PATH=$PATH:$HOME/.local/bin/
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># in order to use this new configuration you can close</span>
</span></span><span style=display:flex><span><span style=color:green># and reopen terminal or reload .bashrc file</span>
</span></span><span style=display:flex><span>$ source ~/.bashrc
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># now let's test if new directory is present in $PATH</span>
</span></span><span style=display:flex><span>$ echo $PATH
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span><span style=color:green># now we can install on user level by adding --user</span>
</span></span><span style=display:flex><span><span style=color:green># without use of sudo</span>
</span></span><span style=display:flex><span>$ pip install snakeviz --user
</span></span></code></pre><p>Or as suggested by <a href=https://www.reddit.com/user/mvt>mvt</a> you can
use <a href=https://github.com/mitsuhiko/pipsi>pipsi</a>.</div></article></main><section><hr><h2>Posts from blogs I follow around the net</h2><ul><li><a href=https://utcc.utoronto.ca/~cks/space/blog/solaris/ZFSWhyNotDirectoryToFilesystem target=_blank rel=noopener>One reason that ZFS can't turn a directory into a filesystem</a> — <a href=https://utcc.utoronto.ca/~cks/space/blog/>Chris's Wiki :: blog</a><div>One of the wishes that I and other people frequently have for ZFS
is the ability to take an existing directory (and everything
underneath it) in a ZFS filesystem and turn it into a sub-filesystem
of its own. One reason for wanting this is that a number of things
are set and controlled on a per-filesyst…<li><a href=http://www.landley.net/notes-2023.html#28-10-2023 target=_blank rel=noopener>October 28, 2023</a> — <a href=http://www.landley.net/notes-2023.html>Rob Landley's Blog Thing for 2023</a><div>Oh good grief, two of my least favorite licensing people, Larry Rosen
and Bradley Kuhn, are interacting on the OSI's license-discuss
list where the're doing
bad computer history and insisting that a guy Larry Rosen
coincidentally interviewed for a book years ago is clearly the origin of
somethin…<li><a href="http://offbeatpursuit.com:80/blog/?id=25" target=_blank rel=noopener>A fix by any other name</a> — <a href=http://offbeatpursuit.com:80/blog/>WLOG - blog</a><div>tags:
i2c, plan9
Another month, another file system.
Well, if you can’t fix it in software, fix it in hardware (looking at
you, bme680, we’re not
done yet). The show must go on, as they say, and I would like my
experiments to go on.
So a “new” addition to the environmental sensor family connected to
the h…<li><a href=https://mirzapandzo.com/next-image-url-parameter-is-valid-but-upstream-response-is-invalid target=_blank rel=noopener>Next/Image "url" parameter is valid but upstream response is invalid</a> — <a href=https://mirzapandzo.com/>Mirza Pandzo's Blog</a><div>Getting "url" parameter is valid but upstream response is invalid error with Next/Image on WSL2<li><a href=https://drewdevault.com/2023/10/13/Going-off-script.html target=_blank rel=noopener>Going off-script</a> — <a href=https://drewdevault.com>Drew DeVault's blog</a><div>There is a phenomenon in society which I find quite bizarre. Upon our entry to
this mortal coil, we are endowed with self-awareness, agency, and free will.
Each of the 8 billion members of this human race represents a unique person, a
unique worldview, and a unique agency. Yet, many of us have the sam…<li><a href=https://szymonkaliski.com/writing/2023-10-02-building-a-diy-pen-plotter/ target=_blank rel=noopener>Building a DIY Pen Plotter</a> — <a href=http://github.com/dylang/node-rss>Szymon Kaliski</a><div>This article documents my learnings from designing and building a DIY Pen Plotter during the summer of 2023.
My ultimate goal is to build my…<li><a href=https://neil.computer/notes/chart-of-accounts-for-startups-and-saas-companies/ target=_blank rel=noopener>Chart of Accounts for Startups and SaaS Companies</a> — <a href=https://neil.computer/>Neil Panchal</a><div>Accounting is fundamental to starting a business. You need to have a basic understanding of accounting principles and essential bookkeeping. I had to learn it. There was no choice. For filing taxes, your CPA is going to ask you for an Income Statement (also known as P/L statement). If<li><a href=https://journal.valeriansaliou.name/deploy-a-nomad-cluster-on-alpine-linux-with-vultr/ target=_blank rel=noopener>Deploy a Nomad Cluster on Alpine Linux with Vultr</a> — <a href=https://journal.valeriansaliou.name/>Valerian Saliou</a><div>After spending countless hours trying to understand how to deploy my apps on Kubernetes for the first time to host Mirage, an AI API service that I run, I ended up making myself a promise that the next app I work on would be using a more productive & simpler<li><a href=https://jcs.org/2023/10/25/wifi_da target=_blank rel=noopener>BlueSCSI Wi-Fi Desk Accessory 1.0 Released</a> — <a href=https://jcs.org/>joshua stein</a><div>BlueSCSI Wi-Fi Desk Accessory
1.0 has been released:
wifi_da-1.0.sit
(StuffIt 3 archive)
SHA256: ccfc9d27dd5da7412d10cef73b81119a1fec3848e4d1d88ff652a07ffdc6a69aSHA1: ff124972f202ceda6d7fa4788110a67ccda6a13a
This is the initial public release of my BlueSCSI Wi-Fi Desk Accessory for
classic MacOS.<li><a href=https://michael.stapelberg.ch/posts/2023-10-25-my-all-flash-zfs-network-storage-build/ target=_blank rel=noopener>My 2023 all-flash ZFS NAS (Network Storage) build</a> — <a href=https://michael.stapelberg.ch/>Michael Stapelbergs Website</a><div>For over 10 years now, I run two self-built NAS (Network Storage) devices which serve media (currently via Jellyfin) and run daily backups of all my PCs and servers.
In this article, I describe my goals, which hardware I picked for my new build (and why) and how I set it up.
Design Goals
I use my netw…</ul><p>Generated with <a href=https://git.sr.ht/~sircmpwn/openring target=_blank rel=noopener>openring</a>.</section><footer><hr><p><big><strong>Want to comment or have something to add?</strong></big><p>You can write me an email
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