1 What Guerrilla graduates are saying
- Ben House — DevOps Engineer, DNC (2021):
Guerrilla Capacity and Performance (GCAP) class
over the past two weeks.
Finally have a framework to apply Little's Law,
the Universal Scalability Law, and queuing theory.
More tools in the toolbox and a tactical way to use them!
- Sharath Sivakumar — Rakuten, India (2021):
Graduated from the Guerrilla
Boot Camp (GBOOT) class online and also got started on the Guerrilla
capacity planning book. Thank you Neil Gunther for the amazing
exceptional insights on virtualization and queueing theory.
- Muhammad Azad — Microsoft (2021):
I highly recommend Dr. Gunther's training for practitioners who are
looking to develop an intuitive yet profoundly insightful and
Little's Law and queuing
theory. It'll give you a superpower that'll last for the rest of
- Wassim Dhib — LeadWire, France (2020):
I now apply the USL (Universal
whenever the opportunity arises. It really changed my way of doing
- Rob Franolic — DinerBytes, UK (2020):
Neil has a great deal of experience, and he offers unique perspectives
on performance and capacity planning. I attended his
PDQW workshop online and gained a good understanding of queuing
theory and how it applies to all
computing systems. Using his PDQ toolkit we learnt how to quickly get
more fundamental understanding of the performance of any system.
- Annie F. — Intel Corp. (2020):
Dr Gunther answered questions that had haunted me for years. He
enabled a visceral understanding of systems behavior with sufficient
mathematics. Not too much, not too little. I have been practicing
systems performance analysis for 20 years, and the knowledge and
understanding I gained from him is the booster fuel that takes me to a
next level of the craft.
For those of you who love systems but are mathematically handicapped,
take this class.
For those of you asking such deep questions as, "Why can most systems
be modeled with a Poisson distribution?" and, "What inner natural
process makes them random?", take this class.
For those of you hitting a mid-career crisis on queuing theory (but
know enough to know that you don’t know enough), take this class.
I am thankful for the opportunity to learn from him. I cannot wait to
apply everything I have learnt.
- Rodrigo Nascimento — NetApp (2019):
Completed the Online
Capacity and Performance training with @DrQz.
I’ve learned so much about queueing
theory and Little’s Law, and the Universal
Scalability Law frameworks in past two weeks, it's totally
changed the way I look at performance data.
- Ruslan Rusu — ClearMe.com, USA (2019):
Blown away by queueing
theory and PDQ. You get instant feedback for topology and
optimization changes. It will help you discard bad ideas before
writing the code.
I even made "PDQtoGo"
to make it more accessible.
- Rudy Gevaert — Universiteit Gent, Belgium (2018):
Dr. Gunther has tons of experience and during his GCAP
class he shares it freely. He takes you on a long journey,
filled with queueing models, under bridges of concave USL graphs and
mountains of exponential functions. Nonetheless, he never loses sight
of applicability as the destination. Dr. Gunther also takes the time
to make sure you fully understand the
topics discussed. His storytelling is unique, which means you will
more than what you signed up for. He makes sure he finds the right
angle to get
the message across. The slides and accompanying books are excellent
works that should be on the shelf of any system administrator. As well
a formal teacher, Dr. Gunther is also a welcoming host who goes the
extra mile for his students.
- Mohit Chawla — Germany (2017):
It was gratifying to learn about the tools and techniques of data
visualisation for performance analysis in GDAT
class, more so when understood in
the context of the capacity planning concepts taught in GCAP
I also liked the way those two classes came together; especially the
insight that although
real computer systems have correlations, those correlations are often
therefore we can happily apply the exponential distribution as assumed
Dr. Gunther also knows about the secret behind the success of Edwin
Hubble (more than a scatterplot) and Gregor
Mendel (more than the 30,000 experiments), which lies outside
pure science. Find out more in the classes!
- Jeff Pickett — Covance (2016):
If you are involved with performance monitoring, analyzing
planning, and performance prediction, I highly recommend any of these
If you are serious about performance and capacity management, then you
equipped with everything you need (and much more) to thrive in all
performance and provide enterprise and business value.
- Joe Williams — GitHub (2015):
I really enjoyed participating in the GCAP
class, it was very helpful to get hands on with the techniques I
had previously read about. While it took me a few
years to find an employer that would send me to the class it was well
wait. Neil is a thoughtful instructor and I hope to take the GDAT
class at some
point. He also happens to pick great lunch spots during the week.
- Mimi Parsons — Expedia (2014):
Excellent training, well organized. Large amount of material was
presented in an understandable format. Dr Gunther found ways of
abstract concepts in a simple way, providing best conceptual
- Mike Brunt — CFWhisperer.com (2013):
After 15 years in server performance-tuning; I learned more in 5 days.
- Mark Cwetna — Schwab (2013):
It was a profound honor to attend your Guerrilla
Data Analysis Techniques (GDAT) class this past week. I
can't think of enough accolades to describe your
level of commitment to education, your in-depth knowledge of
technologies, analysis techniques and your infectious desire to
in every word/idea. In my lifetime you are one of the rarest
educators that I've ever had the good fortune to have
experienced. I now have
the confidence, tools and educational prowess to go forth and spread
word. From the depths of my being I offer you my profound
gratitude for sharing
your knowledge with me. I will do my best to honor you and the
capacity and performance to the best of my abilities.
- Maulan Byron — Comcast (2013):
class is frankly the best performance class I have attended. The
first 2 days alone were worth the price of admission. It was focussed
detailed with very relevant examples. I'll be back for the GData
- Joshua Jin — Database Architect (2012):
Capacity Planning (GCAP) class is a fantastic class. Dr. Gunther
unique ability explaining the complex Queuing theory in such way that
we all can
comprehend without much difficulties. He taught the class with
attending the training, I feel that his book contents are much easier
To enhance the learning, Dr. Gunther demonstrated using Queuing
solving PDQ problems in R. For IT capacity professionals, this
you with knowledge, insight, and tools to be successful. It is
- Arun Kejariwal — Netflix (2012):
I enrolled to Neil's Guerrilla
Data Analysis (GDAT) class based on the recommendation of my
colleagues at work. The discussion about USL
apply to various scenarios was insightful. The discussion about
Guftanson Trend and how it
compares to Amdahl's
was interesting. Last but not the least, I learned about new ways of data
visualization. The fact that Neil shares his scripts is a big
- Greg Rogers — Schwab (2011):
The fractal analysis of ORACLE query times in the Guerrilla
Data Analytics (GDAT) class was awesome. It, along with
Principal Components Analysis and Machine Learning, were worth the
price of admission!
- Gary Little — NetApp (2011):
Putting together a trip report about recent GBOOT
training. I'd forgotten how enjoyable it was. Thanks @DrQz
[You're welcome. 1 —njg
- Asa Hendrick — SunTrust Bank (2011):
If your looking for training that will challenge your presumptions and
you to think in new ways, Guerrilla
Capacity Planning (GCAP) is an excellent choice.
In short, Dr. Gunther provided an excellent foundation and a new
that will improve my effectiveness as a Capacity and Performance
- Thyya Ung — CoreLogic (2011):
It was an eye opening learning experience taking your class.
- Glenn Lockwood — U.S. Cellular (2010):
I especially enjoyed the first-hand war stories that make the GDAT
come alive. The progression of topics was brilliant. I found myself
pondering questions about digital filters and neural nets as analysis
tools only to find the topics covered subsequently. Even the coverage
significant digits and rounding applies to current problems I am asked
to provide leadership and guidance on as a software engineer.
- Henry Colonna — Quest Diagnostics (2010):
Having taken your Guerrilla
Data Analysis Techniques course I understand the beauty of
mathematics and statistics in
resolving complex capacity and performance issues. Your course
baseline in developing capacity reporting that is meanful to senior
management. Also, I have R
as a new tool in my arsenal to assist me.
- Ben Krein — AWeber.com (2010):
Recovering from a week at Guerrilla
Planning. Thanks again for the excellent and challenging class!
- Carl Davis — Oracle (2009):
The Guerrilla Capacity Planning class was by far the best technical
class I have
been to. Dr Gunther made the class interesting by telling war stories
from his many
years in the business and as a leader in the field of capacity
planning. I would
strongly advise taking this class. There is no substitute for getting
from the true expert in the field. I can't wait to put this knowledge
to practice. I
look forward to take more classes from Dr Gunther.
- Joshua Barratt — Media Temple (2009):
Even though I have over 10 years of practical experience building and
production systems, I left this class with a much deeper understanding
fundamentally, to analyze questions of performance, scale, and
capacity. I got some
practical skills that I was able to apply during the week of the class
well as a good introduction to a family of tools (like PDQ and R)
they'll take some time to master, are already proving useful.
- Bryan Le — IBM (2009):
This course was outstanding. i really like the way he laid out the
concepts and gave examples of how to apply the concepts from his own
consultant experiences. I also like the model approach to performance
management and capacity planning.
- Greg Smyth — Facebook (2009):
Great course, I'll never look at certain
graphs in the same way again!
- Mark Monaghan — Terraprova (2009):
When I am rummaging about in the bowels of systems, in a never ending
test/measure/tweak/tear at my few remaining hairs cycle in pursuit of
maximum performance, it is difficult to remember that a view from a
further back might be in order. The GCaP
class was refreshingly
practical and presented techniques and concepts that will be useful in
determining where to focus my efforts and provide clients and
with information that can be readily grasped by all but the densest
nudniks. And let us not forget the Universal
This in itself is worth the price of admission. Throw in the never
of calories and the very relevant anecdotes and what you have is an
informative and enjoyable week that far surpasses any other industry
class I have attended.
- Joe Lenart — AETNA (2009):
I thought your Guerrilla
Planning class was highly insightful and full of great
techniques that I can apply immediately within my occupation as a
Planner. Your real-life examples and anecdotes have not only awakened
my mind to
what to look for in situations that may be crucial in quickly
capacity-related problems, but they were entertaining enough that I
the benefit of your experience will stick with me for a long time to
Your simplified, yet mathematically accurate equations (as you proved
in class) were much easier to understand and apply to real workplace
situations than much of the Ph.D thesis-level examples in other books.
result they are tools that will help me improve my understanding of
architectures and to better support them in short order.
I have already talked to my management about coming back for your
course, and have also spoken to the manager of our Performance Lab, as
believe the techniques that you outline will be useful in helping my
to work with them to design better application performance tests.
Thanks for your time and insights. I look forward to attending
Capacity Planning—The Sequel.
- Stefan Parvu — Sun Microsystems/Nokia, Finland (2008):
is highly recommended to any System Administrator or
System Service management personnel. Finally there is a class not
about a software
product in particular but about concepts and methodologies of what is
Performance Analysis and Capacity Planning. Simple applied to
economy the GCaP is a must for anyone involved in Capacity Planning
Performance Analysis. GCaP served me as an example in building System
Data Recorder, a proof of concept around GCaP, which helps you look to
your data center: analyzing certain workloads, consolidate where is
the case, ultimate saving energy.
- Vladimir Begun — Oracle (2008):
"We are the champions, ...." [quoting the Queen song in the context of
Go forth and Kong-ka!].
Seriously, it (Guerrilla
Boot Camp) was great! I really like how you approach the issues;
simplicity but not
over-simplification. The examples from your own experience are real
the "crown" of the class. You know one cannot learn how to manage
from a person who never managed a company and achieved something.
That's why I picked your class. When one wants to
learn something he should go not just for the information but from the
person as well. Very good atmosphere, a clear and horizon-expanding
presentation of actual experiences in the capacity planning. About
right for a jump-start!
Eager to attend the Level II class.
- Tim McCluskey — Independent (2008):
Boot Camp) course was excellent! A very practical approach to
analysis, with real-world examples. Neil does an outstanding job
getting the material across with the utmost of simplicity. I recommend
this class to anyone who wants to gain the basics skills necessary for
capacity and performance management. I look forward to attending his
- Scott Roberts — UPS (2008):
Your work hits a fundamental truth; you're absolutely right in that
most capacity planning systems cost far too much and are too complex
current development and implementation cycles. Using your methods I've
developed a new capacity planning workflow using Excel and Perl::PDQ
saves a few months of work each year.
- Scott Christensen — MBA, PMP (2007):
Thank you for providing such a great class on Capacity Planning. I am
still thinking how great of a class it was. The class is by far the
class that I have had, including previous capacity planning courses.
Having previously studied physical science, the connection of modeled
to physical models proves to be very useful. Your choice of
and geographic proximity is excellent.
- Paul Puglia — Merrill Lynch (2006):
(GCAP) is one of the best courses I've taken.
- Moses Chu — Kaiser Permanente (2006):
After I come back (from the class), I have attended a 12 hours
long Data Center project through the past weekend. After the work, I
thought about the theory and practice you have shared from your past
years experience. I would call this class a total value for Capacity
planners. The experience that you shared is particular worthwhile and
eye opening. I want to thank you for hosting such a event.
- Paul Cao — Hewlett-Packard (2006):
It's one of the best training classes I ever had (it's number one on
- Henry Colonna — Quest Diagnostics (2006):
In general, it was a great course that provided a lot of information I
needed to report response time numbers. Also, It provided a lot of
information too how the capacity tool that I use works internally. I
looking forward to start to use PDQ to produce refined models and use
with my present toolset. (ps, I went to the grocery store this week
discovered that I will never look at a grocery line the same again!!)
- Allen Blackburn — IBM (2004):
I'd like to thank you again for the class. I really learned a lot! I
was so excited to get back and try out the MVRA ('noisy fingers') that
immediately started working on a script to collect the 6 different
- Stuart Plotkin — MetLife (2004):
Thanks a lot for the class, it was really great. I think it was
brilliant how your were able to zero in on key concepts and drill them
in to our heads.
- Greg Rogers — Compaq (2001):
I definitely learned performance and CP methods I'd not previously
encountered, from the Guerilla
Capacity Planning class.
- Ken Ward — Sprint (2000):
I found your 'Guerilla Capacity Planning' course to be the most
in-depth and interesting of all similar courses I've attended over the
years and, I continue to be impressed with your follow-up emails and
- Jeff and Eric — NetGain (1998):
Thank you for the great instruction. We are already applying it. In
thanks, we thought you might enjoy this book (
Goal via Amazon.com) ... it's about bottleneck indentification
and adaption in a
factory floor 2
and a bit of a love story.
- Irwin Kraus — Amdahl Corp. (1995):
Useful? Are you kidding? Your treatment is by far the clearest and
most pragmatic I have ever seen.
2 Attribution lost to the mists of time
- "Probably the most mind-expanding presentation I've seen."
- "You have a gift for visualization and presentation!"
- "I like the idea that someone in this world works with math
like Dr. Gunther does."
- "You seemed to stir up quite an interest in a topic which
most people would prefer to ignore on the grounds that it is 'too
- "What is hard to come by, is a person with both specialist
knowledge and the ability to convey it to others. You've
this uncommon combination of qualities."
- "Thanks for one of the best classes that has been presented to
- "The simplified queueing theory in itself was worth the price
1Gary might be
waxing a little too modest here. No doubt he enjoyed it, at least in part,
because he contributed
a lot to the class with some very interesting questions and
observations. Some of which I've yet to
2As much as I
deeply appreciate receiving gifts from students, I had trouble appreciating
the merits of this book. I simply cannot understand how the author can take
140 pages (out of 340) to begin explaining something as simple as the bottleneck
concept. It's the process (in manufacturing and computing) with the
longest service demand. Sorry guys.
File translated from
On 31 May 2021, 06:02.