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Add spaces and reduce text in formulas to help readability, update CPU instructions

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Michael Robinson
2019-03-19 16:56:55 +00:00
parent 3baab69baa
commit 95733022ad
1 changed files with 11 additions and 8 deletions
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19
docs/howto/admin/resource-estimation.rst
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@@ -16,7 +16,8 @@ installations.
.. math::
Server Memory Recommended = (Maximum concurrent users \times Maximum memory allowed per user) + 128MB
Recommended\, Memory =
(Max\, concurrent\, users \times Max\, mem\, per\, user) + 128MB
The ``128MB`` is overhead for TLJH and related services. **Server Memory Recommended**
@@ -27,7 +28,7 @@ Maximum concurrent users
------------------------
Even if your class has 100 students, most of them will not be using the JupyterHub
actively at an given moment. At 2am on a normal night, maybe you'll have 10 students
actively at a single given moment. At 2am on a normal night, maybe you'll have 10 students
using it. At 2am before a final, maybe you'll have 60 students using it. Maybe
you'll have a lab session with all 100 of your students using it at the same time.
@@ -38,7 +39,7 @@ over time. We generally recommend between 40-60% of your total class size to sta
Maximum memory allowed per user
-------------------------------
Depending on what kinda work your users are doing, they will use different amounts
Depending on what kind of work your users are doing, they will use different amounts
of memory. The easiest way to determine this is to run through a typical user
workflow yourself, and measure how much memory is used. You can use :ref:`howto/admin/nbresuse`
to determine how much memory your user is using.
@@ -47,7 +48,7 @@ A good rule of thumb is to take the maximum amount of memory you used during
your session, and add 20-40% headroom for users to 'play around'. This is the
maximum amount of memory that should be given to each user.
If users use *more* than this alloted amount of memory, their notebook kernel will restart.
If users use *more* than this alloted amount of memory, their notebook kernel will *restart*.
CPU
===
@@ -58,11 +59,13 @@ stop, unlike with RAM.
.. math::
Server CPU Recommended = (Maximum concurrent users \times Maximum CPU usage per user) + 0.2
Recommended\, CPU = (Max\, concurrent\, users \times Max\, CPU\, usage\, per\, user) + 20\%
The ``0.2`` is overhead for TLJH and related services. **Server CPU Recommended**
is the amount of CPU the server you acquire should have. We recommend using
The ``20%`` is overhead for TLJH and related services. This is around 20% of a
single modern CPU. This of course is just an estimate. We recommend using
the same process used to estimate Memory required for estimating CPU required.
You cannot use nbresuse for this, but you should carry out normal workflow and
investigate the CPU usage on the machine.
Disk space
==========
@@ -72,7 +75,7 @@ rather than **maximum concurrent** users.
.. math::
Server Disk Size Recommended = (Total \times Maximum disk usage per user) + 2GB
Recommended\, Disk\, Size = (Total\, users \times Max\, disk\, usage\, per\, user) + 2GB
Resizing your server
====================