UBC derived configuration examples

2008-03-01T21:54:25Z

Isavcic: Fixed a typo: MB -> KB

{{UBC toc}}

This table shows examples of configurations derived from the [[UBC configuration examples|basic examples]].

== Derived UBC configurations ==
{| class="wikitable"
! Name !! A !! B !! 2A !! 0.5A+0.5B
|-
! Power || 1GB/200 || 1GB/60 || 1GB/100 || 1GB/92
|-
! colspan="5" | Helper values
|-
|total mem || 4986KB || 16000KB || 9972KB || 10493KB
|-
|total kmem || 1536KB || 3712KB || 3072KB || 2624KB
|-
|total umem || 3450KB || 12288KB || 6900KB || 7869KB
|-
|avnumproc || 15 || 40 || 30 || 27
|-
! colspan="5" | Primary parameters
|-
|numproc || 40 || 65 || 80 || 52
|-
|numtcpsock || 40 || 80 || 80 || 60
|-
|numothersock || 40 || 80 || 80 || 60
|-
! colspan="5" | Secondary parameters
|-
|kmemsize || 851,968 || 2,359,296 || 1,703,936 || 1,605,632
|-
|tcpsndbuf || 262,144 || 524,288 || 524,288 || 393,216
|-
|tcprcvbuf || 262,144 || 524,288 || 524,288 || 393,216
|-
|othersockbuf || 163,840 || 327,680 || 327,680 || 245,760
|-
|dgramrcvbuf || 32,768 || 65,536 || 65,536 || 49,152
|-
! colspan="5" | Auxiliary parameters
|-
|shmpages || 512 || 1,024 || 1,024 || 768
|-
|privvmpages || 3,450 || 9,216 || 6,900 || 6,333
|-
|numfile || 512 || 1,280 || 1,024 || 896
|-
|dcachesize || 196,608 || 524,288 || 393,216 || 360,448
|}

== Explanation ==

The columns A and B are exactly the already considered [[UBC configuration examples|examples A and B]].

=== 2A ===
The next column labelled “2A” was produced by multiplying all the numbers
from [[UBC configuration examples#Example A|example A]] by 2. This configuration is good for half the number of
Virtual Environments plan A was created for, that is, this new configuration
is for 100 Virtual Environments on a system with 1GB of RAM.

=== 0.5A+0.5B ===
The next column “0.5A+0.5B” was produced by multiplying the numbers
from [[UBC configuration examples#Example A|example A]] by 0.5 and adding the numbers from [[UBC configuration examples#Example B|example B]] multiplied
by 0.5. The resulting confguration is a mean confguration between A and
B, being computed as (A + B)/2. It is good for

<math>\frac{1}{0.5/200+0.5/60} \approx 92</math>

Virtual Environments on a system with 1GB of RAM.

== Other configurations ==
A lot of other configurations can be produced the same way, by multiplying
by a constant (and summing, if necessary) the values from existing configurations.

Configurations produced by multiplying existing configurations
by a number greater than 1 will be consistent if the original configurations
were consistent. Configurations produced by multiplying by a number less
than 1 may or may not be consistent. See [[Intermediate UBC configurations]] for more details
about producing new configurations basing on the existing ones.

'''Caution''': do not subtract the values of one configuration from others.

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UBC derived configuration examples