Editing UBC derived configuration examples

{{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 || 6900MB   ||       7869MB
|-
|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.