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refactor: Use international MB instead of Mo. #8

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Oct 26, 2024
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refactor: Use international MB instead of Mo. #8

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16 changes: 8 additions & 8 deletions _posts/2024-10-26-a-faster-liquidsoap-part-deux.md
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Expand Up @@ -33,22 +33,22 @@ For reference, here's a memory consumption chart we presented before:
<tbody>
<tr>
<td><code>1.3.3</code> (docker image: <code>debian:buster</code>)</td>
<td><code>64Mo</code></td>
<td><code>64MB</code></td>
<td><code>0.091s</code></td>
</tr>
<tr>
<td><code>1.4.3</code> (docker image: <code>savonet/liquidsoap:v1.4.3</code>)</td>
<td><code>95Mo</code></td>
<td><code>95MB</code></td>
<td><code>0.163s</code></td>
</tr>
<tr>
<td><code>2.2.5</code> (docker image: <code>savonet/liquidsoap:v2.2.5</code>)</td>
<td><code>190Mo</code></td>
<td><code>190MB</code></td>
<td><code>3.879s</code></td>
</tr>
<tr>
<td><code>2.3.x</code> (docker dev image from May 9, 2024)</td>
<td><code>206Mo</code></td>
<td><code>206MB</code></td>
<td><code>5.942s</code></td>
</tr>
</tbody>
Expand Down Expand Up @@ -146,8 +146,8 @@ The more shared library your process has, the more shared memory it will be usin

![Shared Memory Illustration](https://github.com/user-attachments/assets/34bf149f-b198-42b4-a4ab-731df23a709a)

This means that, if you have `10` liquidsoap processes all using `100Mo` of memory, including the shared memory, then the total memory used on the system
is actually not `1000Mo` because a big chunk of it is shared!
This means that, if you have `10` liquidsoap processes all using `100MB` of memory, including the shared memory, then the total memory used on the system
is actually not `1000MB` because a big chunk of it is shared!

### Shared memory and docker processes?

Expand Down Expand Up @@ -217,8 +217,8 @@ Now that we've seen different elements of memory usage, how can we report memory

In linux, if you use `top` or similar tool, the most common measure of memory consumption is `RSS` for [_Resident set size_](https://en.wikipedia.org/wiki/Resident_set_size)

However, this number does include shared memory so, again, 10 processes using `30Mo` of RSS memory does not mean that a total
of `300Mo` of the system's memory is used.
However, this number does include shared memory so, again, 10 processes using `30MB` of RSS memory does not mean that a total
of `300MB` of the system's memory is used.

Also, if a program, like liquidsoap, is using a large amount of shared libraries,
the total amount of reported `RSS` memory will be large but unrelated to the memory effectively used by the application!
Expand Down
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