[BuildStream] Weekly performance update for the Debian-like project

[James Ennis <james ennis codethink co uk>]

Hello,

As before, a notebook containing *all* of the results should be 
available via following link:

https://mybinder.org/v2/gh/james-ennis/bst-benchmarks-notebooks/master?filepath=all_results.ipynb

If the link has expired, you'll need to go to https://mybinder.org/ and 
the copy and paste: 
https://github.com/james-ennis/bst-benchmarks-notebooks into the url 
field, with branch "master" and file "all_results.ipynb". Then "launch".

When the notebook has loaded please click on "Kernel" -> "Restart and 
Run all".

This will show the four interactive graphs and some instructions 
regarding how the toolbar can be used to interact with each graph.

-----

All results were obtained on the same hardware (a Codethink dev machine 
configured to be a gitlab runner - not being used for anything else), 
and the results files are being appended to by a CI job. Specs as 
follows:

* Linux (Debian stable)
* x86_64
* 16G RAM
* 500Gb SSD
* Intel i7-3770
* 8 cores @ 3.40 GHz

-----

Here are the times and max-rss (peak memory usage) results for a `bst 
show` of base-files/base-files.bst in the Debian-like project [0] 
(jennis/use_remote_file branch [1]) for the last 5 weeks:

┌─────┬─────────────────┬─────────────────┬───────────────────────────┐
│     │      Show       │ YAML cache show │      Show once built      │
├─────┼───────┬─────────┼───────┬─────────┼─────────────────┬─────────┤
│Dates│Time   │Memory   │Time   │Memory   │Show once built  │Memory   │
│     │(s)    │(M)      │(s)    │(M)      │(s)              │(M)      │
├─────┼───────┼─────────┼───────┼─────────┼─────────────────┼─────────┤
│03/25│22.63  │422      │13.40  │433      │17.36            │563      │
│03/31│       │         │       │         │                 │         │
├─────┼───────┼─────────┼───────┼─────────┼─────────────────┼─────────┤
│04/01│11.32  │352      │11.17  │352      │12.96            │470      │
│04/07│       │         │       │         │                 │         │
├─────┼───────┼─────────┼───────┼─────────┼─────────────────┼─────────┤
│04/08│11.27  │352      │11.13  │352      │13.08            │470      │
│04/14│       │         │       │         │                 │         │
├─────┼───────┼─────────┼───────┼─────────┼─────────────────┼─────────┤
│04/15│11.29  │351      │11.23  │352      │12.97            │470      │
│04/21│       │         │       │         │                 │         │
├─────┼───────┼─────────┼───────┼─────────┼─────────────────┼─────────┤
│04/22│11.50  │259      │11.44  │259      │13.21            │314      │
│04/28│       │         │       │         │                 │         │
└─────┴───────┴─────────┴───────┴─────────┴─────────────────┴─────────┘

-----

Here are the times and max-rss results for a `bst build` (4, 8 and 12 
builders) of base-files/base-files.bst in the Debian-like project [1].

┌─────┬─────────────────┬─────────────────┬───────────────────────────┐
│     │   4 Builders    │   8 Builders    │        12 Builders        │
├─────┼───────┬─────────┼───────┬─────────┼─────────────────┬─────────┤
│Date │Time   │Memory   │Time   │Memory   │Show once built  │Memory   │
│     │(s)    │(M)      │(s)    │(M)      │(s)              │(M)      │
├─────┼───────┼─────────┼───────┼─────────┼─────────────────┼─────────┤
│01/14│1383.67│1119     │1078.76│1119     │735.41           │1119     │
│01/20│       │         │       │         │                 │         │
├─────┼───────┼─────────┼───────┼─────────┼─────────────────┼─────────┤
│03/25│286.67 │435      │302.77 │435      │332.87           │435      │
│03/31│       │         │       │         │                 │         │
├─────┼───────┼─────────┼───────┼─────────┼─────────────────┼─────────┤
│04/01│249.50 │355      │255.38 │355      │284.80           │355      │
│04/07│       │         │       │         │                 │         │
├─────┼───────┼─────────┼───────┼─────────┼─────────────────┼─────────┤
│04/08│233.83 │354      │249.45 │354      │267.39           │354      │
│04/14│       │         │       │         │                 │         │
├─────┼───────┼─────────┼───────┼─────────┼─────────────────┼─────────┤
│04/22│187.29 │262      │207.31 │262      │226.77           │262      │
│04/28│       │         │       │         │                 │         │
└─────┴───────┴─────────┴───────┴─────────┴─────────────────┴─────────┘


Please see [2] if you're unable to open the weekly notebook.

Thanks,
James

[0] https://gitlab.com/jennis/debian-stretch-bst
[1] 
https://gitlab.com/jennis/debian-stretch-bst/tree/jennis/use_remote_file
[2] 
https://mail.gnome.org/archives/buildstream-list/2019-February/msg00046.html