[BuildStream] Weekly performance update

[Tom Pollard <tom pollard codethink co uk>]

Hi all,

It's my turn to garden the weekly performance results, so hopefully I've
not let James down :)

---

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

Don't forget to run "Kernel" -> "Restart and Run all" to actually
generate the graphs.

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

---

All results were obtained on the same hardware (a Codethink dev
machine configured as 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 stretch)
* 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 (branch:
jennis/add_all_files [1]) for the last 5 weeks:

┌─────────┬─────────────────┬─────────────────┐
│         │      Show       │ Show once built │
├─────────┼───────┬─────────┼───────┬─────────┤
│Dates    │Time   │Memory   │Time   │Memory   │
│         │(s)    │(M)      │(s)    │(M)      │
├─────────┼───────┼─────────┼───────┼─────────┤
│29/07 -> │6.58   │201      │6.33   │225      │
│04/08    │       │         │       │         │
├─────────┼───────┼─────────┼───────┼─────────┤
│05/08 -> │6.57   │201      │6.79   │226      │
│11/08    │       │         │       │         │
├─────────┼───────┼─────────┼───────┼─────────┤
│12/08 -> │6.58   │201      │6.77   │226      │
│18/08    │       │         │       │         │
├─────────┼───────┼─────────┼───────┼─────────┤
│19/08 -> │6.29   │199      │6.55   │229      │
│25/08    │       │         │       │         │
├─────────┼───────┼─────────┼───────┼─────────┤
│26/08 -> │6.45   │200      │6.67   │229      │
│01/09    │       │         │       │         │
└─────────┴───────┴─────────┴───────┴─────────┘

---

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
(branch: jennis/add_all_files [1]).

┌─────────┬─────────────────┬─────────────────┬──────────────────┐
│         │   4 Builders    │   8 Builders    │   12 Builders    │
├─────────┼───────┬─────────┼───────┬─────────┼───────┬──────────┤
│Date     │Time   │Memory   │Time   │Memory   │Time   │Memory    │
│         │(s)    │(M)      │(s)    │(M)      │(s)    │(M)       │
├─────────┼───────┼─────────┼───────┼─────────┼───────┼──────────┤
│29/07 -> │130.06 │223      │133.03 │224      │129.37 │224       │
│04/08    │       │         │       │         │       │          │
├─────────┼───────┼─────────┼───────┼─────────┼───────┼──────────┤
│05/08 -> │129.05 │223      │134.05 │224      │129.83 │224       │
│11/08    │       │         │       │         │       │          │
├─────────┼───────┼─────────┼───────┼─────────┼───────┼──────────│
│12/08 -> │134.24 │223      │135.14 │224      │132.45 │224       │
│18/08    │       │         │       │         │       │          │
├─────────┼───────┼─────────┼───────┼─────────┼───────┼──────────┤
│19/08 -> │131.38 │226      │133.26 │226      │134.09 │226       │
│25/08    │       │         │       │         │       │          │
├─────────┼───────┼─────────┼───────┼─────────┼───────┼──────────┤
│26/08 -> │130.07 │226      │131.94 │227      │133.23 │224       │
│01/09    │       │         │       │         │       │          │
└─────────┴───────┴─────────┴───────┴─────────┴───────┴──────────┘

---

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

Thanks,
Tom Pollard

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