Stuff Michael Meeks is doing
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This is my (in)activity log. You might like to visit
Collabora
Productivity a subsidiary of Collabora focusing on LibreOffice support and
services for whom I work.
Also if you have the time to read this sort of stuff you could enlighten
yourself by going to Unraveling Wittgenstein's net or if
you are feeling objectionable perhaps here.
Failing that, there are all manner of interesting things to read on
the LibreOffice Planet news
feed.
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legacy html
- Up early, chewed mail, more gcc tweakage, improving the
debug output to find my construction vtable issue. Bug triage day -
lots of bug churn in the mail-box. Nailed the gcc issue, continued the
OO.o build.
- Poked at libical memory management with PChenthill - most
curious, and no doubt hides all manner of evils.
- Fixed a load of sillies in pagein-common, discovered with
Sankar's work, iogrind claims that this should knock about 500ms off
cold startup time, then again it claims we should cold start in 5
seconds where I see more like 20. Anyhow, a 10% win with little work
is not so bad. The extra data read is the cost of reading more than you
need, but linearly.
| task | before | after |
|---|
| pagein | 3.4sec 93Mb | 2.6sec 73Mb |
|---|
| soffice.bin | 1.2sec 10Mb | 2.7sec 23Mb |
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| total | 4.6sec 103Mb | 5.3sec 96Mb |
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So in theory a 11% win. Attempted manual cold-start timings to
check - the before/after times were 4.46sec to 4.07sec - ie. an 8.5% win
close ? not at all - subsequent runs of the 'before' case yield times
(for the same flush-all-caches, run gedit, quit, start OO.o) process of
4.4, 3.1, 2.5, 2.9, 2.7 secs. ie. totally non-deterministic as expected.
Attached some iogrind photos to the issue.
- The hidden thunks OO.o build completed & runs nicely,
good, must generate some callgrind numbers on linking cost.
- Bathed babes, dinner, back to catch up. Poked at yast2-gtk
with Coolo. Poked Alex & HPJ about GVFS locking, read a little about
webdav.
- Isolated & measured the vtreloc speedup with callgrind,
only about 10% savings in instructions, L2 cache misses etc. hmm. And
just a 4% memory saving, bother. Will focus on more memory savings
instead then.
My content in this blog and associated images / data under
images/ and data/ directories are (usually)
created by me and (unless obviously labelled otherwise) are licensed under
the public domain, and/or if that doesn't float your boat a CC0
license. I encourage linking back (of course) to help people decide for
themselves, in context, in the battle for ideas, and I love fixes /
improvements / corrections by private mail.
In case it's not painfully obvious: the reflections reflected here are my
own; mine, all mine ! and don't reflect the views of Collabora, SUSE,
Novell, The Document Foundation, Spaghetti Hurlers (International),
or anyone else.
It's also important to realise that I'm not in on the Swedish Conspiracy.
Occasionally people ask for formal photos for conferences
or fun.
Michael Meeks (michael.meeks@collabora.com)
