KInit - Current state and benchmarks

[Milian Wolff]

On Montag, 25. November 2019 22:57:11 CET Albert Astals Cid wrote:
> El dissabte, 23 de novembre de 2019, a les 11:47:40 CET, Milian Wolff va 
escriure:
> > On Mittwoch, 19. Juni 2019 19:57:56 CET Albert Astals Cid wrote:
> > > El dimarts, 18 de juny de 2019, a les 12:04:38 CEST, David Edmundson va
> > 
> > escriure:
> > > > > Are we sure it's fair to assume people have SSD? our of the 4
> > > > > laptops i
> > > > > own, only 2 have SSD.>
> > > > 
> > > > It's at least safe to assume it's the trend moving forward.
> > > > 
> > > > > Do you think it's worth me trying in one of the two that don't have
> > > > > SSD?
> > > > 
> > > > More data is normally a good thing. If you or anyone else wants to
> > > > collect stats:
> > > > From my git link above, it's as simple as running the normal ; cmake;
> > > > make ; ./kinittest -median 5
> > > 
> > > On my very old/very slow computer seems to make a lot of difference
> > > 
> > > RESULT : DaveTest::testQProcess():
> > >      2,625 msecs per iteration (total: 2,625, iterations: 1)
> > > 
> > > RESULT : DaveTest::testKInit():
> > >      1,852 msecs per iteration (total: 1,852, iterations: 1)
> > > 
> > > RESULT : DaveTest::testQProcess():
> > >      2,390 msecs per iteration (total: 2,390, iterations: 1)
> > > 
> > > RESULT : DaveTest::testKInit():
> > >      1,846 msecs per iteration (total: 1,846, iterations: 1)
> > 
> > Hey Albert,
> > 
> > these numbers are quite impressive but I can't quite explain those. Are
> > you
> > measuring maybe a full debug build without any compiler optimizations?
> 
> I obviously can't remember, this was *months* ago, but i just ran the test
> again (making sure -O3 was there and not any -g) and got a bit different
> results, so maybe it was.

Does this apply to your whole stack (instead of just the inittest from Dave)?

> New results:
>  * testQProcess: 2200 msec per iteration
>  * testKInit:    1700 msec per iteration
> 
> Still a 20% speed improvement.
> 
> > Then
> > the library sizes will be _much_ larger and thus trigger more page faults.
> > If every one of those is extremely slow on that machine compared to more
> > modern machines?
> > 
> > May I ask how old this machine is and what the speed of the HDD is?
> 
> It's a Lenovo ideapad S10-3t, around 10 years old, the HDD is slow. But it's
> of similar power to the Librecomputer La Frite i just got for free at
> LinuxAppSummit, so even this is on the slow end of things we support i
> think there's value on supporting it.
> 
> If you're interested i can arrange you to get ssh access to the machine (the
> ideapad, i don't have all the KF5/Qt stack built for the LaFrite).

Yes, that would be interesting for me!

Cheers
-- 
Milian Wolff
mail at milianw.de
http://milianw.de
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