--===============1463819666==
Content-Type: multipart/signed;
  boundary="nextPart2338291.oHozE18fL9";
  protocol="application/pgp-signature";
  micalg=pgp-sha1
Content-Transfer-Encoding: 7bit

--nextPart2338291.oHozE18fL9
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

Hi,

On Monday 19 May 2008, James Ellis wrote:
> Hi
>
> I'm not sure about anyone else but I find Quanta's CPU and memory
> usage to be pretty extreme, especially on startup.=20

Would be nice to see some figures. As we know [*] top is not a good tool=20
on Linux to measure memory consumption, but I use it to see memory=20
increase/decrease during time.=20

I started Quanta without any project, and it shows  199m  41m  25m (VIRT=20
RES SHR). This is little more than Kate (171, 29, 21). After I load the=20
project that holds all the kdewebdev.org web pages: 202m  44m  25m
I find this increase minimal.
After loading my huge test html file (700KB, 12000 lines): 234m  71m  26m=20
=2E Now indeed the memory usage increased, but this was an extreme file. Th=
=20
e increase is partly because of katepart (the editor) and partly because=20
of the Quanta internals (the node tree).
Showing the structure tree for this file increases some more: 253m  90m =20
26m. Unfortunately even after closing the file, top shows the same=20
amount. But there isn't that huge leak (I don't say there isn't any, see=20
below), as if you reopen again the same file, you get: 253m  91m  26m.
I had to close/open several times the same file to see +1m increase=20
again.

So I'd like to know what do you see there (sorry if you already told=20
that, I still have some mails to read).

> Out of all the KDE
> apps that I use it's the one that slows down the system the most, by
> a fair margin. To the point where there is a noticeable lag when
> typing this message between key stroked and the key appearing on the
> page.

That usually indicates that the parser reparses continuously the whole=20
file as it cannot find the area that was changed. Normally I'd say to give=
=20
us the file for testing, but I don't do that as sincerely the parser used=20
in Quanta 3 is dead, it is not used anymore in Quanta4 and we don't have=20
the resources to do big changes in Quanta3.=20

> It's most noticeable on startup when a project is being scanned -
> it's less of an issue with small projects which would point to a
> scaling issue. I regularly see CPU usage between 50 and 99% and
> memory usage generally outstrips Xorg which usually runs at 6% or so.

As the other thread shows, the project parsing is fast. I'd suspect the=20
code parser to be slow. Anyway, try to configure quanta to not open the=20
last opened files in the project and see how it works.

> Once Quanta has finished it's startup dance, system load returns to
> normal.
> Doing an strace on the process reveals what looks to be Quanta doing
> a stat on every file in the project.

That is interesting. Quanta stats the files, but I don't remember doing=20
it on opening, but before uploading (there you can see that it is slow=20
before the upload dialog shows and marks which files need to be=20
uploaded).

> So, I guess the big questions are
> - is this cpu and memory usage really needed?

The answer is: probably yes, otherwise it wouldn't use it. ;) CPU and=20
memory usage was important everytime, as I usually tested Quanta also on=20
a low-end system (550Mhz, 192MB ram). I found to be usable there as=20
well. I admit that my tests may not reflect the usage of all users, but=20
for what I did was ok.

> - Does Quanta need to stat every file in the project on startup?

Now I checked the code. It indeed stats every file, if it is a local=20
project, to check if it exists or not. If not, it is removed from the=20
project file. The drawbacks of storing the file names in the project=20
file... Is it needed? Probably it isn't mandatory, but it is a nice=20
feature. I could suggest to you one thing, if you are not afraid of=20
touching the code and compile the source: comment out
projectlist.cpp, line 87 until line 100, the check if it is a local file,=20
and if it is the check if the file exists or not.

> - Couldn't it just read the XML project file and put a representation
> of that in the file tree?=20
This is what it does.

Andras
=2D-=20
=20
Quanta Plus developer - http://quanta.kdewebdev.org
K Desktop Environment - http://www.kde.org

--nextPart2338291.oHozE18fL9
Content-Type: application/pgp-signature; name=signature.asc 
Content-Description: This is a digitally signed message part.

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.9 (GNU/Linux)

iD8DBQBIObp6TQdfac6L/08RAj0ZAJwI5dC4JtVo9VSj2yuMgc3BaoCDgQCfYwQc
IZgrVg90qgqWirUS2jTJYKg=
=RGsa
-----END PGP SIGNATURE-----

--nextPart2338291.oHozE18fL9--

--===============1463819666==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________
Quanta mailing list
Quanta@mail.kde.org
https://mail.kde.org/mailman/listinfo/quanta

--===============1463819666==--