On Sun, Nov 14, 2004 at 12:52:22AM +0200, Ira Abramov wrote:
> Quoting Yedidyah Bar-David, from the post of Sat, 13 Nov:
> > > 
> > > I surf in tabs. when I middle-click a link, there's a pretty long freeze
> > > while the mozilla allocates the memory for the new tab, draws the tab,
> > > starts twirling the download graphic, and finally the window is
> > > responsive to the mouse cursor again. this process takes under 1/20 of
> > > the time on the same machine running Firefox under windows.
> > 
> > mozilla, on Debian, is a script that does mozilla-bin -remote, if it
> > already runs. So one way to measure such things is to do
> > time xtoolwait sh -c 'mozilla; sleep 2'
> 
> then I would be timing bash and several other unimportant elements. I'm

You will, but they do not take time. Not more than 1%, my estimation.
% time sh -c 'sleep 0'
real    0m0.014s
user    0m0.010s
sys     0m0.000s

> talking about a case where I fire a new tab (not a new process) from
> within the program. the the time it takes to open the tab, and load the
> page, may take 6-10 seconds, where it's less than a second on windows.
> As if the windows version opens a new thread and I get the GUI
> responsive again, while on Linux it acts as if it all blocks for several
> long seconds.

I must say this doesn't sound to me like a performace problem, but like
something that waits for something until it times out. Something like
the famous "no reverse lookup" that comes up here once in a while.

> 
> > > I could not care less about loading time of programs that get started
> > > twice a week and stay open all the time... it's the work speed I am
> > > annoyed by.
> > 
> > Sorry, more people use my machine (at home) so I can't. I think for
> > some time now about stuff like VNC/nx. Anyone cares to share their
> > experience? I must say it puzzles me how it turned out that technically
> 
> you are still running on a P2/166 and you want a multiuser desktop
> environment? that's masochism!

As an XTerminal. It's not that bad for that. Even with KDE (and I
use fvwm). The only thing that I run locally and is slow is xawtv
(because it's more convenient to put the card in it than in the
server).
It is decent only if I lower the resolution. Not the size of the
window, BTW - the resolution. I do not know why, but it's not such
a bother.
Not a P2, BTW - P2 started as 233Mhz. And, now that I am thinking
about it, it's underclocked to 120Mhz (I do not remember why I did
this), with no noticable difference (as an XTerminal).

> 
> > > maybe I have a general problem with memory management? it sometimes also
> > > takes 5-6 seconds for vim to allocate and run when forked (usually from
> > > within mutt...)
> > 
> > Again, very weird.
> > $ time vim -c :q
> > real    0m0.085s
> > user    0m0.050s
> > sys     0m0.020s
> 
> I said SOMETIMES. and of course I can't time this when VIM is already in
> the read cache.

Why not? If you suspect the disk, check the disk. E.g. if it's very
fragmented, it can slow you down considerably. Otherwise, I would rather
check it against the cache, not the disk. The times I wrote for "before"
and "after" prelink are all from the cache. Times from the disk (checked
by prerunning a program that uses a lot of memory, not by rebooting)
were around twice slower.
-- 
Didi


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