From kfm-devel Wed Apr 26 23:49:27 2000 From: Andreas Pour Date: Wed, 26 Apr 2000 23:49:27 +0000 To: kfm-devel Subject: Memory Usage X-MARC-Message: https://marc.info/?l=kfm-devel&m=95679314512993 Hi, When viewing a not-so-realistic file -- like this: 11
. . . (repeat 11
about 55,000 times) 11
I noticed a couple of (well, three) strange things in Konqi. First, it takes a long time -- about 20 seconds on a 350Mhz processor -- to open the file. It takes vi about 1/10th of a second. To quantify this, I used vi to open this file: time vi test.html 0.08user 0.01system 0:00.90elapsed 9%CPU (0avgtext+0avgdata 0maxresident)k Then I used konqueror (3 tests): time konqueror test.html 24.43user 0.65system 0:30.07elapsed 83%CPU (0avgtext+0avgdata 0maxresident)k 26.19user 0.66system 0:30.38elapsed 88%CPU (0avgtext+0avgdata 0maxresident)k 24.67user 0.68system 0:28.76elapsed 88%CPU (0avgtext+0avgdata 0maxresident)k To shave off the overhead from starting konqueror (I restarted konqueror each time), I ran konqueror with the same file as above, without the extra 55,000 lines: 3.33user 0.15system 0:09.00elapsed 38%CPU (0avgtext+0avgdata 0maxresident)k 3.38user 0.13system 0:06.49elapsed 54%CPU (0avgtext+0avgdata 0maxresident)k 3.28user 0.19system 0:08.00elapsed 43%CPU (0avgtext+0avgdata 0maxresident)k Thus, it took 20 seconds of full CPU time to parse this file (layout/rendering shouldn't take very long since no widgets are created and the layout is very simple). And since the great bulk of this time is spent by kio_file loading the file, I don't know why konqi burns the CPU on this. Second, memory usage seemed somewhat excessive. Starting konqueror with the small test file: PID TTY STAT TIME MAJFL TRS DRS RSS %MEM COMMAND 1554 pts/8 S 0:03 2372 2 15729 10676 8.3 konqueror /tmp/tests.html Using the large test file: PID TTY STAT TIME MAJFL TRS DRS RSS %MEM COMMAND 1563 pts/8 S 0:24 2380 2 44473 39452 30.8 konqueror /tmp/test.html So for a file of size 382,398 bytes, Konqi is using 30Mbytes of memory. I tried a medium test file of 5000 of the '11
' lines (size = 35002 bytes) and memory usage was: PID TTY STAT TIME MAJFL TRS DRS RSS %MEM COMMAND 1954 pts/8 S 0:05 2939 2 18105 13048 10.2 konqueror /tmp/testm.html Plugging together my 3 data points, I get the rough formula: 10.6MB + 70 * filesize which seems a lot for a file with such a simple layout. Just out of curiosity, I removed all the
's and put the 55,000 lines of '11' between

 tags, and the result was:

time konqueror /tmp/testp.html
7.86user 0.44system 0:14.31elapsed 57%CPU (0avgtext+0avgdata
0maxresident)k

and memory usage was:

  PID TTY      STAT   TIME  MAJFL   TRS   DRS  RSS %MEM COMMAND 
 1978 pts/8    S      0:07   2373     2 19617 14568 11.3 konqueror
/tmp/testp.html

So about 16 seconds faster and about 1/7th the memory consumption . . .
.


Third, the file is displayed strangely.  The first roughly 10% of the
lines have what appear to be two blobs in each line, which should be
1's.  The rest of the lines are empty -- it appears as if lines are
being drawn on top of each other, but offset horizontally a bit.  (The
small and medium files display correctly but the display with the 
tags was even stranger -- 3 blobs per line for about the first 7% and
the rest of the lines empty).

Ciao,

Andreas