Name: rlT66838 Date: 09/02/99


Loading/parsing the html32.bdtd file is done using unbuffered 1 byte
reads. This can slow down startup of swing applications; one example
is 'SwingSet' (during SwingSet startup, you'll notice a relatively
long pause during the "Loading HTML Text Example" initialization
phase).

The problem can be reproduced with truss as follows:

  % mkdir /tmp/marker
  % cd /opt/jdk1.2.2/demo/jfc/SwingSet
  % truss -o /tmp/java.truss /opt/jdk1.2.2/bin/java -Xbootclasspath:/tmp/marker:/opt/jdk1.2.2/jre/lib/rt.jar -jar SwingSet.jar

In the truss output file /tmp/java.truss, search for the string
'html32.bdtd'. Soon after the classloader checks for the file
/tmp/marker/javax/swing/text/html/parser/html32.bdtd, the following
sequence of system calls can be observed:

stat("/tmp/marker/javax/swing/text/html/parser/html32.bdtd", 0xFFBECE88) Err#2 E
NOENT
resolvepath("/opt/jdk1.2.2/jre/lib/rt.jar", "/opt/jdk1.2.2/jre/lib/rt.jar", 1024
) = 28
llseek(3, 4073891, SEEK_SET) = 4073891
read(3, " P K0304\n\0\0\0\0\083 ".., 30) = 30
llseek(3, 4073961, SEEK_SET) = 4073961
read(3, "\0", 1) = 1
llseek(3, 4073962, SEEK_SET) = 4073962
read(3, "\0", 1) = 1
llseek(3, 4073963, SEEK_SET) = 4073963
read(3, "\0", 1) = 1
llseek(3, 4073964, SEEK_SET) = 4073964
read(3, "01", 1) = 1
llseek(3, 4073965, SEEK_SET) = 4073965
read(3, "01", 1) = 1
llseek(3, 4073966, SEEK_SET) = 4073966
read(3, " P", 1) = 1
llseek(3, 4073967, SEEK_SET) = 4073967
read(3, "\0", 1) = 1
llseek(3, 4073968, SEEK_SET) = 4073968
read(3, "06", 1) = 1
llseek(3, 4073969, SEEK_SET) = 4073969
read(3, " A", 1) = 1
llseek(3, 4073970, SEEK_SET) = 4073970
read(3, " a", 1) = 1
llseek(3, 4073971, SEEK_SET) = 4073971
read(3, " c", 1) = 1
llseek(3, 4073972, SEEK_SET) = 4073972
read(3, " u", 1) = 1
llseek(3, 4073973, SEEK_SET) = 4073973
read(3, " t", 1) = 1
llseek(3, 4073974, SEEK_SET) = 4073974
read(3, " e", 1) = 1

and so on...

This is obviously not a very efficient way to sequentially read a
file!
(Review ID: 94440)
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