drjava-hackers

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Bugs item #2013669, was opened at 2008-07-08 12:32
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https://sourceforge.net/tracker/?func=detail&atid=438935&aid=2013669&group_id=44253

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Category: Interactions
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Mathias Ricken (mgricken)
Assigned to: Nobody/Anonymous (nobody)
Summary: DrJava slows to a crawl with repeated println statements

Initial Comment:
Created from the support request

[ 2013647 ] DrJava slows to a crawl with repeated println statements

https://sourceforge.net/tracker/index.php?func=detail&aid=2013647&group_id=44253&atid=438936

Right now, I'm guessing it has something to do with the length of the interactions document. The first few lines, e.g. from 0 to 1000 go very fast, then it slows down. If the for loop finishes, and there are 5000 lines in the interactions document, and I run the same for loop again, the output is slow right from the beginning. This indicates that a long document makes printing slow.

Furthermore, which is of even higher importance, in the current version (and the last beta), we can't even run the for loop in the submission below. There is no way to write a for loop in newer versions in DrJava!

See:
https://sourceforge.net/tracker/index.php?func=detail&aid=1954403&group_id=44253&atid=438935

Text below:

I am using DrJava with students in a Linux lab at the
University of Chicago. Simple programs cause it to
become unresponsive. For example, a simple "for"
statement:

for(int i = 0; i < 5000; i++){
System.out.println(i);
}

will bog down and almost stop the system after about
2000 lines. The DrJava screen will also stop refreshing,
and it takes about 5 minutes to respond to the "Reset"
button.

I have tried this with several versions of DrJava and
on several machines with slightly different linux
installations.

We are running DrJava via the resident java
("java -jar drjava.jar" more-or-less).

I would appreciate any help you can give, as this
is certainly creating havoc in my class! Thanks.

-- Walter Carlip

Here is the DrJava "about" box for a typical lab
system:

Drjava Version: 20080112-0033
DrJava Configuration file /ad/ysp112/.drjava
Used memory. about 6.05 megabytes
Free memory. about 1.61 megabytes
Total memory. about 7.68 megabytes
Total memory can expand to: about 63.56 megabytes

. . . and here are the System Properties . . .

System Properties:
DrJava Version 20080112-0033
drjava.debug.port = 48550
java.runtime.name = Java(TM) SE Runtime Environment
sun.boot.library.path = /usr/java/jdk1.6.0_06/jre/lib/i386
java.vm.version = 10.0-b22
java.vm.vendor = Sun Microsystems Inc.
java.vendor.url = http://java.sun.com/
path.separator = :
java.vm.name = Java HotSpot(TM) Client VM
file.encoding.pkg = sun.io
sun.java.launcher = SUN_STANDARD
user.country = US
sun.os.patch.level = unknown
java.vm.specification.name = Java Virtual Machine Specification
user.dir = /net/galactica<anonymized user.home>
java.runtime.version = 1.6.0_06-b02
java.awt.graphicsenv = sun.awt.X11GraphicsEnvironment
java.endorsed.dirs = /usr/java/jdk1.6.0_06/jre/lib/endorsed
os.arch = i386
java.io.tmpdir = /tmp
line.separator = "\u000a"
java.vm.specification.vendor = Sun Microsystems Inc.
os.name = Linux
sun.jnu.encoding = ISO-8859-1
java.library.path =
/usr/java/jdk1.6.0_06/jre/lib/i386/client:/usr/java/jdk1.6.0_06/jre/lib/i38
6:/usr/java/jdk1.6.0_06/jre/../lib/i386:/usr/local/lib:/usr/lib:/usr/openwi
n/lib:/opt/SUNWdtpcv/lib:/usr/java/packages/lib/i386:/lib:/usr/lib
java.specification.name = Java Platform API Specification
java.class.version = 50.0
sun.management.compiler = HotSpot Client Compiler
os.version = 2.6.25.9-76.fc9.i686
user.home = <anonymized user.home>
user.timezone = America/Chicago
java.awt.printerjob = sun.print.PSPrinterJob
file.encoding = ISO-8859-1
java.specification.version = 1.6
java.class.path = /usr/local/drjava
user.name = <anonymized user.name>
java.vm.specification.version = 1.0
java.home = /usr/java/jdk1.6.0_06/jre
sun.arch.data.model = 32
user.language = en
java.specification.vendor = Sun Microsystems Inc.
java.vm.info = mixed mode, sharing
java.version = 1.6.0_06
java.ext.dirs =
/usr/java/jdk1.6.0_06/jre/lib/ext:/usr/java/packages/lib/ext
sun.boot.class.path =
/usr/java/jdk1.6.0_06/jre/lib/resources.jar:/usr/java/jdk1.6.0_06/jre/lib/r
t.jar:/usr/java/jdk1.6.0_06/jre/lib/sunrsasign.jar:/usr/java/jdk1.6.0_06/jr
e/lib/jsse.jar:/usr/java/jdk1.6.0_06/jre/lib/jce.jar:/usr/java/jdk1.6.0_06/
jre/lib/charsets.jar:/usr/java/jdk1.6.0_06/jre/classes
java.vendor = Sun Microsystems Inc.
file.separator = /
java.vendor.url.bug = http://java.sun.com/cgi-bin/bugreport.cgi
sun.io.unicode.encoding = UnicodeLittle
sun.cpu.endian = little
java.rmi.server.hostname = 127.0.0.1
sun.awt.exception.handler = edu.rice.cs.drjava.ui.DrJavaErrorHandler
sun.cpu.isalist =

#DrJava configuration file
#Tue Jul 08 11:50:30 CDT 2008
key.delete.next = shift DELETE
key.delete.previous = shift BACK_SPACE
save.before.compile = true
remote.control.enabled = false
recent.files = [/net/galactica<anonymized
user.home>/test1.java,/net/galactica<anonymized
user.home>/test1.dj2,/net/galactica<anonymized
user.home>/test1.dj0,/net/galactica<anonymized user.home>/test.java]
window.height = 965
window.width = 1270
window.x = 0
window.y = 0
window.state = 0
last.dir = /net/galactica<anonymized user.home>
last.interactions.dir = /net/galactica<anonymized user.home>


Used memory: about 5.87 megabytes
Free memory: about 1.81 megabytes
Total memory: about 7.68 megabytes
Total memory can expand to: about 63.56 megabytes

-- Walter Carlip


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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=438935&aid=2013669&group_id=44253