FYI i am using native threads.
also, the garbage collection loop
ONLY tells the system we would like to encourage
a GC pass. i noticed that this DID make the
program have less periodic slowness..
At 08:40 PM 1/5/00 -0200, Edson Carlos Ericksson Richter wrote:
>For all: I'm doing a comparision based on report from Michael E. Moores
>using the same program (see bellow) and anotating reports about memory
>usage (and, of course, stability). Michael reported a crash after 45000
>loops in Linux JDK1.2.2 ("linux 2.2, blackdown 1.2 (glibc 1.2.1)").
>
>My comparision consist in executing same program using JDK 1.2.2 in a
>K6II300/96Mb with WinNT4 using -classic option (I have hotspot installed).
>
>My test started with the following:
>
>loops RAM Virt. Mem. rt.free()
>start 7124K 5072K 2097144
>15000 7128K 5072K 2097144
>80000 7128K 5072K 2097144
>150000 6764K 5072K 2097144 <--!!!!!
>300000 6764K 5072K 2097144
>
>
>As anyone can see, we have no crash, and memory comsuption has decreased
>(why??? I don't know!) after some time...
>Anyone can test the same program in Linux to get another comparision (one
>more than Michael - this can be an issue about a lib or something).
>
>Other thing is interesting: the "forced garbage collecting every 5
>seconds" does nothing. My tests with JFC show that this conding make
>sense, but for this example not.
>
>Simple copy code bellow to a file called "newtest.java", compile and execute.
>
>Edson Richter
>
>
>
>import java.io.*;
>import java.net.*;
>
>public class newtest extends Thread {
> URLConnection yc;
> Runtime rt = Runtime.getRuntime();
> String inputLine;
> int thflag;
> public static void main(String[] args) throws Exception {
> new newtest( args );
> }
> public newtest( String [] args ) {
> int arg, i = 0;
> thflag = 0;
> arg = Integer.parseInt( args[ 0 ] );
> this.start( );
> while( true ) {
> i ++;
> work( i );
> }
>
>// thflag = 1;
> }
> private void work( int i ) {
> try {
> if( i % 100 == 0 ) {
> System.out.println( i + ": " + rt.totalMemory( ) + "
> bytes\n" );
> }
> URL yahoo = new URL( "http://127.0.0.1/" );
> yc = yahoo.openConnection( );
> BufferedReader in = new BufferedReader(new
> InputStreamReader(yc.getInputStream()));
> while((inputLine = in.readLine()) != null) {
> //System.out.println(inputLine);
> }
> in.close();
> in = null;
> yahoo = null;
> } catch( IOException e ){ System.out.println("IO EXC\n"); thflag = 0;}
> }
> public void run( ) {
> while(thflag == 0 ) {
> try {
> this.sleep( 5000 ); // Encourage Garbage Colection every
> 5 seconds
> rt.gc( );
> } catch( Exception e ) {}
> }
> }
>}
>
>
>
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