[fedora-java] Re: java issues on ppc

[Orion Poplawski]

Robin Green wrote:
> It's tricky - but possible - to debug interpreted bytecode. JDWP protocol
> support is being worked on, but it's not ready yet.
> 
> Is plplot multithreaded? I've just discovered a thread-safety bug in the
> gij interpreter which has lain unfixed for several years:
> 
>  http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23367
> 
> I'm told that this bug only affects the interpreter.
> 
> There are also a couple of other threading bugs that I know of (one of
> which is not so easy to reproduce on x86 but easy to reproduce on x86-64,
> FWIW). But both of those are not specific to interpreted code.
> 

Well, plplot is compiled with threading, but I'm not sure it make much 
use of them.  I'll try compiling without threading to see if that makes 
a difference.

> If you want to join the #fedora-java IRC channel on
> irc.freenode.net, I can try and help you debug it over IRC.
>

I'll try soon...

> What kind of problems are you experiencing on ppc, when running plplot as
> interpreted?
> 

Basically, I've got the following call path:

main:
pls.w3d( 1.0, 1.0, 1.0, -1.5, 1.5, -0.5, 1.5, zmin, zmax, alt[k], az[k] );

->

package plplot.core;

public class plplotjavac implements plplotjavacConstants {
   public static void plw3d(double basex, double basey, double height, 
double xmin0, double xmax0, double ymin0, double ymax0, double zmin0, 
double zmax0, double alt, double az) {    plplotjavacJNI.plw3d(basex, 
basey, height, xmin0, xmax0, ymin0, ymax0, zmin0, zmax0, alt, az);
   }
}

->

package plplot.core;

class plplotjavacJNI {
   public final static native void plw3d(double jarg1, double jarg2, 
double jarg3, double jarg4, double jarg5, double jarg6, double jarg7, 
double jarg8, double jarg9, double jarg10, double jarg11);
}


If I print out the values of the arguments in plplotjavac.plw3d, some of 
them are bogus (i.e. basex = 0.0 when it is passed 1.0).  Others are okay.



-- 
Orion Poplawski
System Administrator                   303-415-9701 x222
Colorado Research Associates/NWRA      FAX: 303-415-9702
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