Benjamin Edelman wrote:
>
> I'm running JDK 1.1.7v3 on an i386 running RedHat 5.2. The JDK has a nasty
> habit of bailing out with an out of memory error before my machine has
> actualy run out of memory
Some things to try:
1) Make sure you're not out of memory due to other big processes
running.
2) Check the contents of /proc/meminfo to make sure you have all the
memory and swap you think you do (you do boot with the linux "mem="
option, right?).
3) Type "ulimit -a" into bash to see if you've got a "max memory size"
or "data seg size" other than unlimited.
Nathan
> (yes, I used the mx option, also I have 192m of
> ram with 100m swap space). I put together the following test program which
> demonstrates the problem (on my i386 anyways, it works just fine on my
> Solaris Sparc).
>
> public class memHog {
>
> public static void main(String args[]) {
> int outerDimension = 64;
> int innerX = 1024;
> int innerY = 1024;
>
> System.out.println("Allocating " + 1024*1024*64*4 + " bytes.");
> int bigAssArr[][][] = new int[outerDimension][][];
> for (int i=0; i<outerDimension; ++i) {
> bigAssArr[i] = new int[innerX][];
> for (int j=0; j<innerX; ++j) {
> bigAssArr[i][j] = new int[innerY];
> for (int k=0; k<innerY; ++k) {
> bigAssArr[i][j][k] = k;
> }
> }
> System.out.println(1024*1024*i*4 + " bytes allocated...");
> }
> System.out.println("DONE!");
> }
> }
>
> a sample run:
>
> $ java -mx200m memHog
> Allocating 134217728 bytes.
> 0 bytes allocated...
> 4194304 bytes allocated...
> 8388608 bytes allocated...
> 12582912 bytes allocated...
> 16777216 bytes allocated...
> 20971520 bytes allocated...
> 25165824 bytes allocated...
> Before GC. Free=187032. Total=33660920.
>
> After GC. Free=187032. Total=33660920.
>
> DONE!
>
> The amount of memory used does not have an obvious correlation to the mx
> value(at least not obvious to me)
>
> any sugestions??
>
> thanks,
> -Ben Edelman
>
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