On 14/02/2015 12:03 AM, Lev Priima wrote:
Please review and push:
http://cr.openjdk.java.net/~lpriima/8073124/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-8073124

I hadn't realized 8072909 had been pushed without final reviewer comments being addressed. :(

These changes seem okay. I hope they get promoted at the same time as the original changeset so we don't get test failures.

Thanks,
David

Lev

On 02/13/2015 05:20 AM, David Holmes wrote:
Hi Lev,

On 13/02/2015 2:56 AM, Lev Priima wrote:
Christos,

Test may fail on shorter arrays(page 8 of paper). For instance, on worst
case, generated by test, it starts to fail on length 67108864.
After increasing stack size of runs to merge, Arrays.sort(T[]) works
also on maximum possible array for HotSpot JVM.

I'd also like to see this documented somewhere in the code. Presently
there is a reference to listsort.txt but then you have to go and find
it on the web. :( At a minimum could we please add:

 175          * computation below must be changed if MIN_MERGE is
decreased.  See
 176          * the MIN_MERGE declaration above for more information.
+             * The maximum value of 49 allows for an array up to length
+             * Integer.MAX_VALUE-4.

Roger, David,
I've updated the test (
http://cr.openjdk.java.net/~lpriima/8072909/webrev.01/test/java/util/Arrays/TimSortStackSize2.java.html

) to make it more suitable for regular execution:

   27  * @run main/othervm TimSortStackSize2 67108864

This will still fail on small memory devices:

:~> java TimSortStackSize2 67108864
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space

as the default heap ergonomics may not be large enough. I had to add a
minimum heap of -Xmx385M to get it to run.

Thanks,
David

   28  * not for regular execution on all platforms:
   29  * run main/othervm -Xmx8g TimSortStackSize2 1073741824
   30  * run main/othervm -Xmx32g TimSortStackSize2 2147483644

Could you please push this:
http://cr.openjdk.java.net/~lpriima/8072909/webrev.01/
?

Lev

On 02/12/2015 12:54 PM, chris...@zoulas.com wrote:
On Feb 12, 9:57pm,david.hol...@oracle.com  (David Holmes) wrote:
-- Subject: Re: 8072909: TimSort fails with
ArrayIndexOutOfBoundsException on

| Ok - thanks Lev!
|
| David

For posterity can someone document this, and also the value for which
Integer.MAX_VALUE-4 fails?

christos


Reply via email to