#405 newer releases of Regina exhaust virtual memory

[Gerard Schildberger]

Regina releases 3.4 ---> 3.7 (inclusive) exhaust virtual memory for a
large REXX program (not included here). Regina release 3.3 doesn't fail.

In an attempt to recreate this problem, I have written a emulation REXX program that exhausts
virtual memory (i.e., "system resources exhausted), showing that the later releases of Regina
exhaust virtual memory. Note that Regina 3.3 also fails under Windows/XP with this test
REXX program, but under Windows 7 it does not fail.

This bug report may shed light on the Regina bug 3564586 (which may possibly, in fact, be the
cause of this bug).

The include file (named EXHAUST.REX) has more information/documentation.

[Gerard Schildberger]

a REXX program to eimulate a much larger REXX program.

[Gerard Schildberger]

This is a new version of bug report 3603643 which I would like closed (it was
opened by me), but SourceForge won't me delete or upload files to that bug (I
wasn't logged in while I created that bug report, and that may be the cause of
that problem). __________________________________ Gerard Schildberger

[Bruce]

I tried running your EXHAUST.REX program, and it seemed to run just fine.
/usr/local/bin/regina *.REX
segSize= 10000 times=100000 REXX version: REXX-Regina_3.8.2(MT) 5.00 22 Jun 2014
generating 100000 segments took 7.69 seconds.
using 0 and cseg: 0
using 100 and cseg: 1
using 200 and cseg: 2
…
using 99800 and cseg: 998
using 99900 and cseg: 999
consolidation 1000 segments took 224.35 seconds.

Is there something else I should be looking for?

[Gerard Schildberger]

It would be nice to know which operating system (version, release ...) that you used to run the EXHAUST.REX program.

Also, are you using a 32 or 64 bit version of Regina?

I re-ran the EXHAUST.REX program (just now) using the latest release of Regina (3.9.0) on (Microsoft) Windows/XP and Windows 7 (both of which failed).

I have installed the 32-bit version of Regina on both of my systems.

Here is the output for Windows/XP (1st line appears to wrap):
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
segSize= 10000 times=100000 REXX version: REXX-Regina_3.9.0(MT) 5.00 16 Oct 2014
generating 100000 segments took 101.88 seconds.
using 0 and cseg: 0
using 100 and cseg: 1
using 200 and cseg: 2
using 300 and cseg: 3
.
.
.
using 17000 and cseg: 170
using 17100 and cseg: 171
using 17200 and cseg: 172
using 17300 and cseg: 173
67 +++ gg.cseg = gg.cseg || g.j /consolidate,/
Error 5 running "D:\exhaust.rex", line 67: System resources exhausted
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

The above PeeCee is a 733 MgHz single engine.

Here is the output for Windows 7 (1st line appears to wrap):
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
segSize= 10000 times=100000 REXX version: REXX-Regina_3.9.0(MT) 5.00 16 Oct 2014
generating 100000 segments took 0.73 seconds.
using 0 and cseg: 0
using 100 and cseg: 1
using 200 and cseg: 2
using 300 and cseg: 3
.
.
.
using 16000 and cseg: 160
using 16100 and cseg: 161
using 16200 and cseg: 162
67 +++ gg.cseg = gg.cseg || g.j /consolidate,/
Error 5 running "j:\exhaust.rex", line 67: System resources exhausted
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

The above PeeCee is about 3.2 MgHz quad engine.

So, apparently (?) the OS has an effect on all this.
________ Gerard Schildberger

[Bruce]

Mac OSX 10.7.5/Darwin 11.4.2
/usr/local/bin/rexx: Mach-O 64-bit executable x86_64
Intel Core 2 Duo

[Gerard Schildberger]

Well, using a 64 bit virtual memory is a lot larger than the size that the (above) REXX program was designed to run in (based on the other REXX programs that have failed). Keep in mind, the above REXX program is a very very simple program that (I think) stresses the same design points as the huge programs that have been failing. Having that much memory would make it almost impossible to fail, I would think. All of the programs that I have used have failed (so far) use a 32-bit version of Regina (which uses roughly 2 billion bytes of virtual storage). _____ Gerard Schildberger

[Bruce]

I downloaded and compiled Regina 3.9.0 from the source forge files.
The program ran exactly like it did on the 64 bit system.
…
using 99500 and cseg: 995
using 99600 and cseg: 996
using 99700 and cseg: 997
using 99800 and cseg: 998
using 99900 and cseg: 999
consolidation 1000 segments took 307.82 seconds.

Mac OSX 10.6.8/Darwin 10.8.0
Intel Core Duo 1.83GHz/2GB Ram Note: this is a 32bit system with only 2GB or RAM.
/usr/local/bin/rexx: Mach-O executable i386