Topcom isRegularTriangulation example running out of memory on some s390x builds

[d-torrance]

From a recent PPA build of the development branch on s390x using Ubuntu 20.04. (The same thing happened in Ubuntu 20.10, but not Ubuntu 18.04 or Ubuntu 21.04, where everything built just fine):

-- making example results for "isRegularTriangulation"                     
 ulimit -c unlimited; ulimit -t 700; ulimit -m 850000; ulimit -s 8192; ulimit -n 512;  cd /tmp/M2-25317-0/1-rundir/; GC_MAXIMUM_HEAP_SIZE=400M "/<<BUILDDIR>>/macaulay2-1.16.99+git202012151651/M2/usr-dist/s390x-Linux-Ubuntu-20.04/bin/M2-binary" -q --int --no-randomize --no-readline --silent --stop --print-width 129 -e 'needsPackage("Topcom", Reload => true, FileName => "/<<BUILDDIR>>/macaulay2-1.16.99+git202012151651/M2/Macaulay2/packages/Topcom.m2")' <"/tmp/M2-25317-0/0_is__Regular__Triangulation.m2" >>"/<<BUILDDIR>>/macaulay2-1.16.99+git202012151651/M2/usr-dist/common/share/doc/Macaulay2/Topcom/example-output/_is__Regular__Triangulation.errors" 2>&1
/<<BUILDDIR>>/macaulay2-1.16.99+git202012151651/M2/usr-dist/common/share/doc/Macaulay2/Topcom/example-output/_is__Regular__Triangulation.errors:0:1: (output file) error: Macaulay2 exited with status code 1
/tmp/M2-25317-0/0_is__Regular__Triangulation.m2:0:1: (input file)
M2: *** Error 1
 -- 763.683 seconds elapsed
 -- storing example results from output file../../../usr-dist/common/share/doc/Macaulay2/Topcom/example-output/_is__Regular__Triangulation.out
 -- warning: missing file /<<BUILDDIR>>/macaulay2-1.16.99+git202012151651/M2/usr-dist/common/share/doc/Macaulay2/Topcom/example-output/_is__Regular__Triangulation.out
../../m2/debugging.m2:20:6:(1):[9]: error: installPackage: 1 error(s) occurred running examples for package Topcom:

_is__Regular__Triangulation.errors
**********************************
         {0,2,4}, {3,4,5}, {1,2,3}}

o2 = {{0, 1, 2}, {1, 3, 5}, {2, 3, 4}, {0, 1, 5}, {0, 2, 4}, {3, 4, 5}, {1, 2, 3}}

o2 : List

i3 : isRegularTriangulation(A,tri)


 *** out of memory trying to allocate 3311714395 bytes, exiting ***

../../m2/installPackage.m2:684:14:(1):[8]: --back trace--
../../m2/methods.m2:119:80:(1):[7]: --back trace--
../../m2/option.m2:16:8:(1):[6]: --back trace--
../../m2/installPackage.m2:568:5:(1):[5]: --back trace--
../../m2/methods.m2:119:80:(1):[4]: --back trace--
../../m2/option.m2:16:8:(1):[3]: --back trace--
currentString:1:1:(3):[2]: --back trace--
Macaulay2/Core/startup.m2.in:563:33:(0):[1]: --back trace--
Macaulay2/Core/startup.m2.in:674:6:(0): --back trace--
make[4]: *** [Makefile:93: /<<BUILDDIR>>/macaulay2-1.16.99+git202012151651/M2/usr-dist/s390x-Linux-Ubuntu-20.04/lib/s390x-linux-gnu/Macaulay2/Topcom/.installed] Error 1

3311714395 bytes?!? That's over 3 gigs! Is this example really that big?

[d-torrance]

The weird thing is that this function pretty much just calls topcom...

M2/M2/Macaulay2/packages/Topcom.m2

Lines 115 to 120 in afaa83b

	isRegularTriangulation = method(Options=>{Homogenize=>true})
	isRegularTriangulation(Matrix, List) := opts -> (A, tri) -> (
	-- now create the output file
	(outfile, errfile) := callTopcom("checkregularity --checktriang -v", {topcomPoints(A, opts), [], tri });
	match("Checked 1 triangulations, 0 non-regular so far", get errfile)
	)

[DanGrayson]

3311714395 bytes?!? That's over 3 gigs! Is this example really that big?

No, it can't be, because we enforce a memory limit, and the example has worked in the past.

[d-torrance]

Possibly related. check_1 "Topcom", which tests isRegularTriangulation, timed out on an armhf Ubuntu 18.04 PPA build:

if ! grep "CacheExampleOutput => true" ./Topcom.m2 >/dev/null ; then /<<BUILDDIR>>/macaulay2-1.16.99+git202101061312/M2/usr-dist/arm-Linux-Ubuntu-18.04/bin/M2 -q --no-preload --stop --silent -e "needsPackage(\"Topcom\",LoadDocumentation=>true,DebuggingMode=>true); check(Topcom,UserMode=>false,Verbose=>true); exit 0" ; fi 
 -- running   check(0, "Topcom")                                             -- 2.75511 seconds elapsed
 -- capturing check(1, "Topcom")                                            
E: Build killed with signal TERM after 150 minutes of inactivity

[d-torrance]

This happened again, but now on the next test:

if ! grep "CacheExampleOutput => true" ./Topcom.m2 >/dev/null ; then /<<BUILDDIR>>/macaulay2-1.17.1.1+git202101251610/M2/usr-dist/arm-Linux-Ubuntu-18.04/bin/M2 -q --no-preload --stop --silent -e "needsPackage(\"Topcom\",LoadDocumentation=>true,DebuggingMode=>true); check(Topcom,UserMode=>false,Verbose=>true); exit 0" ; fi 
 -- running   check(0, "Topcom")                                             -- 1.43566 seconds elapsed
 -- skipping  check(1, "Topcom")                                             -- 0.000170822 seconds elapsed
 -- capturing check(2, "Topcom")                                            
E: Build killed with signal TERM after 150 minutes of inactivity

[d-torrance]

And again:

/<<BUILDDIR>>/macaulay2-1.17.2.1+git202105071727/M2/usr-dist/x86_64-Linux-Ubuntu-21.10/bin/M2 -q --no-preload --stop --silent -e "needsPackage(\"Topcom\",LoadDocumentation=>true,DebuggingMode=>true); check(Topcom,UserMode=>false,Verbose=>true); exit 0" 
 -- running   check(0, "Topcom")                                             -- 0.303817 seconds elapsed
 -- skipping  check(1, "Topcom")                                             -- 0.000048815 seconds elapsed
 -- capturing check(2, "Topcom")                                            
E: Build killed with signal TERM after 150 minutes of inactivity

[d-torrance]

Ran out of memory on another Topcom test in an amd64 Ubuntu 21.04 PPA build:

 -- running   check(0, "Topcom")                                            
 ulimit -c unlimited; ulimit -t 700; ulimit -m 850000; ulimit -s 8192; ulimit -n 512;  cd /tmp/M2-7356-0/1-rundir/; GC_MAXIMUM_HEAP_SIZE=400M "/<<BUILDDIR>>/macaulay2-1.18.0.1+git202106251709/M2/usr-dist/x86_64-Linux-Ubuntu-21.04/bin/M2-binary" -q --int --no-randomize --no-readline --silent --stop --print-width 77 -e 'needsPackage("Topcom",Reload=>true,FileName=>"/<<BUILDDIR>>/macaulay2-1.18.0.1+git202106251709/M2/Macaulay2/packages/Topcom.m2")' <"/tmp/M2-7356-0/0.m2" >>"/tmp/M2-7356-0/0.tmp" 2>&1
/tmp/M2-7356-0/0.tmp:0:1: (output file) error: Macaulay2 exited with status code 1
/tmp/M2-7356-0/0.m2:0:1: (input file)
M2: *** Error 1
 -- 847.387 seconds elapsed
 -- skipping  check(1, "Topcom")                                             -- 0.000046747 seconds elapsed
 -- skipping  check(2, "Topcom")                                             -- 0.000026299 seconds elapsed
 -- running   check(3, "Topcom")                                             -- 0.338551 seconds elapsed
 -- capturing check(4, "Topcom")                                             -- 0.149882 seconds elapsed
Topcom.m2:370:1-382:1: error:
 -- o3 = {{0, 2, 4}, {2, 3, 4}, {0, 1, 4}, {1, 3, 4}}
 -- 
 -- o3 : List
 -- 
 -- i4 :   assert isRegularTriangulation(A,tri)
 -- 
 -- i5 :   assert(regularTriangulationWeights(A,tri,Homogenize=>false) == {1,1,0,0,0})
 -- 
 -- 
 --  *** out of memory trying to allocate 954956588 bytes, exiting ***
 -- 
../m2/debugging.m2:23:6:(1):[9]: error: test(s) #0 of package Topcom failed.

Again, the number of bytes we're trying to allocate seems very large -- nearly a gig!