Complex test suite may out of memory

[mratsim]

Following #357 and d03994b we have out-of-memory in some builds:

• Travis OOM: https://travis-ci.org/mratsim/Arraymancer/jobs/542973325#L1059
• Appveyor x64 success and x32 OOM: https://ci.appveyor.com/project/mratsim/arraymancer/builds/25131456

[mratsim]

This file file takes 950MB to compile with the current master: https://github.com/mratsim/Arraymancer/blob/d03994b85c8ee69f584889a7fd7f6bc7f594f0ab/tests/tensor/test_operators_blas.nim

but only 500MB to compile in a previous commit https://github.com/mratsim/Arraymancer/blob/18b596bcf1a886e185becdda3342458cfa7b1c35/tests/tensor/test_operators_blas.nim

[mratsim]

Compilation statistics

Note that the timing is best-case scenario as my machine
is an overclocked i9-9980XE (18 cores @ 4.1 GHz)
and files have been compiled twice so many things are cached
(i.e. things that do not use generics/macros/templates)

File	Time	Memory
test_init	1.195 sec	136.898 MiB
test_operators_comparison	2.233 sec	261.375MiB
test_accessors	1.448 sec	169.781MiB
test_accessors_slicer	8.046 sec	770.949MiB
test_display	1.276 sec	169.809MiB
test_operators_blas	9.582 sec	956.172MiB
test_math_functions	3.154 sec	324.348MiB
test_higherorder	3.254 sec	402.641MiB
test_aggregate	5.686 sec	620.504MiB
test_shapeshifting	6.845 sec	770.27MiB
test_broadcasting	8.138 sec	956.484MiB
test_ufunc	2.912 sec	324.457MiB
test_filling_data	1.677 sec	210.66MiB
test_optimization	1.095 sec	136.844MiB
test_exporting	1.208 sec	136.863MiB

[mratsim]

Compilation statistics - before complex

Note that the timing is best-case scenario as my machine
is an overclocked i9-9980XE (18 cores @ 4.1 GHz)
and files have been compiled twice so many things are cached
(i.e. things that do not use generics/macros/templates)

File	Time	Memory
test_init	1.107 sec	136.805MiB
test_operators_comparison	1.453 sec	169.766MiB
test_accessors	1.248 sec	169.809MiB
test_accessors_slicer	4.828 sec	502.305MiB
test_display	1.160 sec	136.836MiB
test_operators_blas	4.164 sec	501.891MiB
test_math_functions	1.874 sec	210.688MiB
test_higherorder	1.748 sec	210.73MiB
test_aggregate	2.976 sec	325.211MiB
test_shapeshifting	4.166 sec	502.066MiB
test_broadcasting	3.409 sec	403.855MiB
test_ufunc	1.732 sec	210.824MiB
test_filling_data	1.241 sec	169.77MiB
test_optimization	1.057 sec	136.797MiB
test_exporting	1.110 sec	136.883MiB

[mratsim]

It seems like there was an issue in 0.20.0 that was fixed in 0.20.2:

test_operators_blas 0.20.0

Hint: operation successful (109082 lines compiled; 11.859 sec total; 952.492MiB peakmem; Debug Build) [SuccessX]

test_operators_blas 0.20.2

Hint: operation successful (128799 lines compiled; 2.194 sec total; 261.719MiB peakmem; Debug Build) [SuccessX]