Cache indices and coefficients vectors between constraints

[odow]

No description provided.

[codecov]

Codecov Report

Merging #201 (4e0ea09) into master (5982ae9) will increase coverage by 0.16%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #201      +/-   ##
==========================================
+ Coverage   82.85%   83.01%   +0.16%     
==========================================
  Files           9        9              
  Lines        1761     1766       +5     
==========================================
+ Hits         1459     1466       +7     
+ Misses        302      300       -2     

Impacted Files	Coverage Δ
src/MOI_wrapper/MOI_callbacks.jl	95.78% <100.00%> (ø)
src/MOI_wrapper/MOI_wrapper.jl	92.29% <100.00%> (+0.25%)	⬆️

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[joaquimg]

What is the underlying issue?
Things are being Garbage Collected? if so, shouldn't the solution be: Base.GC.@preserve ?

[joaquimg]

Or the issue is allocating vectors?

[odow]

Yes I wondered if it was the source of jump-dev/JuMP.jl#2817. The answer is somewhat, but there must be another culprit. I need to do a better benchmark before merging.