Instrument environment for performance evaluation

[cprudhom]

Environment could provide indicators on:

• allocated space,
• used space,
• resize frequency.

These parameters should help user to determine which configuration is the more adapter to its problem:

• CHUNCKED is adapted to large-scale problem in which huge space is needed and allocating it in one shot is critical
• FLATTEN is adapted to low-memory consumption problem.

Each of them should be accurately configured wrt to the analysis of the parameters