.. _config_ref tasks make_membrane_system diagnose_differential_stress:

``diagnose_differential_stress``
================================

After assembling a stress-free asymmetric membrane, run a short tensionless pressure-profile pass and report the residual per-leaflet surface tensions, their difference (the differential stress), and the leaflet-count adjustment that would null it. Diagnostic only; the membrane is not rebuilt. Requires a CPU (non-CUDA) NAMD build.

Single-valued attributes:

  * ``enabled``: turn on the differential-stress diagnostic for asymmetric builds (default: False)

  * ``nsteps``: number of MD steps in the tensionless pressure-profile pass (default: 100000)

  * ``slabs``: number of z-slabs for the pressure profile (pressureProfileSlabs) (default: 40)

  * ``freq``: steps between pressure-profile samples (pressureProfileFreq) (default: 500)

  * ``area_modulus``: assumed per-leaflet area-compressibility modulus K_A (mN/m), used to convert the residual differential stress into a suggested leaflet-count change (default: 250.0)



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