  We consider a microcanonical local algorithm to be applied on the $\pm J$
spin glass model. We have compared the results coming from a microcanonical
Monte Carlo simulation with those from a canonical one: Thermalization times,
spin glass susceptibilities and Binder parameters. For a fixed lattice size we
found different results between the two thermodynamic ensembles, which tend to
vanish at bigger volumes. Moreover, microcanonical thermalization times are
longer than the canonical ones. Finally we have checked that one of the Guerra
relations is satisfied with good precision for the two largest lattices.
