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The discovery of fast radio burst (FRB) 200428 from galactic SGR J1935+2154makes it possible to measure rotational changes accompanied by FRBs and to testseveral FRB models which may be simultaneously associated with glitches.Inspired by this idea, we present order of magnitude calculations to thescenarios proposed. FRB models such as global starquakes, crust fractures andcollisions between pulsars and asteroids/comets are discussed. For eachmechanism, the maximum glitch sizes are constrained by the isotropic energyrelease during the X-ray burst and/or the SGR J1935+2154-like radio burst rate.Brief calculations show that, the maximum glitch sizes for different mechanismsdiffer by order(s) of magnitude. If glitches are detected to be coincident withFRBs from galactic magnetars in the future, glitch behaviors (such as glitchsize, rise timescale, the recovery coefficient and spin down rate offset) arepromising to serve as criterions to distinguish glitch mechanisms and in turnto constrain FRB models.

Constraining mechanism associated with fast radio burst and glitch from SGR J1935