Hi, G1-style heap region printout (e.g. in hs_err_*) is nice and compact, let Shenandoah do the same: http://cr.openjdk.java.net/~shade/shenandoah/shr-print-line/webrev.01/ Sample hs_err: http://cr.openjdk.java.net/~shade/shenandoah/shr-print-line/hs_err_pid31766.log Thanks, -Aleksey