when when rollup dies with cache:
{ rss: 154533888, heapTotal: 125739008, heapUsed: 91440776 },
{ rss: 373751808, heapTotal: 345399296, heapUsed: 241697880 },
{ rss: 392359936, heapTotal: 365342720, heapUsed: 317458824 },
{ rss: 593084416, heapTotal: 563167232, heapUsed: 510649792 },
{ rss: 790614016, heapTotal: 759365632, heapUsed: 708062936 },
{ rss: 668528640, heapTotal: 634781696, heapUsed: 455590688 },