ZAP_HISTOGRAM_SIZE
dump_histogram(zs.zs_leafs_with_2n_pointers, ZAP_HISTOGRAM_SIZE, 0);
dump_histogram(zs.zs_blocks_with_n5_entries, ZAP_HISTOGRAM_SIZE, 0);
dump_histogram(zs.zs_blocks_n_tenths_full, ZAP_HISTOGRAM_SIZE, 0);
dump_histogram(zs.zs_entries_using_n_chunks, ZAP_HISTOGRAM_SIZE, 0);
dump_histogram(zs.zs_buckets_with_n_entries, ZAP_HISTOGRAM_SIZE, 0);
uint64_t zs_leafs_with_2n_pointers[ZAP_HISTOGRAM_SIZE];
uint64_t zs_blocks_with_n5_entries[ZAP_HISTOGRAM_SIZE];
uint64_t zs_blocks_n_tenths_full[ZAP_HISTOGRAM_SIZE];
uint64_t zs_entries_using_n_chunks[ZAP_HISTOGRAM_SIZE];
uint64_t zs_buckets_with_n_entries[ZAP_HISTOGRAM_SIZE];
n = MIN(n, ZAP_HISTOGRAM_SIZE-1);
n = MIN(n, ZAP_HISTOGRAM_SIZE-1);
n = MIN(n, ZAP_HISTOGRAM_SIZE-1);
n = MIN(n, ZAP_HISTOGRAM_SIZE-1);
n = MIN(n, ZAP_HISTOGRAM_SIZE-1);