Effect of lock free QSBR step 5

baseline commit, patch

Speedups (negative means slowdowns):

• parallel_get/1/70000: -3%
• parallel_get/2/70000:
• parallel_get/4/70000:
• parallel_get/8/70000: 23%
• parallel_get/16/70000: 13%
• parallel_get/1/2000000: -1%
• parallel_get/2/2000000: -4%
• parallel_get/4/2000000:
• parallel_get/8/2000000:
• parallel_get/16/2000000:
• parallel_insert_disjoint_ranges/1/70000: -1%
• parallel_insert_disjoint_ranges/2/70000: -0%
• parallel_insert_disjoint_ranges/4/70000:
• parallel_insert_disjoint_ranges/8/70000:
• parallel_insert_disjoint_ranges/16/70000:
• parallel_insert_disjoint_ranges/32/70000:
• parallel_insert_disjoint_ranges/1/2000000:
• parallel_insert_disjoint_ranges/2/2000000:
• parallel_insert_disjoint_ranges/4/2000000:
• parallel_insert_disjoint_ranges/8/2000000:
• parallel_insert_disjoint_ranges/16/2000000:
• parallel_insert_disjoint_ranges/32/2000000:
• parallel_delete_disjoint_ranges/1/70000: 3%
• parallel_delete_disjoint_ranges/2/70000: -2%
• parallel_delete_disjoint_ranges/4/70000: -2%
• parallel_delete_disjoint_ranges/8/70000:
• parallel_delete_disjoint_ranges/16/70000:
• parallel_delete_disjoint_ranges/32/70000:
• parallel_delete_disjoint_ranges/1/2000000: 25%
• parallel_delete_disjoint_ranges/2/2000000: -2%
• parallel_delete_disjoint_ranges/4/2000000: -2%
• parallel_delete_disjoint_ranges/8/2000000:
• parallel_delete_disjoint_ranges/16/2000000:
• parallel_delete_disjoint_ranges/32/2000000: