about 1,700 attendees in 2000 to about 300 in 2019. Although significantly smaller, attendance at that scale is generally considered reasonable and comparable to that of other academic systems research conferences, such as .

In 2020, ATC was held virtually due to the COVID-19 pandemic. Since 2021, USENIX has co-located ATC with OSDI. Although attendees could freely move between the technical sessions of the two conferences and thus effectively attend both, USENIX required registrants to choose