UShER performance statistics, SARS-CoV-2 daily builds 2021-2023

For each day from 2021-01-07 through 2023-08-01 on which the daily build update of the UShER tree of SARS-CoV-2 genomes completed, the number of new sequences added to the tree, the number of sequences in the updated tree, the number of parallel usher jobs (original usher through 2022-04-27, usher-sampled starting 2022-04-29), the number of CPU cores per usher job, and approximate runtime of the usher batch in hours are listed. The number of sequences in the updated tree is "n/a" for most dates prior to 2021-03-11 because before that point, daily updates were for the public-sequence-only tree and the comprehensive GISAID and public sequence tree was updated only occasionally. On and after 2021-03-11, the comprehensive tree and public tree were updated daily. The runtime figures are approximate because they are calculated by subtracting the file modification date of the VCF input to usher from the file modification date of the MAT output of usher. On most days, that was a good proxy for usher runtime, but occasionally there was a crash that required debugging and/or restart, and the "runtime" includes those delays.