send bursts of queries in parallel to reduce test runtime

sending each group of queries simultaneously, and then checking the
output after the last one finishes, reduces the runtime of the
serve-stale test by about six minutes.

(cherry picked from commit 195d25b222)
This commit is contained in:
Evan Hunt
2020-02-19 18:26:48 -08:00
parent 817e2aaf14
commit 8d3efd031b
3 changed files with 314 additions and 253 deletions

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