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Merge pull request #16564 from glacambre/improve_test_harness_perf

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test(helpers): optimize read_file_list
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James McCoy 2021-12-09 21:06:45 -05:00 committed by GitHub
commit 27648ee218
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1 changed files with 13 additions and 1 deletions
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14
test/helpers.lua
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@ -741,9 +741,20 @@ function module.read_file_list(filename, start)
if not file then if not file then
return nil return nil
end end
-- There is no need to read more than the last 2MB of the log file, so seek
-- to that.
local file_size = file:seek("end")
local offset = file_size - 2000000
if offset < 0 then
offset = 0
end
file:seek("set", offset)
local lines = {} local lines = {}
local i = 1 local i = 1
for line in file:lines() do local line = file:read("*l")
while line ~= nil do
if i >= start then if i >= start then
table.insert(lines, line) table.insert(lines, line)
if #lines > maxlines then if #lines > maxlines then
@ -751,6 +762,7 @@ function module.read_file_list(filename, start)
end end
end end
i = i + 1 i = i + 1
line = file:read("*l")
end end
file:close() file:close()
return lines return lines