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local profile = require"jit.profile"
local function start(period,file)
local function cb(thread,samples,vmstate)
file:write(profile.dumpstack(thread,"pF l;",-100), vmstate, " ", samples, "\n")
end
profile.start("vli"..tonumber(period), cb)
end
local function stop() profile.stop() end
return {start=start,stop=stop}
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