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gluon-status-page: avoid complex math

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This code is usually running on an embedded CPU without FPU. In
addtition to its inefficience, the algorithm is also much harder to
understand.

Replace the logarithm formula with a simple loop.

(cherry picked from commit f2e0f7e3a8)
This commit is contained in:
Matthias Schiffer 2021-08-07 21:02:32 +02:00
parent b03e1e280e
commit cc20271cb8
1 changed files with 9 additions and 4 deletions
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13
package/gluon-status-page/files/lib/gluon/status-page/view/status-page.html
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@ -66,12 +66,17 @@
local function formatBits(bits)
local units = {[0]='', 'k', 'M', 'G'}
local unit = 0
local pow = math.floor(math.log(math.max(math.abs(bits), 1)) / math.log(1000))
local known_pow = math.min(pow, #units)
for i = 1, #units do
if math.abs(bits) < 1000 then
break
end
unit = i
bits = bits / 1000
end
local significand = bits/(1000^known_pow)
return string.format('%g %sbit', significand, units[known_pow])
return string.format('%g %sbit', bits, units[unit])
end
local function statistics(key, format)