108 lines
3.2 KiB
Lua
108 lines
3.2 KiB
Lua
local Util = require 'Util'
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local Common = require 'Common'
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local Geometry = require 'Geometry'
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local func = require 'func'
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return function(update_freq)
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local PLOT_SEC_BREAK = 20
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local PLOT_HEIGHT = 56
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local DEVICES = {'sda', 'nvme0n1'}
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-- the sector size of any block device in linux is 512 bytes
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-- see https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/types.h?id=v4.4-rc6#n121
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local BLOCK_SIZE_BYTES = 512
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-- fields 3 and 7 (sectors read and written)
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local RW_REGEX = '%s+%d+%s+%d+%s+(%d+)%s+%d+%s+%d+%s+%d+%s+(%d+)'
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local __tonumber = tonumber
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local __string_match = string.match
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-- TODO any way to make better lambda functions?
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local DEVICE_PATHS = func.map(
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function(s) return string.format('/sys/block/%s/stat', s) end,
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DEVICES
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)
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local read_devices = function()
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local read_bytes = 0
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local write_bytes = 0
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for _, path in pairs(DEVICE_PATHS) do
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local r, w = __string_match(Util.read_file(path), RW_REGEX)
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read_bytes = read_bytes + __tonumber(r)
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write_bytes = write_bytes + __tonumber(w)
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end
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return read_bytes * BLOCK_SIZE_BYTES, write_bytes * BLOCK_SIZE_BYTES
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end
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local init_read_bytes, init_write_bytes = read_devices()
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local format_value_function = function(bps)
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local unit, value = Util.convert_data_val(bps)
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return Util.precision_round_to_string(value, 3)..' '..unit..'B/s'
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end
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local build_plot = function(y, label, init)
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return Common.build_rate_timeseries(
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Geometry.CENTER_LEFT_X,
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y,
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Geometry.SECTION_WIDTH,
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PLOT_HEIGHT,
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format_value_function,
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Common.converted_y_label_format_generator('B'),
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PLOT_SEC_BREAK,
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label,
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2,
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update_freq,
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init
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)
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end
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-----------------------------------------------------------------------------
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-- header
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local header = Common.Header(
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Geometry.CENTER_LEFT_X,
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Geometry.TOP_Y,
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Geometry.SECTION_WIDTH,
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'INPUT / OUTPUT'
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)
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-----------------------------------------------------------------------------
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-- reads
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local reads = build_plot(header.bottom_y, 'Reads', init_read_bytes)
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-----------------------------------------------------------------------------
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-- writes
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local writes = build_plot(
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header.bottom_y + PLOT_HEIGHT + PLOT_SEC_BREAK * 2,
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'Writes',
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init_write_bytes
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)
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-----------------------------------------------------------------------------
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-- main drawing functions
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local update = function(cr)
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local read_bytes, write_bytes = read_devices()
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Common.update_rate_timeseries(reads, cr, read_bytes)
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Common.update_rate_timeseries(writes, cr, write_bytes)
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end
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local draw_static = function(cr)
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Common.drawHeader(cr, header)
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Common.annotated_scale_plot_draw_static(reads, cr)
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Common.annotated_scale_plot_draw_static(writes, cr)
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end
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local draw_dynamic = function(cr)
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update(cr)
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Common.annotated_scale_plot_draw_dynamic(reads, cr)
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Common.annotated_scale_plot_draw_dynamic(writes, cr)
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end
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return {static = draw_static, dynamic = draw_dynamic}
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end
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