Add lua Pepperfish Profiler code
Pepperfish Profiler can produce time sampled profiles and call entry exit profiles. Code is verbatim copy from the lua wiki [1]. This commit won't work alone but it exists to give author credit correctly to Daniel. [1] http://lua-users.org/wiki/PepperfishProfiler Authors: Daniel Silverstone <dsilvers@pepperfish.net> Tom Spilman <tom@sickheadgames.com> Ben Wilhelm <zorba-pepperfish@pavlovian.net>develop
Daniel Silverstone
Pauli
parent
02b7f2145f
commit
96ba5116f7
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--[[
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== Introduction ==
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Note that this requires os.clock(), debug.sethook(),
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and debug.getinfo() or your equivalent replacements to
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be available if this is an embedded application.
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Example usage:
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profiler = newProfiler()
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profiler:start()
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< call some functions that take time >
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profiler:stop()
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local outfile = io.open( "profile.txt", "w+" )
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profiler:report( outfile )
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outfile:close()
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== Optionally choosing profiling method ==
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The rest of this comment can be ignored if you merely want a good profiler.
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newProfiler(method, sampledelay):
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If method is omitted or "time", will profile based on real performance.
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optionally, frequency can be provided to control the number of opcodes
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per profiling tick. By default this is 100000, which (on my system) provides
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one tick approximately every 2ms and reduces system performance by about 10%.
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This can be reduced to increase accuracy at the cost of performance, or
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increased for the opposite effect.
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If method is "call", will profile based on function calls. Frequency is
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ignored.
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"time" may bias profiling somewhat towards large areas with "simple opcodes",
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as the profiling function (which introduces a certain amount of unavoidable
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overhead) will be called more often. This can be minimized by using a larger
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sample delay - the default should leave any error largely overshadowed by
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statistical noise. With a delay of 1000 I was able to achieve inaccuray of
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approximately 25%. Increasing the delay to 100000 left inaccuracy below my
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testing error.
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"call" may bias profiling heavily towards areas with many function calls.
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Testing found a degenerate case giving a figure inaccurate by approximately
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20,000%. (Yes, a multiple of 200.) This is, however, more directly comparable
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to common profilers (such as gprof) and also gives accurate function call
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counts, which cannot be retrieved from "time".
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I strongly recommend "time" mode, and it is now the default.
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== History ==
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2008-09-16 - Time-based profiling and conversion to Lua 5.1
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by Ben Wilhelm ( zorba-pepperfish@pavlovian.net ).
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Added the ability to optionally choose profiling methods, along with a new
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profiling method.
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Converted to Lua 5, a few improvements, and
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additional documentation by Tom Spilman ( tom@sickheadgames.com )
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Additional corrections and tidying by original author
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Daniel Silverstone ( dsilvers@pepperfish.net )
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== Status ==
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Daniel Silverstone is no longer using this code, and judging by how long it's
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been waiting for Lua 5.1 support, I don't think Tom Spilman is either. I'm
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perfectly willing to take on maintenance, so if you have problems or
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questions, go ahead and email me :)
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-- Ben Wilhelm ( zorba-pepperfish@pavlovian.net ) '
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== Copyright ==
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Lua profiler - Copyright Pepperfish 2002,2003,2004
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to
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deal in the Software without restriction, including without limitation the
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rights to use, copy, modify, merge, publish, distribute, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to
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do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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--]]
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--
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-- All profiler related stuff is stored in the top level table '_profiler'
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--
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_profiler = {}
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--
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-- newProfiler() creates a new profiler object for managing
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-- the profiler and storing state. Note that only one profiler
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-- object can be executing at one time.
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--
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function newProfiler(variant, sampledelay)
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if _profiler.running then
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print("Profiler already running.")
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return
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end
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variant = variant or "time"
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if variant ~= "time" and variant ~= "call" then
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print("Profiler method must be 'time' or 'call'.")
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return
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end
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local newprof = {}
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for k,v in pairs(_profiler) do
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newprof[k] = v
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end
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newprof.variant = variant
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newprof.sampledelay = sampledelay or 100000
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return newprof
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end
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--
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-- This function starts the profiler. It will do nothing
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-- if this (or any other) profiler is already running.
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--
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function _profiler.start(self)
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if _profiler.running then
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return
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end
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-- Start the profiler. This begins by setting up internal profiler state
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_profiler.running = self
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self.rawstats = {}
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self.callstack = {}
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if self.variant == "time" then
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self.lastclock = os.clock()
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debug.sethook( _profiler_hook_wrapper_by_time, "", self.sampledelay )
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elseif self.variant == "call" then
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debug.sethook( _profiler_hook_wrapper_by_call, "cr" )
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else
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print("Profiler method must be 'time' or 'call'.")
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sys.exit(1)
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end
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end
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--
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-- This function stops the profiler. It will do nothing
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-- if a profiler is not running, and nothing if it isn't
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-- the currently running profiler.
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--
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function _profiler.stop(self)
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if _profiler.running ~= self then
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return
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end
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-- Stop the profiler.
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debug.sethook( nil )
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_profiler.running = nil
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end
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--
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-- Simple wrapper to handle the hook. You should not
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-- be calling this directly. Duplicated to reduce overhead.
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--
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function _profiler_hook_wrapper_by_call(action)
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if _profiler.running == nil then
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debug.sethook( nil )
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end
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_profiler.running:_internal_profile_by_call(action)
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end
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function _profiler_hook_wrapper_by_time(action)
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if _profiler.running == nil then
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debug.sethook( nil )
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end
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_profiler.running:_internal_profile_by_time(action)
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end
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--
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-- This is the main by-function-call function of the profiler and should not
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-- be called except by the hook wrapper
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--
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function _profiler._internal_profile_by_call(self,action)
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-- Since we can obtain the 'function' for the item we've had call us, we
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-- can use that...
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local caller_info = debug.getinfo( 3 )
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if caller_info == nil then
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print "No caller_info"
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return
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end
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--SHG_LOG("[_profiler._internal_profile] "..(caller_info.name or "<nil>"))
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-- Retrieve the most recent activation record...
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local latest_ar = nil
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if table.getn(self.callstack) > 0 then
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latest_ar = self.callstack[table.getn(self.callstack)]
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end
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-- Are we allowed to profile this function?
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local should_not_profile = 0
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for k,v in pairs(self.prevented_functions) do
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if k == caller_info.func then
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should_not_profile = v
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end
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end
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-- Also check the top activation record...
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if latest_ar then
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if latest_ar.should_not_profile == 2 then
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should_not_profile = 2
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end
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end
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-- Now then, are we in 'call' or 'return' ?
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-- print("Profile:", caller_info.name, "SNP:", should_not_profile,
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-- "Action:", action )
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if action == "call" then
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-- Making a call...
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local this_ar = {}
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this_ar.should_not_profile = should_not_profile
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this_ar.parent_ar = latest_ar
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this_ar.anon_child = 0
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this_ar.name_child = 0
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this_ar.children = {}
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this_ar.children_time = {}
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this_ar.clock_start = os.clock()
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-- Last thing to do on a call is to insert this onto the ar stack...
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table.insert( self.callstack, this_ar )
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else
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local this_ar = latest_ar
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if this_ar == nil then
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return -- No point in doing anything if no upper activation record
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end
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-- Right, calculate the time in this function...
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this_ar.clock_end = os.clock()
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this_ar.this_time = this_ar.clock_end - this_ar.clock_start
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-- Now, if we have a parent, update its call info...
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if this_ar.parent_ar then
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this_ar.parent_ar.children[caller_info.func] =
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(this_ar.parent_ar.children[caller_info.func] or 0) + 1
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this_ar.parent_ar.children_time[caller_info.func] =
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(this_ar.parent_ar.children_time[caller_info.func] or 0 ) +
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this_ar.this_time
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if caller_info.name == nil then
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this_ar.parent_ar.anon_child =
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this_ar.parent_ar.anon_child + this_ar.this_time
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else
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this_ar.parent_ar.name_child =
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this_ar.parent_ar.name_child + this_ar.this_time
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end
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end
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-- Now if we're meant to record information about ourselves, do so...
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if this_ar.should_not_profile == 0 then
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local inforec = self:_get_func_rec(caller_info.func,1)
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inforec.count = inforec.count + 1
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inforec.time = inforec.time + this_ar.this_time
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inforec.anon_child_time = inforec.anon_child_time + this_ar.anon_child
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inforec.name_child_time = inforec.name_child_time + this_ar.name_child
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inforec.func_info = caller_info
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for k,v in pairs(this_ar.children) do
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inforec.children[k] = (inforec.children[k] or 0) + v
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inforec.children_time[k] =
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(inforec.children_time[k] or 0) + this_ar.children_time[k]
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end
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end
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-- Last thing to do on return is to drop the last activation record...
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table.remove( self.callstack, table.getn( self.callstack ) )
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end
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end
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--
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-- This is the main by-time internal function of the profiler and should not
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-- be called except by the hook wrapper
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--
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function _profiler._internal_profile_by_time(self,action)
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-- we do this first so we add the minimum amount of extra time to this call
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local timetaken = os.clock() - self.lastclock
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local depth = 3
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local at_top = true
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local last_caller
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local caller = debug.getinfo(depth)
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while caller do
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if not caller.func then caller.func = "(tail call)" end
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if self.prevented_functions[caller.func] == nil then
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local info = self:_get_func_rec(caller.func, 1, caller)
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info.count = info.count + 1
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info.time = info.time + timetaken
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if last_caller then
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-- we're not the head, so update the "children" times also
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if last_caller.name then
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info.name_child_time = info.name_child_time + timetaken
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else
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info.anon_child_time = info.anon_child_time + timetaken
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end
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info.children[last_caller.func] =
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(info.children[last_caller.func] or 0) + 1
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info.children_time[last_caller.func] =
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(info.children_time[last_caller.func] or 0) + timetaken
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end
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end
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depth = depth + 1
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last_caller = caller
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caller = debug.getinfo(depth)
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end
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self.lastclock = os.clock()
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end
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--
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-- This returns a (possibly empty) function record for
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-- the specified function. It is for internal profiler use.
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--
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function _profiler._get_func_rec(self,func,force,info)
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-- Find the function ref for 'func' (if force and not present, create one)
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local ret = self.rawstats[func]
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if ret == nil and force ~= 1 then
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return nil
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end
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if ret == nil then
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-- Build a new function statistics table
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ret = {}
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ret.func = func
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ret.count = 0
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ret.time = 0
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ret.anon_child_time = 0
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ret.name_child_time = 0
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ret.children = {}
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ret.children_time = {}
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ret.func_info = info
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self.rawstats[func] = ret
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end
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return ret
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end
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--
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-- This writes a profile report to the output file object. If
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-- sort_by_total_time is nil or false the output is sorted by
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-- the function time minus the time in it's children.
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--
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function _profiler.report( self, outfile, sort_by_total_time )
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outfile:write
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[[Lua Profile output created by profiler.lua. Copyright Pepperfish 2002+
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]]
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-- This is pretty awful.
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local terms = {}
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if self.variant == "time" then
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terms.capitalized = "Sample"
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terms.single = "sample"
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terms.pastverb = "sampled"
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elseif self.variant == "call" then
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terms.capitalized = "Call"
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terms.single = "call"
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terms.pastverb = "called"
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else
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assert(false)
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end
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local total_time = 0
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local ordering = {}
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for func,record in pairs(self.rawstats) do
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table.insert(ordering, func)
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end
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if sort_by_total_time then
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table.sort( ordering,
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||||||
|
function(a,b) return self.rawstats[a].time > self.rawstats[b].time end
|
||||||
|
)
|
||||||
|
else
|
||||||
|
table.sort( ordering,
|
||||||
|
function(a,b)
|
||||||
|
local arec = self.rawstats[a]
|
||||||
|
local brec = self.rawstats[b]
|
||||||
|
local atime = arec.time - (arec.anon_child_time + arec.name_child_time)
|
||||||
|
local btime = brec.time - (brec.anon_child_time + brec.name_child_time)
|
||||||
|
return atime > btime
|
||||||
|
end
|
||||||
|
)
|
||||||
|
end
|
||||||
|
|
||||||
|
for i=1,table.getn(ordering) do
|
||||||
|
local func = ordering[i]
|
||||||
|
local record = self.rawstats[func]
|
||||||
|
local thisfuncname = " " .. self:_pretty_name(func) .. " "
|
||||||
|
if string.len( thisfuncname ) < 42 then
|
||||||
|
thisfuncname =
|
||||||
|
string.rep( "-", (42 - string.len(thisfuncname))/2 ) .. thisfuncname
|
||||||
|
thisfuncname =
|
||||||
|
thisfuncname .. string.rep( "-", 42 - string.len(thisfuncname) )
|
||||||
|
end
|
||||||
|
|
||||||
|
total_time = total_time + ( record.time - ( record.anon_child_time +
|
||||||
|
record.name_child_time ) )
|
||||||
|
outfile:write( string.rep( "-", 19 ) .. thisfuncname ..
|
||||||
|
string.rep( "-", 19 ) .. "\n" )
|
||||||
|
outfile:write( terms.capitalized.." count: " ..
|
||||||
|
string.format( "%4d", record.count ) .. "\n" )
|
||||||
|
outfile:write( "Time spend total: " ..
|
||||||
|
string.format( "%4.3f", record.time ) .. "s\n" )
|
||||||
|
outfile:write( "Time spent in children: " ..
|
||||||
|
string.format("%4.3f",record.anon_child_time+record.name_child_time) ..
|
||||||
|
"s\n" )
|
||||||
|
local timeinself =
|
||||||
|
record.time - (record.anon_child_time + record.name_child_time)
|
||||||
|
outfile:write( "Time spent in self: " ..
|
||||||
|
string.format("%4.3f", timeinself) .. "s\n" )
|
||||||
|
outfile:write( "Time spent per " .. terms.single .. ": " ..
|
||||||
|
string.format("%4.5f", record.time/record.count) ..
|
||||||
|
"s/" .. terms.single .. "\n" )
|
||||||
|
outfile:write( "Time spent in self per "..terms.single..": " ..
|
||||||
|
string.format( "%4.5f", timeinself/record.count ) .. "s/" ..
|
||||||
|
terms.single.."\n" )
|
||||||
|
|
||||||
|
-- Report on each child in the form
|
||||||
|
-- Child <funcname> called n times and took a.bs
|
||||||
|
local added_blank = 0
|
||||||
|
for k,v in pairs(record.children) do
|
||||||
|
if self.prevented_functions[k] == nil or
|
||||||
|
self.prevented_functions[k] == 0
|
||||||
|
then
|
||||||
|
if added_blank == 0 then
|
||||||
|
outfile:write( "\n" ) -- extra separation line
|
||||||
|
added_blank = 1
|
||||||
|
end
|
||||||
|
outfile:write( "Child " .. self:_pretty_name(k) ..
|
||||||
|
string.rep( " ", 41-string.len(self:_pretty_name(k)) ) .. " " ..
|
||||||
|
terms.pastverb.." " .. string.format("%6d", v) )
|
||||||
|
outfile:write( " times. Took " ..
|
||||||
|
string.format("%4.2f", record.children_time[k] ) .. "s\n" )
|
||||||
|
end
|
||||||
|
end
|
||||||
|
|
||||||
|
outfile:write( "\n" ) -- extra separation line
|
||||||
|
outfile:flush()
|
||||||
|
end
|
||||||
|
outfile:write( "\n\n" )
|
||||||
|
outfile:write( "Total time spent in profiled functions: " ..
|
||||||
|
string.format("%5.3g",total_time) .. "s\n" )
|
||||||
|
outfile:write( [[
|
||||||
|
|
||||||
|
END
|
||||||
|
]] )
|
||||||
|
outfile:flush()
|
||||||
|
end
|
||||||
|
|
||||||
|
|
||||||
|
--
|
||||||
|
-- This writes the profile to the output file object as
|
||||||
|
-- loadable Lua source.
|
||||||
|
--
|
||||||
|
function _profiler.lua_report(self,outfile)
|
||||||
|
-- Purpose: Write out the entire raw state in a cross-referenceable form.
|
||||||
|
local ordering = {}
|
||||||
|
local functonum = {}
|
||||||
|
for func,record in pairs(self.rawstats) do
|
||||||
|
table.insert(ordering, func)
|
||||||
|
functonum[func] = table.getn(ordering)
|
||||||
|
end
|
||||||
|
|
||||||
|
outfile:write(
|
||||||
|
"-- Profile generated by profiler.lua Copyright Pepperfish 2002+\n\n" )
|
||||||
|
outfile:write( "-- Function names\nfuncnames = {}\n" )
|
||||||
|
for i=1,table.getn(ordering) do
|
||||||
|
local thisfunc = ordering[i]
|
||||||
|
outfile:write( "funcnames[" .. i .. "] = " ..
|
||||||
|
string.format("%q", self:_pretty_name(thisfunc)) .. "\n" )
|
||||||
|
end
|
||||||
|
outfile:write( "\n" )
|
||||||
|
outfile:write( "-- Function times\nfunctimes = {}\n" )
|
||||||
|
for i=1,table.getn(ordering) do
|
||||||
|
local thisfunc = ordering[i]
|
||||||
|
local record = self.rawstats[thisfunc]
|
||||||
|
outfile:write( "functimes[" .. i .. "] = { " )
|
||||||
|
outfile:write( "tot=" .. record.time .. ", " )
|
||||||
|
outfile:write( "achild=" .. record.anon_child_time .. ", " )
|
||||||
|
outfile:write( "nchild=" .. record.name_child_time .. ", " )
|
||||||
|
outfile:write( "count=" .. record.count .. " }\n" )
|
||||||
|
end
|
||||||
|
outfile:write( "\n" )
|
||||||
|
outfile:write( "-- Child links\nchildren = {}\n" )
|
||||||
|
for i=1,table.getn(ordering) do
|
||||||
|
local thisfunc = ordering[i]
|
||||||
|
local record = self.rawstats[thisfunc]
|
||||||
|
outfile:write( "children[" .. i .. "] = { " )
|
||||||
|
for k,v in pairs(record.children) do
|
||||||
|
if functonum[k] then -- non-recorded functions will be ignored now
|
||||||
|
outfile:write( functonum[k] .. ", " )
|
||||||
|
end
|
||||||
|
end
|
||||||
|
outfile:write( "}\n" )
|
||||||
|
end
|
||||||
|
outfile:write( "\n" )
|
||||||
|
outfile:write( "-- Child call counts\nchildcounts = {}\n" )
|
||||||
|
for i=1,table.getn(ordering) do
|
||||||
|
local thisfunc = ordering[i]
|
||||||
|
local record = self.rawstats[thisfunc]
|
||||||
|
outfile:write( "children[" .. i .. "] = { " )
|
||||||
|
for k,v in record.children do
|
||||||
|
if functonum[k] then -- non-recorded functions will be ignored now
|
||||||
|
outfile:write( v .. ", " )
|
||||||
|
end
|
||||||
|
end
|
||||||
|
outfile:write( "}\n" )
|
||||||
|
end
|
||||||
|
outfile:write( "\n" )
|
||||||
|
outfile:write( "-- Child call time\nchildtimes = {}\n" )
|
||||||
|
for i=1,table.getn(ordering) do
|
||||||
|
local thisfunc = ordering[i]
|
||||||
|
local record = self.rawstats[thisfunc];
|
||||||
|
outfile:write( "children[" .. i .. "] = { " )
|
||||||
|
for k,v in pairs(record.children) do
|
||||||
|
if functonum[k] then -- non-recorded functions will be ignored now
|
||||||
|
outfile:write( record.children_time[k] .. ", " )
|
||||||
|
end
|
||||||
|
end
|
||||||
|
outfile:write( "}\n" )
|
||||||
|
end
|
||||||
|
outfile:write( "\n\n-- That is all.\n\n" )
|
||||||
|
outfile:flush()
|
||||||
|
end
|
||||||
|
|
||||||
|
-- Internal function to calculate a pretty name for the profile output
|
||||||
|
function _profiler._pretty_name(self,func)
|
||||||
|
|
||||||
|
-- Only the data collected during the actual
|
||||||
|
-- run seems to be correct.... why?
|
||||||
|
local info = self.rawstats[ func ].func_info
|
||||||
|
-- local info = debug.getinfo( func )
|
||||||
|
|
||||||
|
local name = ""
|
||||||
|
if info.what == "Lua" then
|
||||||
|
name = "L:"
|
||||||
|
end
|
||||||
|
if info.what == "C" then
|
||||||
|
name = "C:"
|
||||||
|
end
|
||||||
|
if info.what == "main" then
|
||||||
|
name = " :"
|
||||||
|
end
|
||||||
|
|
||||||
|
if info.name == nil then
|
||||||
|
name = name .. "<"..tostring(func) .. ">"
|
||||||
|
else
|
||||||
|
name = name .. info.name
|
||||||
|
end
|
||||||
|
|
||||||
|
if info.source then
|
||||||
|
name = name .. "@" .. info.source
|
||||||
|
else
|
||||||
|
if info.what == "C" then
|
||||||
|
name = name .. "@?"
|
||||||
|
else
|
||||||
|
name = name .. "@<string>"
|
||||||
|
end
|
||||||
|
end
|
||||||
|
name = name .. ":"
|
||||||
|
if info.what == "C" then
|
||||||
|
name = name .. "?"
|
||||||
|
else
|
||||||
|
name = name .. info.linedefined
|
||||||
|
end
|
||||||
|
|
||||||
|
return name
|
||||||
|
end
|
||||||
|
|
||||||
|
|
||||||
|
--
|
||||||
|
-- This allows you to specify functions which you do
|
||||||
|
-- not want profiled. Setting level to 1 keeps the
|
||||||
|
-- function from being profiled. Setting level to 2
|
||||||
|
-- keeps both the function and its children from
|
||||||
|
-- being profiled.
|
||||||
|
--
|
||||||
|
-- BUG: 2 will probably act exactly like 1 in "time" mode.
|
||||||
|
-- If anyone cares, let me (zorba) know and it can be fixed.
|
||||||
|
--
|
||||||
|
function _profiler.prevent(self, func, level)
|
||||||
|
self.prevented_functions[func] = (level or 1)
|
||||||
|
end
|
||||||
|
|
||||||
|
|
||||||
|
_profiler.prevented_functions = {
|
||||||
|
[_profiler.start] = 2,
|
||||||
|
[_profiler.stop] = 2,
|
||||||
|
[_profiler._internal_profile_by_time] = 2,
|
||||||
|
[_profiler._internal_profile_by_call] = 2,
|
||||||
|
[_profiler_hook_wrapper_by_time] = 2,
|
||||||
|
[_profiler_hook_wrapper_by_call] = 2,
|
||||||
|
[_profiler.prevent] = 2,
|
||||||
|
[_profiler._get_func_rec] = 2,
|
||||||
|
[_profiler.report] = 2,
|
||||||
|
[_profiler.lua_report] = 2,
|
||||||
|
[_profiler._pretty_name] = 2
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue