Re: [Cs-dev] Vectorization

Date	2008-04-17 12:56
From	"Michael Gogins"
Subject	Re: [Cs-dev] Vectorization
	gprof csound64.dll.5.1 > profile.txt I.e. you profile the Csound library as that is the running binary, not the Csound application. Regards, Mike ----- Original Message ----- From: "Victor Lazzarini" To: "Developer discussions" Sent: Thursday, April 17, 2008 6:03 AM Subject: Re: [Cs-dev] Vectorization > That is essentially what I did (without the tree thing, just getting gprof > to > output a flat profile). But no luck. > > Victor > > At 01:21 17/04/2008, you wrote: >>Hi Victor, >> >>I haven't done it in a long time, but I found an email I posted to the >>dev list a year and a half ago that has some instructions: >> >>http://www.nabble.com/Call-Graph-%28Postscript-file%29-td5730328.html#a5730328 >> >>I haven't run it in a long while but those commands that were run >>there should do the trick. >> >>steven >> >>On Wed, Apr 16, 2008 at 12:33 PM, victor wrote: >> > I built csound with useGprof=1, run a simple one-oscillator test, then >> > tried gprof and got an empty profile. Why is that? >> > >> > >> > ----- Original Message ----- >> > From: "Steven Yi" >> > >> > To: "Michael Gogins" ; "Developer discussions" >> > >> > >> > >> > Sent: Wednesday, April 16, 2008 7:42 PM >> > Subject: Re: [Cs-dev] Vectorization >> > >> > >> > > Hi Michael, >> > > >> > > I'm interested in the profiling results; what profiler are you using >> > > by the way? I remember doing profiling a while back using debug >> > > builds and gprof (the options for that are still in SConstruct), but >> > > when I did profiling it was more for to try to figure out why the >> > > Pinkston FM model was really slow at the time, not so much for >> > general >> > > Csound performance. >> > > >> > > I've poked around most of Csound's engine and feel like I know it >> > > pretty well, especially when I was more actively working on the new >> > > parser. If there's any questions that arise about Csound internals >> > > and how things are allocated, I'd suggest looking at the new parser >> > > (well, the compile part that translates the AST to the INSTRTXT data >> > > structs that Csound uses at performance time) to see how things are >> > > built, as to me it's a bit clearer than reading the old parser code. >> > > >> > > steven >> > > >> > > >> > > On Wed, Apr 16, 2008 at 11:27 AM, Michael Gogins >> > >> > > wrote: >> > >> Yes, this is interesting. I have not yet tried unsafe math >> optimizations, >> > >> but will. >> > >> >> > >> I have tried inlining as much code as possible, which in practice >> means >> > >> defining all C++ member functions in the header file. That >> > consistently >> > >> produces somewhere between 5% and 15% speedups, right there. >> > >> >> > >> This in is the context of intermittently continuing development of >> > >> Silence, an algorithmic composition/software synthesis library of >> my own >> > >> design. Currently, Silence renders audio just slightly faster than >> > >> Csound, but this is with hard-coded STK Rhodey C++ instruments. >> > (But >> > >> then, my comparison Csound instrument uses the STK Rhodey opcode >> also, so >> > >> the comparison is more fair than it might seem: it mostly compares >> > >> instrument allocation and event dispatching). Dynamically defined >> > >> instruments will be slower in Silence, perhaps also in Csound >> > (i.e., >> > >> using more opcodes in the instr block instead of just calling one >> opcode >> > >> that does all the work). I shall soon know more, as I have >> > finalized my >> > >> design of dynamically defined instruments and unit generators in >> Silence. >> > >> >> > >> It is the usefulness of the profiler in getting this performance >> > that >> > >> has decided me to profile Csound. I am very curious to see how much >> > >> "slack" there is, how much scope for performance improvements. Most >> > of >> > >> Csound's opcodes code looks to be quite efficient, and I am >> certainly not >> > >> going to monkey with the fundamental design of the engine, so I am >> > most >> > >> curious about the efficiency of the engine implementation, >> especially the >> > >> kperf loop, event initializers, output drivers, and so on. I don't, >> > >> actually, expect much slack but the profiler will, perhaps, point >> > out a >> > >> few areas that have not been completely thought through. >> > >> >> > >> Regards, >> > >> Mike >> > >> >> > >> >> > >> >> > >> -----Original Message----- >> > >> >From: Steven Yi >> > >> >Sent: Apr 16, 2008 12:00 PM >> > >> >To: Developer discussions >> > >> >Subject: [Cs-dev] Vectorization >> > >> > >> > >> >Hi All, >> > >> > >> > >> >There's an interesting thread going on on linux-audio-dev about >> > the >> > >> >performance of gcc vectorization code: >> > >> > >> > >> >http://www.nabble.com/vectorization-td15339532.html#a16720581 >> > >> > >> > >> >The thread started in February but resumed a day or two ago, with >> > >> >someone reporting better results with gcc than using assembly. >> > >> > >> > >> >steven >> > >> > >> > >> >> > >> >> >> >------------------------------------------------------------------------- >> > >> >This SF.net email is sponsored by the 2008 JavaOne(SM) Conference >> > >> >Don't miss this year's exciting event. There's still time to save >> $100. >> > >> >Use priority code J8TL2D2. >> > >> >> > >> >> >> >http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone >> > >> >_______________________________________________ >> > >> >Csound-devel mailing list >> > >> >Csound-devel@lists.sourceforge.net >> > >> >https://lists.sourceforge.net/lists/listinfo/csound-devel >> > >> >> > >> >> > >> >> > >> >> > >> >> ------------------------------------------------------------------------- >> > >> This SF.net email is sponsored by the 2008 JavaOne(SM) Conference >> > >> Don't miss this year's exciting event. There's still time to save >> $100. >> > >> Use priority code J8TL2D2. >> > >> >> > >> >> http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone >> > >> _______________________________________________ >> > >> Csound-devel mailing list >> > >> Csound-devel@lists.sourceforge.net >> > >> https://lists.sourceforge.net/lists/listinfo/csound-devel >> > >> >> > > >> > > >> ------------------------------------------------------------------------- >> > > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference >> > > Don't miss this year's exciting event. There's still time to save >> > $100. >> > > Use priority code J8TL2D2. >> > > >> http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone >> > > _______________________________________________ >> > > Csound-devel mailing list >> > > Csound-devel@lists.sourceforge.net >> > > https://lists.sourceforge.net/lists/listinfo/csound-devel >> > >> > >> >> > ------------------------------------------------------------------------- >> > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference >> > Don't miss this year's exciting event. There's still time to save >> > $100. >> > Use priority code J8TL2D2. >> > >> http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone >> > _______________________________________________ >> > Csound-devel mailing list >> > Csound-devel@lists.sourceforge.net >> > https://lists.sourceforge.net/lists/listinfo/csound-devel >> > >> >>------------------------------------------------------------------------- >>This SF.net email is sponsored by the 2008 JavaOne(SM) Conference >>Don't miss this year's exciting event. There's still time to save $100. >>Use priority code J8TL2D2. >>http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone >>_______________________________________________ >>Csound-devel mailing list >>Csound-devel@lists.sourceforge.net >>https://lists.sourceforge.net/lists/listinfo/csound-devel > > Victor Lazzarini > Music Technology Laboratory > Music Department > National University of Ireland, Maynooth > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > Don't miss this year's exciting event. There's still time to save $100. > Use priority code J8TL2D2. > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > _______________________________________________ > Csound-devel mailing list > Csound-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/csound-devel ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Csound-devel mailing list Csound-devel@lists.sourceforge.net

Date	2008-04-17 14:42
From	Victor Lazzarini
Subject	Re: [Cs-dev] Vectorization
	aha. Thanks Victor At 12:56 17/04/2008, you wrote: >gprof csound64.dll.5.1 > profile.txt > >I.e. you profile the Csound library as that is the running binary, not the >Csound application. > >Regards, >Mike > >----- Original Message ----- >From: "Victor Lazzarini" >To: "Developer discussions" >Sent: Thursday, April 17, 2008 6:03 AM >Subject: Re: [Cs-dev] Vectorization > > > > That is essentially what I did (without the tree thing, just getting gprof > > to > > output a flat profile). But no luck. > > > > Victor > > > > At 01:21 17/04/2008, you wrote: > >>Hi Victor, > >> > >>I haven't done it in a long time, but I found an email I posted to the > >>dev list a year and a half ago that has some instructions: > >> > >>http://www.nabble.com/Call-Graph-%28Postscript-file%29-td5730328.html#a5 > 730328 > >> > >>I haven't run it in a long while but those commands that were run > >>there should do the trick. > >> > >>steven > >> > >>On Wed, Apr 16, 2008 at 12:33 PM, victor wrote: > >> > I built csound with useGprof=1, run a simple one-oscillator test, then > >> > tried gprof and got an empty profile. Why is that? > >> > > >> > > >> > ----- Original Message ----- > >> > From: "Steven Yi" > >> > > >> > To: "Michael Gogins" ; "Developer discussions" > >> > > >> > > >> > > >> > Sent: Wednesday, April 16, 2008 7:42 PM > >> > Subject: Re: [Cs-dev] Vectorization > >> > > >> > > >> > > Hi Michael, > >> > > > >> > > I'm interested in the profiling results; what profiler are you using > >> > > by the way? I remember doing profiling a while back using debug > >> > > builds and gprof (the options for that are still in SConstruct), but > >> > > when I did profiling it was more for to try to figure out why the > >> > > Pinkston FM model was really slow at the time, not so much for > >> > general > >> > > Csound performance. > >> > > > >> > > I've poked around most of Csound's engine and feel like I know it > >> > > pretty well, especially when I was more actively working on the new > >> > > parser. If there's any questions that arise about Csound internals > >> > > and how things are allocated, I'd suggest looking at the new parser > >> > > (well, the compile part that translates the AST to the INSTRTXT data > >> > > structs that Csound uses at performance time) to see how things are > >> > > built, as to me it's a bit clearer than reading the old parser code. > >> > > > >> > > steven > >> > > > >> > > > >> > > On Wed, Apr 16, 2008 at 11:27 AM, Michael Gogins > >> > > >> > > wrote: > >> > >> Yes, this is interesting. I have not yet tried unsafe math > >> optimizations, > >> > >> but will. > >> > >> > >> > >> I have tried inlining as much code as possible, which in practice > >> means > >> > >> defining all C++ member functions in the header file. That > >> > consistently > >> > >> produces somewhere between 5% and 15% speedups, right there. > >> > >> > >> > >> This in is the context of intermittently continuing development of > >> > >> Silence, an algorithmic composition/software synthesis library of > >> my own > >> > >> design. Currently, Silence renders audio just slightly faster than > >> > >> Csound, but this is with hard-coded STK Rhodey C++ instruments. > >> > (But > >> > >> then, my comparison Csound instrument uses the STK Rhodey opcode > >> also, so > >> > >> the comparison is more fair than it might seem: it mostly compares > >> > >> instrument allocation and event dispatching). Dynamically defined > >> > >> instruments will be slower in Silence, perhaps also in Csound > >> > (i.e., > >> > >> using more opcodes in the instr block instead of just calling one > >> opcode > >> > >> that does all the work). I shall soon know more, as I have > >> > finalized my > >> > >> design of dynamically defined instruments and unit generators in > >> Silence. > >> > >> > >> > >> It is the usefulness of the profiler in getting this performance > >> > that > >> > >> has decided me to profile Csound. I am very curious to see how much > >> > >> "slack" there is, how much scope for performance improvements. Most > >> > of > >> > >> Csound's opcodes code looks to be quite efficient, and I am > >> certainly not > >> > >> going to monkey with the fundamental design of the engine, so I am > >> > most > >> > >> curious about the efficiency of the engine implementation, > >> especially the > >> > >> kperf loop, event initializers, output drivers, and so on. I don't, > >> > >> actually, expect much slack but the profiler will, perhaps, point > >> > out a > >> > >> few areas that have not been completely thought through. > >> > >> > >> > >> Regards, > >> > >> Mike > >> > >> > >> > >> > >> > >> > >> > >> -----Original Message----- > >> > >> >From: Steven Yi > >> > >> >Sent: Apr 16, 2008 12:00 PM > >> > >> >To: Developer discussions > >> > >> >Subject: [Cs-dev] Vectorization > >> > >> > > >> > >> >Hi All, > >> > >> > > >> > >> >There's an interesting thread going on on linux-audio-dev about > >> > the > >> > >> >performance of gcc vectorization code: > >> > >> > > >> > >> >http://www.nabble.com/vectorization-td15339532.html#a16720581 > >> > >> > > >> > >> >The thread started in February but resumed a day or two ago, with > >> > >> >someone reporting better results with gcc than using assembly. > >> > >> > > >> > >> >steven > >> > >> > > >> > >> > >> > >> > >> > >> > >------------------------------------------------------------------------- > >> > >> >This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > >> > >> >Don't miss this year's exciting event. There's still time to save > >> $100. > >> > >> >Use priority code J8TL2D2. > >> > >> > >> > >> > >> > >> > >http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > >> > >> >_______________________________________________ > >> > >> >Csound-devel mailing list > >> > >> >Csound-devel@lists.sourceforge.net > >> > >> >https://lists.sourceforge.net/lists/listinfo/csound-devel > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> ------------------------------------------------------------------------- > >> > >> This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > >> > >> Don't miss this year's exciting event. There's still time to save > >> $100. > >> > >> Use priority code J8TL2D2. > >> > >> > >> > >> > >> > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > >> > >> _______________________________________________ > >> > >> Csound-devel mailing list > >> > >> Csound-devel@lists.sourceforge.net > >> > >> https://lists.sourceforge.net/lists/listinfo/csound-devel > >> > >> > >> > > > >> > > > >> ------------------------------------------------------------------------- > >> > > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > >> > > Don't miss this year's exciting event. There's still time to save > >> > $100. > >> > > Use priority code J8TL2D2. > >> > > > >> > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > >> > > _______________________________________________ > >> > > Csound-devel mailing list > >> > > Csound-devel@lists.sourceforge.net > >> > > https://lists.sourceforge.net/lists/listinfo/csound-devel > >> > > >> > > >> > >> > > ------------------------------------------------------------------------- > >> > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > >> > Don't miss this year's exciting event. There's still time to save > >> > $100. > >> > Use priority code J8TL2D2. > >> > > >> > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > >> > _______________________________________________ > >> > Csound-devel mailing list > >> > Csound-devel@lists.sourceforge.net > >> > https://lists.sourceforge.net/lists/listinfo/csound-devel > >> > > >> > >>------------------------------------------------------------------------- > >>This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > >>Don't miss this year's exciting event. There's still time to save $100. > >>Use priority code J8TL2D2. > >>http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/j > avaone > >>_______________________________________________ > >>Csound-devel mailing list > >>Csound-devel@lists.sourceforge.net > >>https://lists.sourceforge.net/lists/listinfo/csound-devel > > > > Victor Lazzarini > > Music Technology Laboratory > > Music Department > > National University of Ireland, Maynooth > > > > > > ------------------------------------------------------------------------- > > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > > Don't miss this year's exciting event. There's still time to save $100. > > Use priority code J8TL2D2. > > > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > > _______________________________________________ > > Csound-devel mailing list > > Csound-devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/csound-devel > > >------------------------------------------------------------------------- >This SF.net email is sponsored by the 2008 JavaOne(SM) Conference >Don't miss this year's exciting event. There's still time to save $100. >Use priority code J8TL2D2. >http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone >_______________________________________________ >Csound-devel mailing list >Csound-devel@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/csound-devel Victor Lazzarini Music Technology Laboratory Music Department National University of Ireland, Maynooth ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Csound-devel mailing list Csound-devel@lists.sourceforge.net