[CakeML-dev] Let's remove max_app
Scott Owens
S.A.Owens at kent.ac.uk
Tue Mar 7 22:17:18 UTC 2017
Which commit is the clos_lang test with?
Scott
> On 2017/03/07, at 22:15, Yong Kiam <tanyongkiam at gmail.com> wrote:
>
> Here're the numbers with max_app = 10 on both branches for btree and fib:
>
> --- master ---
>
> btree
> Compile to livesets
> runtime: 6m39s, gctime: 28.0s, systime: 2.7s.
> Axioms: 0, Defs: 0, Disk: 0, Orcl: 0, Prims: 709909286; Total: 709909286
>
> 607 oracles
>
> Repeat compilation with oracle
> runtime: 29m39s, gctime: 2m13s, systime: 10.5s.
> Axioms: 0, Defs: 0, Disk: 0, Orcl: 0, Prims: 3239510671; Total: 3239510671
>
> fib
> Compile to livesets
> runtime: 6m36s, gctime: 26.1s, systime: 2.7s.
> Axioms: 0, Defs: 0, Disk: 0, Orcl: 0, Prims: 704732789; Total: 704732789
>
> 597 oracles
>
> Repeat compilation with oracle
> runtime: 25m19s, gctime: 1m01s, systime: 5.5s.
> Axioms: 0, Defs: 0, Disk: 0, Orcl: 0, Prims: 2618410506; Total: 2618410506
>
> --- clos_stubs ---
>
> btree
> Compile to livesets
> runtime: 4m01s, gctime: 6.1s, systime: 0.55600s.
> Axioms: 0, Defs: 0, Disk: 0, Orcl: 0, Prims: 446369571; Total: 446369571
>
> 551 oracles
>
> Repeat compilation with oracle
> runtime: 19m24s, gctime: 1m52s, systime: 9.7s.
> Axioms: 0, Defs: 0, Disk: 0, Orcl: 0, Prims: 2070001412; Total: 2070001412
>
> fib
> Compile to livesets
> runtime: 3m58s, gctime: 6.3s, systime: 0.64800s.
> Axioms: 0, Defs: 0, Disk: 0, Orcl: 0, Prims: 441178076; Total: 441178076
>
> 541 oracles
>
> Repeat compilation with oracle
> runtime: 16m29s, gctime: 1m33s, systime: 7.8s.
> Axioms: 0, Defs: 0, Disk: 0, Orcl: 0, Prims: 1588238417; Total: 1588238417
>
>
> On Tue, Mar 7, 2017 at 11:31 AM, Yong Kiam <tanyongkiam at gmail.com> wrote:
> I'll try and leave two of the benchmarks with max_app set to 10 before I go to lectures (still rebuilding on master).
>
> On Tue, Mar 7, 2017 at 11:24 AM, Magnus Myreen <magnus.myreen at gmail.com> wrote:
> What are we measuring? I'm keen to know how high max_app can be. I suspect we need it to be 10 in order to avoid generating bad applications when compiling the compiler. -- Magnus
>
> On Tue, 7 Mar 2017 at 16:28, Scott Owens <S.A.Owens at kent.ac.uk> wrote:
> Hold off for now, I just thought of another easy improvement.
>
> Scott
>
> > On 2017/03/07, at 15:12, Yong Kiam <tanyongkiam at gmail.com> wrote:
> >
> > I can get you a before/after test on master and clos_stub on one of the benchmarks compiled in the logic.
> >
> > (will take awhile though)
> >
> > On Tue, Mar 7, 2017 at 10:04 AM, Scott Owens <S.A.Owens at kent.ac.uk> wrote:
> > I should clarify that this is on the clos_stub branch, which I haven’t merged back to master.
> >
> > Scott
> >
> > > On 2017/03/07, at 15:00, Scott Owens <S.A.Owens at kent.ac.uk> wrote:
> > >
> > > I’ve just finished the first improvement on reducing the number of stubs. I’d like to see where we are before trying to get further improvements. Can you re-try this, or even better, tell me what you were doing to get these numbers. Can we get anything meaningful without running the bootstrap (and the attendant 2 day wait)?
> > >
> > > Scott
> > >
> > >> On 2017/03/05, at 08:21, Magnus Myreen <magnus.myreen at gmail.com> wrote:
> > >>
> > >> Hi all,
> > >>
> > >> We should get rid of max_app. Reasons:
> > >>
> > >> 2. The current compilation strategy produces too much stub code in
> > >> clos_to_bvl. If we really must have max_app (I argue below that
> > >> we don't), then it should be something like 10 or 15. With the
> > >> current compilation strategy, the binary produced for max_app=9 is
> > >> 176 kb larger than the binary for max_app=3. I wanted to try
> > >> compiling with max_app=10, but that was taking more than 5
> > >> minutes. Compiling with max_app=3 takes 7 seconds for me. I
> > >> believe the slow down in compilation speed with differing max_app
> > >> values is caused by the rapid increase in code size (number of
> > >> stubs in clos_to_bvl) as max_app gets larger. My measurements
> > >> are below while compiling factorial (and the basis library):
> > >>
> > >> max_app=1: 10.810s (* very little room for opts in basis *)
> > >> max_app=2: 8.724s
> > >> max_app=3: 7.872s (* allows optimisations in basis code *)
> > >> max_app=4: 8.935s
> > >> max_app=5: 11.608s
> > >> max_app=6: 21.771s
> > >> max_app=7: 42.932s
> > >> max_app=8: 1m24.872s
> > >> max_app=9: 3m9.745s
> > >
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>
>
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