Benchmarking an Abstraction Cache for Pd
========================================
I implemented a rudimentary abstraction caching mechanism for Miller
Puckette's pd-0.41-4, which stores the parsed text ("binbuf") associated
with the class name instead of looking for files to load every time it
is instantiated.
Benchmark Mechanism
-------------------
Run 4 times, discarding first report:
$ time pd -open layer_2.pd -send "; pd quit" &>/dev/null
layer_2.pd contains 99 layer_1.pd contains 99 layer_0.pd,
total 9901 = 9801 layer 0 + 99 layer 1 + 1 layer 0
Results: Without Cache
----------------------
real 0m0.524s
user 0m0.260s
sys 0m0.256s
real 0m0.530s
user 0m0.224s
sys 0m0.276s
real 0m0.527s
user 0m0.224s
sys 0m0.296s
Results: With Cache
-------------------
real 0m0.082s
user 0m0.068s
sys 0m0.004s
real 0m0.148s
user 0m0.120s
sys 0m0.008s
real 0m0.085s
user 0m0.052s
sys 0m0.012s
Conclusion
----------
Abstraction cache gives a speed boost of more than 500% when loading
patches containing a large number of abstractions.
Further Work
------------
The main drawback (and the easiest issue to resolve) of the current
implementation is that once an abstraction is in the cache, it stays
there forever, no matter if the file is modified within or without Pd.
This could be fixed by flushing the cache immediately after the patch
is loaded (perhaps using Pd's scheduler).
Another drawback are that abstractions in different directories with
the same file name can clobber each other - the first one loaded is the
"one true abstraction" with that name, resolving this issue will be more
difficult.
--- pd-0.41-4.orig/src/m_class.c 2008-03-15 00:03:00.000000000 +0000
+++ pd-0.41-4/src/m_class.c 2008-10-01 11:15:12.000000000 +0100
@@ -514,14 +514,73 @@
t_symbol* pathsearch(t_symbol *s,char* ext);
int pd_setloadingabstraction(t_symbol *sym);
+
+/* abstraction cache */
+struct _abscache
+{
+ struct _abscache *next;
+ t_symbol *name;
+ t_symbol *file;
+ t_symbol *dir;
+ t_binbuf *binbuf;
+};
+typedef struct _abscache t_abscache;
+
+t_abscache *abscache_list;
+
+t_abscache *abscache_find(t_symbol *s)
+{
+ t_abscache *a = abscache_list;
+ while (a)
+ {
+ if (a->name == s) return a;
+ a = a->next;
+ }
+ return 0;
+}
+
+void abscache_add(t_symbol *name, t_symbol *file, t_symbol *dir, t_binbuf *binbuf)
+{
+ t_abscache *a = getbytes(sizeof(t_abscache));
+ a->next = abscache_list;
+ a->name = name;
+ a->file = file;
+ a->dir = dir;
+ a->binbuf = binbuf;
+ abscache_list = a;
+}
+
/* this routine is called when a new "object" is requested whose class Pd
doesn't know. Pd tries to load it as an extern, then as an abstraction. */
void new_anything(void *dummy, t_symbol *s, int argc, t_atom *argv)
{
+ t_abscache *abscache;
t_pd *current;
int fd;
char dirbuf[MAXPDSTRING], *nameptr;
if (tryingalready) return;
+ if ((abscache = abscache_find(s))) {
+ if (sys_verbose)
+ {
+ post("tried cache for %s and succeeded!", s->s_name);
+ }
+ newest = 0;
+ class_loadsym = 0;
+ current = s__X.s_thing;
+ if (!pd_setloadingabstraction(s))
+ {
+ int dspstate = canvas_suspend_dsp();
+ canvas_setargs(argc, argv);
+ glob_setfilename(0, abscache->name, abscache->dir);
+ binbuf_eval(abscache->binbuf, 0, 0, 0);
+ glob_setfilename(0, &s_, &s_);
+ if (s__X.s_thing != current)
+ canvas_popabstraction((t_canvas *)(s__X.s_thing));
+ canvas_setargs(0, 0);
+ canvas_resume_dsp(dspstate);
+ }
+ else error("%s: can't load cached abstraction within itself\n", s->s_name);
+ } else {
newest = 0;
class_loadsym = s;
if (sys_load_lib(canvas_getcurrent(), s->s_name))
@@ -542,7 +601,25 @@
if (!pd_setloadingabstraction(s))
{
canvas_setargs(argc, argv);
- binbuf_evalfile(gensym(nameptr), gensym(dirbuf));
+ {
+ t_symbol *name = gensym(nameptr);
+ t_symbol *dir = gensym(dirbuf);
+ t_binbuf *b = binbuf_new();
+ int dspstate = canvas_suspend_dsp();
+ glob_setfilename(0, name, dir);
+ if (binbuf_read(b, name->s_name, dir->s_name, 0))
+ {
+ perror(name->s_name);
+ }
+ else
+ {
+
+ binbuf_eval(b, 0, 0, 0);
+ }
+ glob_setfilename(0, &s_, &s_);
+ abscache_add(s, name, dir, b);
+ canvas_resume_dsp(dspstate);
+ }
if (s__X.s_thing != current)
canvas_popabstraction((t_canvas *)(s__X.s_thing));
canvas_setargs(0, 0);
@@ -551,6 +628,7 @@
}
else newest = 0;
}
+}
t_symbol s_pointer = {"pointer", 0, 0};
t_symbol s_float = {"float", 0, 0};
#N canvas 0 0 450 300 10;
#X obj 28 24 inlet;
#X obj 33 262 outlet;
#N canvas 0 0 450 300 10;
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#X obj 8 49 layer_0;
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#X obj 8 89 layer_0;
#X obj 8 109 layer_0;
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#X obj 8 149 layer_0;
#X obj 8 169 layer_0;
#X obj 8 189 layer_0;
#X obj 8 209 layer_0;
#X obj 8 230 layer_0;
#X obj 8 250 layer_0;
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#X obj 68 89 layer_0;
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#X obj 68 129 layer_0;
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#X obj 68 230 layer_0;
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#X obj 128 89 layer_0;
#X obj 128 109 layer_0;
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#X obj 128 169 layer_0;
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#X obj 248 109 layer_0;
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#X obj 248 149 layer_0;
#X obj 248 169 layer_0;
#X obj 248 189 layer_0;
#X obj 248 209 layer_0;
#X obj 248 230 layer_0;
#X obj 248 250 layer_0;
#X obj 248 270 layer_0;
#X obj 308 9 layer_0;
#X obj 308 29 layer_0;
#X obj 308 49 layer_0;
#X obj 308 69 layer_0;
#X obj 308 89 layer_0;
#X obj 308 109 layer_0;
#X obj 308 129 layer_0;
#X obj 308 149 layer_0;
#X obj 308 169 layer_0;
#X obj 308 189 layer_0;
#X obj 308 209 layer_0;
#X obj 308 230 layer_0;
#X obj 308 250 layer_0;
#X obj 308 270 layer_0;
#X obj 368 9 layer_0;
#X obj 368 29 layer_0;
#X obj 368 49 layer_0;
#X obj 368 69 layer_0;
#X obj 368 89 layer_0;
#X obj 368 109 layer_0;
#X obj 368 129 layer_0;
#X obj 368 149 layer_0;
#X obj 368 169 layer_0;
#X obj 368 189 layer_0;
#X obj 368 209 layer_0;
#X obj 368 230 layer_0;
#X obj 368 250 layer_0;
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#N canvas 0 0 450 300 10;
#X obj 8 9 layer_1;
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#X obj 8 49 layer_1;
#X obj 8 69 layer_1;
#X obj 8 89 layer_1;
#X obj 8 109 layer_1;
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#X obj 8 169 layer_1;
#X obj 8 189 layer_1;
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#X obj 8 230 layer_1;
#X obj 8 250 layer_1;
#X obj 8 270 layer_1;
#X obj 68 9 layer_1;
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#X obj 68 149 layer_1;
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#X obj 68 189 layer_1;
#X obj 68 209 layer_1;
#X obj 68 230 layer_1;
#X obj 68 250 layer_1;
#X obj 68 270 layer_1;
#X obj 128 9 layer_1;
#X obj 128 29 layer_1;
#X obj 128 49 layer_1;
#X obj 128 69 layer_1;
#X obj 128 89 layer_1;
#X obj 128 109 layer_1;
#X obj 128 129 layer_1;
#X obj 128 149 layer_1;
#X obj 128 169 layer_1;
#X obj 128 189 layer_1;
#X obj 128 209 layer_1;
#X obj 128 230 layer_1;
#X obj 128 250 layer_1;
#X obj 128 270 layer_1;
#X obj 188 9 layer_1;
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#X obj 188 69 layer_1;
#X obj 188 89 layer_1;
#X obj 188 109 layer_1;
#X obj 188 129 layer_1;
#X obj 188 149 layer_1;
#X obj 188 169 layer_1;
#X obj 188 189 layer_1;
#X obj 188 209 layer_1;
#X obj 188 230 layer_1;
#X obj 188 250 layer_1;
#X obj 188 270 layer_1;
#X obj 248 9 layer_1;
#X obj 248 29 layer_1;
#X obj 248 49 layer_1;
#X obj 248 69 layer_1;
#X obj 248 89 layer_1;
#X obj 248 109 layer_1;
#X obj 248 129 layer_1;
#X obj 248 149 layer_1;
#X obj 248 169 layer_1;
#X obj 248 189 layer_1;
#X obj 248 209 layer_1;
#X obj 248 230 layer_1;
#X obj 248 250 layer_1;
#X obj 248 270 layer_1;
#X obj 308 9 layer_1;
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#X obj 308 89 layer_1;
#X obj 308 109 layer_1;
#X obj 308 129 layer_1;
#X obj 308 149 layer_1;
#X obj 308 169 layer_1;
#X obj 308 189 layer_1;
#X obj 308 209 layer_1;
#X obj 308 230 layer_1;
#X obj 308 250 layer_1;
#X obj 308 270 layer_1;
#X obj 368 9 layer_1;
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