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#! winxed
/*
Copyright (C) 2011, Parrot Foundation.
http://whiteknight.github.io/2011/05/10/timings_vtable_overrides.html
=head1 SYNOPSIS
./winxed -c --noan examples/benchmarks/dispatch.winxed
./parrot examples/benchmarks/dispatch.pir
=head1 DESCRIPTION
Method dispatch benchmark
Starting no dispatch (base line)
Total time: 0.189244s
Starting vtable calls
Total time: 0.257013s
Starting method calls
Total time: 4.172381s
Starting vtable_override calls
Total time: 8.376169s
with callgrind:
475,004,380 fill_params
412,681,236 Parrot_gc_fixed_allocator_allocate
338,013,596 gc_gms_allocate_pmc_header
314,497,452 gc_gms_mark_and_sweep
275,002,531 runops_fast_core
260,081,808 Parrot_pmc_new
In addition to the PCC and GC costs of the dispatch mechanisms, vtable
overrides must recurse and create a new runloop. (ext_call)
callgrind_annotate --inclusive=yes:
10,907,096,693 Parrot_ext_call'2
8,405,564,370 Parrot_pcc_invoke_from_sig_object'2
7,149,991,128 0x0000000000001180 [ld-2.18.so]
7,145,266,550 0x00000000004020aa [parrot]
7,145,263,511 libc-start.c:(below main) [libc-2.18.so]
7,145,263,303 main [parrot]
7,140,721,402 Parrot_api_run_bytecode
=cut
*/
class MyTestClass {
function get_integer[vtable]() { return 1; }
function get_int() { return 1; }
}
function main[main]() {
var total_runs = 1000000; // one million times
var obj = new MyTestClass;
var myint = new 'Integer';
count_time("no dispatch (base line)", function() {
int count = total_runs;
int result = 0;
for (int i = 0; i < count; i++)
result = result + 1;
});
count_time("vtable calls", function() {
int count = total_runs;
myint = 1;
int result = 0;
for (int i = 0; i < count; i++)
result = result + myint;
});
count_time("method calls", function() {
int count = total_runs;
int result = 0;
for (int i = 0; i < count; i++)
result = result + obj.get_int();
});
count_time("vtable_override calls", function() {
int count = total_runs;
int result = 0;
for (int i = 0; i < count; i++)
result = result + obj;
});
}
function count_time(string description, var code)
{
say(sprintf("Starting %s", [description]));
float starttime = floattime();
code();
float endtime = floattime();
say(sprintf("Total time: %fs\n", [endtime - starttime]));
}
# Local Variables:
# mode: winxed
# fill-column: 78
# End:
# vim: expandtab shiftwidth=4 ft=winxed:
|
