Misc #15806
openExplicitly initialise encodings on init to remove branches on encoding lookup
Description
References Github PR https://github.com/ruby/ruby/pull/2128
I noticed that the encoding table is loaded on startup of even just miniruby
(minimal viable interpreter use case) through this backtrace during ruby setup:
/home/lourens/src/ruby/ruby/miniruby(rb_enc_init+0x12) [0x56197b0c0c72] encoding.c:587
/home/lourens/src/ruby/ruby/miniruby(rb_usascii_encoding+0x1a) [0x56197b0c948a] encoding.c:1357
/home/lourens/src/ruby/ruby/miniruby(Init_sym+0x7a) [0x56197b24810a] symbol.c:42
/home/lourens/src/ruby/ruby/miniruby(rb_call_inits+0x1d) [0x56197b11afed] inits.c:25
/home/lourens/src/ruby/ruby/miniruby(ruby_setup+0xf6) [0x56197b0ec9d6] eval.c:74
/home/lourens/src/ruby/ruby/miniruby(ruby_init+0x9) [0x56197b0eca39] eval.c:91
/home/lourens/src/ruby/ruby/miniruby(main+0x5a) [0x56197b051a2a] ./main.c:41
Therefore I think it makes sense to instead initialize encodings explicitly just prior to symbol init, which is the first entry point into the interpreter loading that currently triggers rb_enc_init
and remove the initialization check branches from the various lookup methods.
Some of the branches collapsed, cachegrind
output, columns are Ir Bc Bcm Bi Bim
with Ir
(instructions retired), Bc
(branches taken) and Bcm
(branches missed) relevant here as there are no indirect branches (function pointers etc.):
(hot function, many instructions retired and branches taken and missed)
. . . . . rb_encoding *
. . . . . rb_enc_from_index(int index)
835,669 0 0 0 0 {
13,133,536 6,337,652 50,267 0 0 if (!enc_table.list) {
3 0 0 0 0 rb_enc_init();
. . . . . }
23,499,349 8,006,202 293,161 0 0 if (index < 0 || enc_table.count <= (index &= ENC_INDEX_MASK)) {
. . . . . return 0;
. . . . . }
30,024,494 0 0 0 0 return enc_table.list[index].enc;
1,671,338 0 0 0 0 }
(cold function, representative of the utf8 variant more or less too)
. . . . . rb_encoding *
. . . . . rb_ascii8bit_encoding(void)
. . . . . {
27,702 9,235 955 0 0 if (!enc_table.list) {
. . . . . rb_enc_init();
. . . . . }
9,238 0 0 0 0 return enc_table.list[ENCINDEX_ASCII].enc;
9,232 0 0 0 0 }
I think lazy loading encodings and populating the table is fine, but initializing it can be done more explicitly in the boot process.
Updated by methodmissing (Lourens Naudé) over 5 years ago
- Status changed from Open to Closed
Applied in changeset git|6546aed4757be07f4932326e1eb41a5d69141acf.
Explicitly initialise encodings on init to remove branches on encoding lookup
[Misc #15806]
Updated by mame (Yusuke Endoh) about 5 years ago
- Status changed from Closed to Assigned
- Assignee set to nobu (Nobuyoshi Nakada)
usa said it might not work on windows when the install path includes non-ASCII characters. Please check it out, @nobu (Nobuyoshi Nakada) .