*FINALLY!*
Okay, so when setting, config.assets.compress = true, this uses a
JavaScript (V8) runtime, right?
Somewhere in the compressor, your whole Rails app is being loaded
(multiple times!). In my case, this include features/**/*.rb
These Ruby files have some references to the constant Capybara. Because
I don't have the Capybara gem available on my server (it's in the 'test'
group in Gemfile), Rails will be doing its magic constant missing
trickery, which is crazy expensive.
This brought the total time to run the 'rake assets:precompile' task to
20 minutes! I could reproduce it locally by removing the Capybara gem
from my Gemfile.
I really hope Google will index this well, and nobody has to spend
another full day tracing this bug.
Now let's fix this!
By the way, here is some output from the process sampler:
1 rb_gc_mark (in ruby) + 55 [0x100039d47]
1457 Thread_33491: SamplerThread
1457 thread_start (in libsystem_c.dylib) + 13 [0x7fff8bdf8b75]
1457 _pthread_start (in libsystem_c.dylib) + 335
[0x7fff8bdf58bf]
1457 _ZN2v88internalL11ThreadEntryEPv (in v8.bundle) + 85
[0x102dd4d75]
1457 v8::internal::SamplerThread::Run() (in v8.bundle) + 55
[0x102dd55c7]
1457
v8::internal::RuntimeProfilerRateLimiter::SuspendIfNecessary() (in
v8.bundle) + 120 [0x102dedbc8]
1457 semaphore_wait_trap (in libsystem_kernel.dylib) +
10 [0x7fff8d2f96b6]
Total number in stack (recursive counted multiple, when >=5):
27300 rb_gc_mark (in ruby) + 190 [0x100039dce]
12110 st_foreach (in ruby) + 98 [0x1000878a2]
11346 mark_entry (in ruby) + 12 [0x100039eec]
5576 gc_mark_children (in ruby) + 124 [0x10003959c]
5312 gc_mark_children (in ruby) + 1778 [0x100039c12]
5181 gc_mark_children (in ruby) + 1524 [0x100039b14]
4558 gc_mark_children (in ruby) + 1769 [0x100039c09]
4017 rb_call (in ruby) + 188 [0x1000237ac]
3100 rb_call0 (in ruby) + 3267 [0x1000233c3]
2648 eval_call (in ruby) + 347 [0x10002d95b]
2186 gc_mark_children (in ruby) + 1386 [0x100039a8a]
1461 rb_eval (in ruby) + 525 [0x10001e95d]
1257 rb_yield_0 (in ruby) + 1135 [0x10002174f]
1014 eval_iter (in ruby) + 1029 [0x10002e1c5]
1010 eval_fcall (in ruby) + 330 [0x10002d69a]
926 rb_call0 (in ruby) + 3436 [0x10002346c]
775 gc_mark_children (in ruby) + 1796 [0x100039c24]
748 mark_keyvalue (in ruby) + 25 [0x100039ec9]
496 blk_mark (in ruby) + 50 [0x100017622]
495 gc_mark_children (in ruby) + 1993 [0x100039ce9]
480 rb_ary_each (in ruby) + 46 [0x1000015ce]
430 rb_eval (in ruby) + 1464 [0x10001ed08]
381 gc_mark_children (in ruby) + 1539 [0x100039b23]
357 blk_mark (in ruby) + 76 [0x10001763c]
357 rb_eval (in ruby) + 3331 [0x10001f453]
335 gc_mark_children (in ruby) + 0 [0x100039520]
294 rb_gc_mark (in ruby) + 0 [0x100039d10]
293 eval_call (in ruby) + 461 [0x10002d9cd]
274 eval_rescue (in ruby) + 311 [0x100024b87]
273 rb_eval (in ruby) + 853 [0x10001eaa5]
272 proc_invoke (in ruby) + 1181 [0x1000224fd]
270 gc_mark_children (in ruby) + 1515 [0x100039b0b]
264 block_pass (in ruby) + 868 [0x100029494]
254 eval_call (in ruby) + 114 [0x10002d872]
253 blk_mark (in ruby) + 97 [0x100017651]
174 eval_while (in ruby) + 268 [0x1000207fc]
174 garbage_collect (in ruby) + 79 [0x10003b00f]
174 garbage_collect_0 (in ruby) + 200 [0x10003a138]
174 rb_str_resize (in ruby) + 94 [0x10008e00e]
174 ruby_xrealloc (in ruby) + 215 [0x10003b9c7]
174 strio_extend (in stringio.bundle) + 60 [0x1001f190c]
stringio.c:757
174 strio_putc (in stringio.bundle) + 184 [0x1001f2cb8]
stringio.c:1135
166 rb_eval (in ruby) + 1901 [0x10001eebd]
165 eval_slit (in ruby) + 81 [0x100024cb1]
165 rb_eval (in ruby) + 1987 [0x10001ef13]
143 rb_eval (in ruby) + 3144 [0x10001f398]
141 rb_eval (in ruby) + 2205 [0x10001efed]
133 st_foreach (in ruby) + 0 [0x100087840]
132 rb_eval (in ruby) + 3073 [0x10001f351]
117 eval_attrasgn (in ruby) + 397 [0x10002dc4d]
99 eval_ensure (in ruby) + 231 [0x1000204a7]
53 gc_mark_children (in ruby) + 642 [0x1000397a2]
49 rb_mark_generic_ivar (in ruby) + 57 [0x100099639]
37 rb_fast_mark_table_contains (in ruby) + 0
[0x100036eb0]
31 mark_keyvalue (in ruby) + 17 [0x100039ec1]
28 gc_mark_children (in ruby) + 331 [0x10003966b]
27 gc_mark_children (in ruby) + 1556 [0x100039b34]
24 rb_gc_mark (in ruby) + 105 [0x100039d79]
23 mark_source_filename (in ruby) + 0 [0x100037000]
22 rb_fast_mark_table_add (in ruby) + 0 [0x100036e90]
14 blk_mark (in ruby) + 41 [0x100017619]
13 gc_mark_children (in ruby) + 1473 [0x100039ae1]
12 gc_mark_children (in ruby) + 1486 [0x100039aee]
11 rb_fast_mark_table_add_filename (in ruby) + 0
[0x100036ef0]
10 blk_mark (in ruby) + 121 [0x100017669]
10 rb_gc_mark (in ruby) + 118 [0x100039d86]
8 rb_load (in ruby) + 1476 [0x100030184]
7 mark_entry (in ruby) + 0 [0x100039ee0]
7 rb_f_load (in ruby) + 53 [0x1000307f5]
5 blk_mark (in ruby) + 0 [0x1000175f0]
5 gc_mark_children (in ruby) + 463 [0x1000396ef]
Sort by top of stack, same collapsed (when >= 5):
semaphore_wait_trap (in libsystem_kernel.dylib) 1457
gc_mark_children (in ruby) 399
rb_gc_mark (in ruby) 386
rb_fast_mark_table_heap_contains (in ruby) 224
st_foreach (in ruby) 222
garbage_collect_0 (in ruby) 78
rb_fast_mark_table_contains (in ruby) 37
mark_source_filename (in ruby) 24
rb_fast_mark_table_add (in ruby) 22
rb_fast_mark_table_heap_remove (in ruby) 16
rb_fast_mark_table_add_filename (in ruby) 11
mark_entry (in ruby) 7
blk_mark (in ruby) 5
rb_fast_mark_table_contains_filename (in ruby) 5
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