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authornormal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2014-05-10 23:48:51 (GMT)
committernormal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2014-05-10 23:48:51 (GMT)
commitf11db2a605d99ef6a0943eba34db355188f8efcb (patch)
tree277ff70e7cc260d26f3028d89f25d5b4603675b4 /benchmark
parent3771a370ad64aae87f751751e80d52d02a1735a9 (diff)
vm*: doubly-linked list from ccan to manage vm->living_threads
A doubly-linked list for tracking living threads guarantees constant-time insert/delete performance with no corner cases of a hash table. I chose this ccan implementation of doubly-linked lists over the BSD sys/queue.h implementation since: 1) insertion and removal are both branchless 2) locality is improved if a struct may be a member of multiple lists (0002 patch in Feature 9632 will introduce a secondary list for waiting FDs) This also increases cache locality during iteration: improving performance in a new IO#close benchmark with many sleeping threads while still scanning the same number of threads. vm_thread_close 1.762 * vm_core.h (rb_vm_t): list_head and counter for living_threads (rb_thread_t): vmlt_node for living_threads linkage (rb_vm_living_threads_init): new function wrapper (rb_vm_living_threads_insert): ditto (rb_vm_living_threads_remove): ditto * vm.c (rb_vm_living_threads_foreach): new function wrapper * thread.c (terminate_i, thread_start_func_2, thread_create_core, thread_fd_close_i, thread_fd_close): update to use new APIs * vm.c (vm_mark_each_thread_func, rb_vm_mark, ruby_vm_destruct, vm_memsize, vm_init2, Init_VM): ditto * vm_trace.c (clear_trace_func_i, rb_clear_trace_func): ditto * benchmark/bm_vm_thread_close.rb: added to show improvement * ccan/build_assert/build_assert.h: added as a dependency of list.h * ccan/check_type/check_type.h: ditto * ccan/container_of/container_of.h: ditto * ccan/licenses/BSD-MIT: ditto * ccan/licenses/CC0: ditto * ccan/str/str.h: ditto (stripped of unused macros) * ccan/list/list.h: ditto * add CCAN_LIST_INCLUDES [ruby-core:61871][Feature 9632 (part 1)] Apologies for the size of this commit, but I think a good doubly-linked list will be useful for future features, too. This may be used to add ordering to a container_of-based hash table to preserve compatibility if required (e.g. feature 9614). git-svn-id: svn+ssh:// b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'benchmark')
1 files changed, 6 insertions, 0 deletions
diff --git a/benchmark/bm_vm_thread_close.rb b/benchmark/bm_vm_thread_close.rb
new file mode 100644
index 0000000..3e9a265
--- /dev/null
+++ b/benchmark/bm_vm_thread_close.rb
@@ -0,0 +1,6 @@
+1000.times { { sleep } }
+i = 0
+while i<100_000 # benchmark loop 3
+ i += 1
+ IO.pipe.each(&:close)