99634 2012-10-17 13:52:57 -0700 [v8] IntegerCache should be removed in favor of a faster v8 API 2012-10-22 15:42:03 -0700 1 1 1 Unclassified WebKit New Bugs 528+ (Nightly build) Unspecified Unspecified RESOLVED INVALID P2 Normal --- 1 eric abarth abarth dcarney haraken oldest_to_newest 744577 0 eric 2012-10-17 13:52:57 -0700 [v8] IntegerCache is redundant with V8's SMI support and should be removed It looks like we'd just need to create a version of Integer::New() which is inlined, and can take an Isolate pointer. Then we would have exactly the same branch cost as our current IntegerCache implementation, without the extra code. :) We'd also then be faster on all integers up to the SMI limit, instead of const int numberOfCachedSmallIntegers = 64; 744578 1 abarth 2012-10-17 13:53:51 -0700 We need to add a new V8 API for creating integers quickly. 744590 2 abarth 2012-10-17 14:01:36 -0700 The problem is more that v8::Integer::New needs to grab the isolate out of thread-local storage. In any case, we should fix this by improving the V8 API. 744625 3 abarth 2012-10-17 14:36:29 -0700 V8 change is in <https://codereview.chromium.org/11212004/>. I haven't benchmarked the new API to know whether it is fast enough for our purposes. @haraken, would you be willing to run the same benchmark you ran when you introduced the IntegerCache? 744815 4 haraken 2012-10-17 17:07:10 -0700 (In reply to comment #2) > The problem is more that v8::Integer::New needs to grab the isolate out of thread-local storage. In any case, we should fix this by improving the V8 When I was investigating the performance, another problem was the overhead to create a local handle for a cached persistent handle of SMIs. Given that V8 APIs needs to be general, V8 APIs cannot avoid creating local handles every time. On the other hand, by caching the persistent handles in the V8 binding side, we can avoid creating local handles and just return the cached persistent handles (because V8 binding knows the lifetime of Workers and their persistent handles). (In reply to comment #3) > V8 change is in <https://codereview.chromium.org/11212004/>. I haven't benchmarked the new API to know whether it is fast enough for our purposes. > > @haraken, would you be willing to run the same benchmark you ran when you introduced the IntegerCache? The benchmark is Bindings/scroll-top.html 744853 5 abarth 2012-10-17 17:44:32 -0700 > The benchmark is Bindings/scroll-top.html Thanks. I'll try that now. 744870 6 169316 abarth 2012-10-17 17:56:27 -0700 Created attachment 169316 Patch for benchmarking 744871 7 169317 abarth 2012-10-17 17:57:42 -0700 Created attachment 169317 PerformanceTest results (first three are with patch; last three are without patch) Looks like about a 5% slow down on this benchmark. It's a bit hard to tell because this machine is noisy for benchmarks. I might try benchmarking it again on a more stable machine. 744876 8 abarth 2012-10-17 18:01:55 -0700 For fun, I ran the benchmark with the old v8::Integer::New API, and the new API is definitely faster, just not as fast as having the integer cache. 744879 9 haraken 2012-10-17 18:03:58 -0700 (In reply to comment #8) > For fun, I ran the benchmark with the old v8::Integer::New API, and the new API is definitely faster, just not as fast as having the integer cache. I would guess that the new API is still consuming time on creating a local handle by Utils::IntegerToLocal(result), which is not needed in the IntegerCache. 744880 10 abarth 2012-10-17 18:07:16 -0700 > I would guess that the new API is still consuming time on creating a local handle by Utils::IntegerToLocal(result), which is not needed in the IntegerCache. What takes the time here? #define MAKE_TO_LOCAL(Name, From, To) \ Local<v8::To> Utils::Name(v8::internal::Handle<v8::internal::From> obj) { \ ASSERT(obj.is_null() || !obj->IsTheHole()); \ return Local<To>(reinterpret_cast<To*>(obj.location())); \ } I don't see a call to Local::New there. 744884 11 haraken 2012-10-17 18:16:07 -0700 (In reply to comment #10) > What takes the time here? > > #define MAKE_TO_LOCAL(Name, From, To) \ > Local<v8::To> Utils::Name(v8::internal::Handle<v8::internal::From> obj) { \ > ASSERT(obj.is_null() || !obj->IsTheHole()); \ > return Local<To>(reinterpret_cast<To*>(obj.location())); \ > } > > I don't see a call to Local::New there. hmm, that's true... 744890 12 abarth 2012-10-17 18:29:19 -0700 I think I just need to benchmark this stuff on a more performance-stable machine. 745738 13 abarth 2012-10-18 16:47:23 -0700 I benchmarked this on a more performance-stable machine, and the faster API isn't fast enough. 747984 14 abarth 2012-10-22 15:42:03 -0700 Bug 100016 is a follow up to this bug. 169316 2012-10-17 17:56:27 -0700 2012-10-17 17:56:27 -0700 Patch for benchmarking bug-99634-20121017175514.patch text/plain 1066 abarth U3VidmVyc2lvbiBSZXZpc2lvbjogMTMxNjc5CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9i aW5kaW5ncy92OC9WOEJpbmRpbmcuaCBiL1NvdXJjZS9XZWJDb3JlL2JpbmRpbmdzL3Y4L1Y4Qmlu ZGluZy5oCmluZGV4IGE0MGU3NWFhZWYzMzc1M2QzNDg3ZDM1NDZkM2M1MGU1ZGQ3MDRlODQuLmU2 ODUyMzIxYTA3NTUwYjg3Mjk0YmUwNGY0Njg3NTIxOTE1OWRkM2UgMTAwNjQ0Ci0tLSBhL1NvdXJj ZS9XZWJDb3JlL2JpbmRpbmdzL3Y4L1Y4QmluZGluZy5oCisrKyBiL1NvdXJjZS9XZWJDb3JlL2Jp bmRpbmdzL3Y4L1Y4QmluZGluZy5oCkBAIC0xMDksMTQgKzEwOSwxMiBAQCBuYW1lc3BhY2UgV2Vi Q29yZSB7CiAKICAgICBpbmxpbmUgdjg6OkhhbmRsZTx2ODo6SW50ZWdlcj4gdjhJbnRlZ2VyKGlu dCB2YWx1ZSwgdjg6Oklzb2xhdGUqIGlzb2xhdGUgPSAwKQogICAgIHsKLSAgICAgICAgVjhQZXJJ c29sYXRlRGF0YSogZGF0YSA9IFY4UGVySXNvbGF0ZURhdGE6OmN1cnJlbnQoaXNvbGF0ZSk7Ci0g ICAgICAgIHJldHVybiBkYXRhLT5pbnRlZ2VyQ2FjaGUoKS0+djhJbnRlZ2VyKHZhbHVlKTsKKyAg 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