207426 2020-02-07 22:37:14 -0800 [WTF] Use SwissTable algorithm for larger HashTable 2020-04-13 20:20:16 -0700 1 1 1 Unclassified WebKit Web Template Framework WebKit Nightly Build Unspecified Unspecified NEW InRadar P2 Normal --- 1 ysuzuki ysuzuki benjamin cdumez cmarcelo darin dbates ews-watchlist ggaren keith_miller webkit-bug-importer oldest_to_newest 1616543 0 ysuzuki 2020-02-07 22:37:14 -0800 And let's use 75% load-factor even in larger table. 1616657 1 390197 ysuzuki 2020-02-08 22:26:24 -0800 Created attachment 390197 Patch 1616658 2 390198 ysuzuki 2020-02-08 22:40:25 -0800 Created attachment 390198 Patch 1616659 3 390199 ysuzuki 2020-02-08 23:04:31 -0800 Created attachment 390199 Patch 1616661 4 390200 ysuzuki 2020-02-09 01:26:45 -0800 Created attachment 390200 Patch 1616707 5 390214 ysuzuki 2020-02-09 15:04:33 -0800 Created attachment 390214 Patch 1616730 6 390220 ysuzuki 2020-02-09 17:47:28 -0800 Created attachment 390220 Patch 1616743 7 390222 ysuzuki 2020-02-09 19:19:31 -0800 Created attachment 390222 Patch 1616744 8 390223 ysuzuki 2020-02-09 19:23:25 -0800 Created attachment 390223 Patch 1616777 9 390233 ysuzuki 2020-02-09 22:11:27 -0800 Created attachment 390233 Patch 1617276 10 390339 ysuzuki 2020-02-10 19:54:39 -0800 Created attachment 390339 Patch 1617287 11 ysuzuki 2020-02-10 21:57:16 -0800 Some of membuster process's HashTable dump by using MALLOC_BREAKDOWN. This is interesting. Zone HashTable_0x110574000: 3867 nodes (2306608 bytes) COUNT BYTES AVG CLASS_NAME TYPE BINARY ===== ===== === ========== ==== ====== 1 16 16.0 non-object 720 57600 80.0 non-object 1739 250416 144.0 non-object 714 148512 208.0 non-object 276 75072 272.0 non-object 4 1344 336.0 non-object 61 24400 400.0 non-object 133 70224 528.0 non-object 1 592 592.0 non-object 11 7216 656.0 non-object 1 720 720.0 non-object 22 17248 784.0 non-object 66 101376 1536.0 non-object 8 16384 2048.0 non-object 28 71680 2560.0 non-object 3 9216 3072.0 non-object 31 142848 4608.0 non-object 1 5120 5120.0 non-object 3 16896 5632.0 non-object 6 39936 6656.0 non-object 1 7680 7680.0 non-object 1 8192 8192.0 non-object 8 69632 8704.0 non-object 5 53760 10752.0 non-object 4 51200 12800.0 non-object 1 14848 14848.0 non-object 4 67584 16896.0 non-object 2 41984 20992.0 non-object 2 50176 25088.0 non-object 7 458752 65536.0 non-object 2 196608 98304.0 non-object 1 229376 229376.0 non-object While # of HashTable has skew (144.0 is the most), accumulated memory of long-tail has fair-amount of memory. For example, total memory of 144.0 is smaller than 65536.0 sized table. We should optimize large-sized table too. 1617650 12 390429 ysuzuki 2020-02-11 14:44:07 -0800 Created attachment 390429 Patch 1617812 13 390478 ysuzuki 2020-02-11 18:56:54 -0800 Created attachment 390478 Patch 1618725 14 ysuzuki 2020-02-13 15:00:37 -0800 Test failure comes from the fact that this test is relying on hashtable. In some place, we put properties of JSGlobalObject into hashtable, iterating, and picking the first one to dump. Previously, it was, "undefined": undefined But now, it is, "NaN": NaN that's why we are seeing the failure. 1618888 15 390734 ysuzuki 2020-02-14 00:13:11 -0800 Created attachment 390734 Patch 1618901 16 webkit-bug-importer 2020-02-14 00:55:54 -0800 <rdar://problem/59453007> 1620251 17 390734 keith_miller 2020-02-18 11:39:33 -0800 Comment on attachment 390734 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=390734&action=review r=me if you fix the style errors and rename h1/h2. Can you make sure we have tests for SwissHashing in testWTF? > Source/WTF/ChangeLog:13 > + to select Group we will search. The key is that we maintains Control bytes as a side data, Nit: maintains => maintain and "a side data" => "side data" > Source/WTF/ChangeLog:16 > + For each bucket, we store either of (1) 7 bit hash code, (2) empty marker, or (3) deleted marker. Nit: either => one > Source/WTF/ChangeLog:18 > + operation to match 16 bucket hash codes in parallel, to filter out search candidate buckets in Nit: operation => operations. no comma after parallel. > Source/WTF/ChangeLog:19 > + one Group. And we can see last empty bucket if any bucket of Group is empty. So, almost all cases, Nit: "So, almost" => "So, in almost" > Source/WTF/wtf/HashTable.h:622 > + ALWAYS_INLINE unsigned h1(unsigned hash) h1 doesn't really convey the meaning of what we are computing here. Can we call this groupHash? > Source/WTF/wtf/HashTable.h:628 > + inline Control h2(unsigned hash) h2 doesn't really convey the meaning of what we are computing here. Can we call this controlHash? > Source/WTF/wtf/HashTable.h:1033 > + inline auto HashTable<Key, Value, Extractor, HashFunctions, Traits, KeyTraits>::lookupForWriting(const T& key, unsigned h) -> LookupType Can we change h to hash? It's poor style in the old code and now that it's a parameter is even worse... 1620520 18 390734 ggaren 2020-02-18 20:58:29 -0800 Comment on attachment 390734 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=390734&action=review > Source/WTF/ChangeLog:29 > + While JetStream2 is neutral, we get sub-1% improvement in Membuster. How big was the improvement in Membuster? 1621028 19 390734 ysuzuki 2020-02-19 19:22:14 -0800 Comment on attachment 390734 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=390734&action=review >> Source/WTF/ChangeLog:29 >> + While JetStream2 is neutral, we get sub-1% improvement in Membuster. > > How big was the improvement in Membuster? In my local testing, it is ~1%. We already got large improvement when increasing the load-factor from 50% to 75% for small HashMap. This patch allows this load-factor for larger tables. But maybe, I first need to check the result of https://bugs.webkit.org/show_bug.cgi?id=207827 and https://trac.webkit.org/changeset/257025/webkit 1641231 20 darin 2020-04-13 20:20:16 -0700 Looks OK to me. The key is really the performance testing and making sure we also do enough correctness testing. Like maybe testing with CHECK_HASHTABLE_CONSISTENCY set to 1? 390197 2020-02-08 22:26:24 -0800 2020-02-08 22:40:24 -0800 Patch bug-207426-20200208222623.patch text/plain 32865 ysuzuki U3VidmVyc2lvbiBSZXZpc2lvbjogMjU2MDk0CmRpZmYgLS1naXQgYS9Tb3VyY2UvV1RGL0NoYW5n ZUxvZyBiL1NvdXJjZS9XVEYvQ2hhbmdlTG9nCmluZGV4IGJlMDg4ZTQwY2QyZTYyNzU5MTU5MTNk ZWU3M2VlY2U4ZmE1NDZkYTYuLjczNGNlMjMyZThjY2NlMWRiMzc4NzM1MmMwZTRiNDA2YjUwOGI5 YmEgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XVEYvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9XVEYvQ2hh bmdlTG9nCkBAIC0xLDMgKzEsNDcgQEAKKzIwMjAtMDItMDggIFl1c3VrZSBTdXp1a2kgIDx5c3V6 dWtpQGFwcGxlLmNvbT4KKworICAgICAgICBbV1RGXSBVc2UgU3dpc3NUYWJsZSBhbGdvcml0aG0g Zm9yIGxhcmdlciBIYXNoVGFibGUKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hv d19idWcuY2dpP2lkPTIwNzQyNgorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEp LgorCisgICAgICAgICogd3RmL0hhc2hUYWJsZS5oOgorICAgICAgICAoV1RGOjpIYXNoVGFibGVD YXBhY2l0eUZvclNpemU6OnNob3VsZEV4cGFuZCk6CisgICAgICAgIChXVEY6Okhhc2hUYWJsZTo6 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