bmalloc: Added a fast XLarge allocator
Created attachment 272306 [details] Patch
~/OpenSource/PerformanceTests/MallocBench> cat results.txt ~/OpenSource/PerformanceTests/MallocBench> ./run-malloc-benchmarks Baseline:~/OpenSource/WebKitBuildBaseline/Release/ Patch:~/OpenSource/WebKitBuild/Release/ Baseline Patch Δ Execution Time: churn 85ms 82ms ^ 1.04x faster list_allocate 70ms 76ms ! 1.09x slower tree_allocate 82ms 86ms ! 1.05x slower tree_churn 85ms 88ms ! 1.04x slower fragment 97ms 77ms ^ 1.26x faster fragment_iterate 84ms 82ms ^ 1.02x faster medium 206ms 188ms ^ 1.1x faster big 160ms 146ms ^ 1.1x faster facebook 473ms 252ms ^ 1.88x faster reddit 120ms 122ms ! 1.02x slower flickr 128ms 127ms ^ 1.01x faster theverge 158ms 157ms ^ 1.01x faster nimlang 137ms 133ms ^ 1.03x faster message_one 218ms 223ms ! 1.02x slower message_many 120ms 119ms ^ 1.01x faster churn --parallel 39ms 39ms list_allocate --parallel 72ms 75ms ! 1.04x slower tree_allocate --parallel 85ms 90ms ! 1.06x slower tree_churn --parallel 87ms 85ms ^ 1.02x faster fragment --parallel 53ms 52ms ^ 1.02x faster fragment_iterate --parallel 34ms 32ms ^ 1.06x faster medium --parallel 200ms 182ms ^ 1.1x faster big --parallel 135ms 133ms ^ 1.02x faster <geometric mean> 107ms 102ms ^ 1.05x faster <arithmetic mean> 127ms 115ms ^ 1.11x faster <harmonic mean> 91ms 89ms ^ 1.02x faster Peak Memory: churn 788kB 804kB ! 1.02x bigger list_allocate 2,100kB 2,104kB ! 1.0x bigger tree_allocate 5,488kB 5,492kB ! 1.0x bigger tree_churn 4,800kB 4,800kB fragment 7,004kB 7,008kB ! 1.0x bigger fragment_iterate 25,568kB 25,596kB ! 1.0x bigger medium 1,068,412kB 1,068,420kB ! 1.0x bigger big 1,060,468kB 1,060,464kB ^ 1.0x smaller facebook 73,928kB 73,916kB ^ 1.0x smaller reddit 13,920kB 13,896kB ^ 1.0x smaller flickr 25,840kB 25,852kB ! 1.0x bigger theverge 27,012kB 26,960kB ^ 1.0x smaller nimlang 215,548kB 217,276kB ! 1.01x bigger message_one 4,704kB 5,304kB ! 1.13x bigger message_many 4,964kB 4,908kB ^ 1.01x smaller churn --parallel 956kB 968kB ! 1.01x bigger list_allocate --parallel 2,216kB 2,232kB ! 1.01x bigger tree_allocate --parallel 3,380kB 3,332kB ^ 1.01x smaller tree_churn --parallel 3,004kB 3,032kB ! 1.01x bigger fragment --parallel 7,144kB 7,156kB ! 1.0x bigger fragment_iterate --parallel 25,680kB 25,748kB ! 1.0x bigger medium --parallel 1,062,960kB 1,066,388kB ! 1.0x bigger big --parallel 1,055,320kB 1,058,988kB ! 1.0x bigger <geometric mean> 18,511kB 18,643kB ! 1.01x bigger <arithmetic mean> 204,400kB 204,811kB ! 1.0x bigger <harmonic mean> 4,418kB 4,472kB ! 1.01x bigger Memory at End: churn 380kB 392kB ! 1.03x bigger list_allocate 408kB 408kB tree_allocate 468kB 468kB tree_churn 456kB 452kB ^ 1.01x smaller fragment 468kB 460kB ^ 1.02x smaller fragment_iterate 644kB 640kB ^ 1.01x smaller medium 4,612kB 4,612kB big 4,616kB 4,596kB ^ 1.0x smaller facebook 3,336kB 3,288kB ^ 1.01x smaller reddit 2,296kB 2,272kB ^ 1.01x smaller flickr 3,276kB 3,252kB ^ 1.01x smaller theverge 3,320kB 3,268kB ^ 1.02x smaller nimlang 34,256kB 34,132kB ^ 1.0x smaller message_one 688kB 700kB ! 1.02x bigger message_many 1,108kB 1,180kB ! 1.06x bigger churn --parallel 548kB 552kB ! 1.01x bigger list_allocate --parallel 640kB 624kB ^ 1.03x smaller tree_allocate --parallel 724kB 704kB ^ 1.03x smaller tree_churn --parallel 1,168kB 1,180kB ! 1.01x bigger fragment --parallel 1,312kB 1,352kB ! 1.03x bigger fragment_iterate --parallel 848kB 852kB ! 1.0x bigger medium --parallel 4,720kB 4,740kB ! 1.0x bigger big --parallel 4,724kB 4,720kB ^ 1.0x smaller <geometric mean> 1,424kB 1,426kB ! 1.0x bigger <arithmetic mean> 3,262kB 3,254kB ^ 1.0x smaller <harmonic mean> 911kB 913kB ! 1.0x bigger ===== ~/OpenSource/PerformanceTests/MallocBench> ===== ~/OpenSource/PerformanceTests/MallocBench>
Attachment 272306 [details] did not pass style-queue: ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:26: Found header this file implements before WebCore config.h. Should be: config.h, primary header, blank line, and then alphabetically sorted. [build/include_order] [4] ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:108: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:109: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:117: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:131: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/bmalloc/bmalloc/SortedVector.h:150: Place brace on its own line for function definitions. [whitespace/braces] [4] Total errors found: 6 in 19 files If any of these errors are false positives, please file a bug against check-webkit-style.
Facebook sees the biggest impact because it allocates and frees some 2MB regions: facebook 473ms 252ms ^ 1.88x faster
Created attachment 272307 [details] Patch
Attachment 272307 [details] did not pass style-queue: ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:26: Found header this file implements before WebCore config.h. Should be: config.h, primary header, blank line, and then alphabetically sorted. [build/include_order] [4] ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:108: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:109: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:117: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:131: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/bmalloc/bmalloc/SortedVector.h:150: Place brace on its own line for function definitions. [whitespace/braces] [4] Total errors found: 6 in 20 files If any of these errors are false positives, please file a bug against check-webkit-style.
Created attachment 272309 [details] Patch
Attachment 272309 [details] did not pass style-queue: ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:26: Found header this file implements before WebCore config.h. Should be: config.h, primary header, blank line, and then alphabetically sorted. [build/include_order] [4] ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:108: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:109: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:117: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:131: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/bmalloc/bmalloc/SortedVector.h:150: Place brace on its own line for function definitions. [whitespace/braces] [4] Total errors found: 6 in 20 files If any of these errors are false positives, please file a bug against check-webkit-style.
Created attachment 272311 [details] Patch
Attachment 272311 [details] did not pass style-queue: ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:26: Found header this file implements before WebCore config.h. Should be: config.h, primary header, blank line, and then alphabetically sorted. [build/include_order] [4] ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:108: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:109: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:117: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/bmalloc/bmalloc/XLargeMap.cpp:131: Place brace on its own line for function definitions. [whitespace/braces] [4] ERROR: Source/bmalloc/bmalloc/SortedVector.h:156: Place brace on its own line for function definitions. [whitespace/braces] [4] Total errors found: 6 in 20 files If any of these errors are false positives, please file a bug against check-webkit-style.
Comment on attachment 272311 [details] Patch r=me (Should we worry about that 13% increase in peak on message_one?)
> (Should we worry about that 13% increase in peak on message_one?) message_one is multithreaded, so its peak memory is a unavoidably racy. I verified in a debugger that message_one does not perform XLarge allocations.
Committed r197174: <http://trac.webkit.org/changeset/197174>
Re-opened since this is blocked by bug 154762
This result from ios-simulator tests shows the two different crashes that started after this change was landed: <https://build.webkit.org/results/Apple%20iOS%209%20Simulator%20Release%20WK2%20(Tests)/r197214%20(3458)/results.html>
It looks like the crash is an ASSERT: JavaScriptCore[0x6c9b6e] <+62>: leaq 0x3fc000(%rax), %r14 JavaScriptCore[0x6c9b75] <+69>: leaq 0x1fffff(%rax), %r12 JavaScriptCore[0x6c9b7c] <+76>: andq $-0x200000, %r12 JavaScriptCore[0x6c9b83] <+83>: leaq 0x200000(%r12), %r15 JavaScriptCore[0x6c9b8b] <+91>: cmpq %r14, %r15 JavaScriptCore[0x6c9b8e] <+94>: ja 0x6c9c5b ; <+299> This corresponds to tryVMAllocate(): RELEASE_BASSERT(alignedEnd <= mappedEnd);
Values for 'mapped' (the mmap return value) when ASSERTing include: 0x0000000110202000 0x0000000112a01000 0x0000000115201000 0x0000000115801000 0x0000000119803000 0x000000011c001000 0x000000011c801000 0x0000000122402000 0x0000000122a02000 0x0000000128801000
The problem seems to be that the iOS simulator returns VM ranges that are not 16kB aligned. I suppose this could also happen on 32bit iOS devices, maybe?
Committed r197545: <http://trac.webkit.org/changeset/197545>