97910 2012-09-28 07:12:50 -0700 [SVG] Use references are much slower than necessary 2012-10-01 01:12:23 -0700 1 1 1 Unclassified WebKit SVG 528+ (Nightly build) Unspecified Unspecified NEW P2 Normal --- 1 blambov fmalita fmalita pdr schenney zimmermann oldest_to_newest 730628 0 166245 blambov 2012-09-28 07:12:50 -0700 Created attachment 166245 Example setting href attribute The attached files contain a hierarchy of 'use' elements to build a graphic containing a few hundred triangles. It is not a problem for Chrome to render the graphic fluidly (use-levels-move), but if a new 'use' element references the graphic (use-levels-new-use), or the element's 'href' is changed (use-levels-set-href), the performance falls dramatically. WebKit is copying the elements referenced by 'use', which should not be necessary at all. In other tests we have seen that it is actually faster to explicitly recreate referenced nodes with JavaScript than to refer to them with 'use' elements. Opera does not have this problem, and runs all these examples at ~50 fps. 730629 1 166246 blambov 2012-09-28 07:13:24 -0700 Created attachment 166246 Example creating new 'use' element 730631 2 166247 blambov 2012-09-28 07:15:50 -0700 Created attachment 166247 Example without changing reference, demonstrating what the performance should be 730657 3 fmalita 2012-09-28 07:57:34 -0700 (In reply to comment #0) > WebKit is copying the elements referenced by 'use', which should not be necessary at all. Deep cloning is likely needed to support full <use> semantics - see http://www.w3.org/TR/SVG/struct.html#UseElement But the profile for the slow tests does seem odd - most cycles wasted in synchronization and string manipulation code: 2.77% chrome libpthread-2.15.so [.] pthread_mutex_unlock 2.59% chrome libpthread-2.15.so [.] pthread_mutex_lock 1.36% swapper [kernel.kallsyms] [k] mwait_idle_with_hints 1.35% chrome libwebkit.so [.] WTF::StringHasher::addCharactersToHash(unsigned short, unsigned short) 1.25% chrome libwebkit.so [.] WTF::intHash(unsigned long) 1.10% chrome libwebkit.so [.] WTF::OwnPtr<WTF::Mutex>::operator*() const 1.05% chrome libwebkit.so [.] WTF::Locker<WTF::Mutex>::Locker(WTF::Mutex&) 0.96% chrome libwebkit.so [.] WTF::Mutex::lock() 0.94% chrome libwebkit.so [.] WebCore::Node::getFlag(WebCore::Node::NodeFlags) const 0.79% chrome libwebkit.so [.] WTF::ThreadRestrictionVerifier::isSafeToUse() const 0.76% chrome libwebkit.so [.] WTF::RefPtr<WTF::StringImpl>::get() const 0.73% chrome chrome [.] (anonymous namespace)::FL_Previous_No_Check(void*) 0.71% chrome libwebkit.so [.] unsigned int WTF::StringHasher::computeHashAndMaskTop8Bits<unsigned short, &(WTF::StringHasher::defaultConverter(unsi 0.63% chrome libpthread-2.15.so [.] pthread_getspecific 0.58% chrome chrome [.] PackedCache<36, unsigned long>::GetOrDefault(unsigned long, unsigned long) const 0.57% chrome libwebkit.so [.] WebCore::Node::document() const 0.50% chrome chrome [.] TCMalloc_PageMap3<36>::get(unsigned long) const 0.50% chrome libwebkit.so [.] bool WTF::IdentityHashTranslator<WTF::PtrHash<WebCore::SVGElement*> >::equal<WebCore::SVGElement*>(WebCore::SVGElemen 0.48% chrome libwebkit.so [.] WTF::Mutex::unlock() 0.47% cinnamon [kernel.kallsyms] [k] audit_filter_syscall 0.46% chrome libwebkit.so [.] WTF::ThreadIdentifierData::identifier() 0.44% chrome libc-2.15.so [.] __memset_sse2 0.44% chrome chrome [.] base::subtle::Acquire_Load(long const volatile*) 0.44% chrome chrome (deleted) [.] 0x3255b0f 0.39% chrome libwebkit.so [.] WTF::String::impl() const 0.38% chrome libwebkit.so [.] WTF::Locker<WTF::Mutex>::~Locker() 0.37% chrome libwebkit.so [.] void WTF::addIterator<WebCore::SVGElement*, WTF::KeyValuePair<WebCore::SVGElement*, WTF::OwnPtr<WTF::HashSet<WebCore: 0.37% chrome libwebkit.so [.] WTF::RefCountedBase::derefBase() 0.35% chrome chrome [.] CheckCachedSizeClass(void*) 0.32% chrome libwebkit.so [.] WebCore::RenderObject::document() const 0.32% chrome chrome [.] (anonymous namespace)::MaskPtr(void*) 0.32% chrome libwebkit.so [.] WTF::StringHasher::defaultConverter(unsigned short) 0.31% chrome libwebkit.so [.] WTF::doubleHash(unsigned int) 0.31% chrome libwebkit.so [.] WTF::RefCountedBase::ref() 0.28% chrome libwebkit.so [.] void WTF::removeIterator<WebCore::SVGElement*, WTF::KeyValuePair<WebCore::SVGElement*, WTF::OwnPtr<WTF::HashSet<WebCo 0.27% chrome libwebkit.so [.] WTF::currentThread() 0.27% chrome libwebkit.so [.] WTF::StringHasher::avalancheBits() const 731459 4 zimmermann 2012-10-01 01:12:23 -0700 See 97905 comment #4 for a way out of this mess. 166245 2012-09-28 07:12:50 -0700 2012-09-28 07:12:50 -0700 Example setting href attribute use-levels-set-href.svg image/svg+xml 3558 blambov PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtbG5zOnhsaW5rPSJodHRw Oi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rIiB2ZXJzaW9uPSIxLjEiIHN0eWxlPSJwb2ludGVyLWV2 ZW50czogbm9uZTsgd2lkdGg6IDU1MHB4OyBoZWlnaHQ6IDQwMHB4OyI+CiAgICA8ZGVmcz4KICAg ICAgICAgICAgPGcgaWQ9InVuaXQiPgoJCTxwb2x5Z29uIHBvaW50cz0iMCwwIDEwLDAgNSw4LjY2 MDI1NDAzNzg0NDM5Ii8+CSAgICAKCSAgICA8L2c+CgogICAgICAgICAgICA8ZyBpZD0icSI+CiAg ICAgICAgICAgICAgPHVzZSB4bGluazpocmVmPSIjdW5pdCIgeD0iMTAiIHk9IjAiIGZpbGw9InJl ZCIvPgogICAgICAgICAgICAgIDx1c2UgeGxpbms6aHJlZj0iI3VuaXQiIHRyYW5zZm9ybT0idHJh bnNsYXRlKDEwLDApIHJvdGF0ZSg2MCkiIGZpbGw9ImdyZWVuIi8+CiAgICAgICAgICAgICAgPHVz ZSB4bGluazpocmVmPSIjdW5pdCIgdHJhbnNmb3JtPSJ0cmFuc2xhdGUoMTAsMCkgcm90YXRlKDEy 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