energy? 4 Achieving High Performance Demanded by End-User Conserving Energy Due to Limited Battery Capacity Conflicting requirements A mobile architecture
energy? 4 Achieving High Performance Demanded by End-User Conserving Energy Due to Limited Battery Capacity Conflicting requirements A mobile architecture WebCore:
▹Out-of-order (Silvermont, A15) or in-order (Saltwell, A7)? ▹Are existing general purpose mobile designs ideal? Customization: Find the Ideal General Purpose Baseline Architecture
▹Out-of-order (Silvermont, A15) or in-order (Saltwell, A7)? ▹Are existing general purpose mobile designs ideal? ▸Exhaustive design space exploration Customization: Find the Ideal General Purpose Baseline Architecture
▹Out-of-order (Silvermont, A15) or in-order (Saltwell, A7)? ▹Are existing general purpose mobile designs ideal? ▸Exhaustive design space exploration Customization: Find the Ideal General Purpose Baseline Architecture
▹Out-of-order (Silvermont, A15) or in-order (Saltwell, A7)? ▹Are existing general purpose mobile designs ideal? ▸Exhaustive design space exploration Customization: Find the Ideal General Purpose Baseline Architecture
▹PCs calculated from webpage-inherent and µarch-dependent features (~400 in total) Design Space Exploration (DSE) Setup 11 ▸Webpages selection using PCA 10-4 10-3 10-2 10-1 100 101 PC2 (log) -5 0 5 PC1 dominated by # webpage elements
▹PCs calculated from webpage-inherent and µarch-dependent features (~400 in total) ▹PCs calculated from webpage-inherent and µarch-dependent features (~400 in total) Design Space Exploration (DSE) Setup 11 ▸Webpages selection using PCA 10-4 10-3 10-2 10-1 100 101 PC2 (log) -5 0 5 PC1 dominated by IPC
the mobile Web ▸How does WebCore improve the energy-efficiency? ▹Customization ▹Specialization -Mitigate instruction delivery: Style resolution unit (SRU) -Improving data feeding: Browser engine cache ▸Evaluation Results ▸Related Work 16
Customized core IF ID MEM WB ALU MUL FPU SRU Style_apply(Id); Hardware Layer API Layer Runtime Layer Cache Management Software Failsafe SRU Access Browser Engine Cache
the mobile Web ▸How does WebCore improve the energy-efficiency? ▹Customization ▹Specialization -Mitigate instruction delivery: Style resolution unit (SRU) -Improving data feeding: Browser engine cache ▸Evaluation Results ▸Related Work 18
19 for (each rule in matchedRules) { for (each property in rule) { switch (property.id) { case Font: Style[Font] = Handler(property.value, DOMNode); break; case N: ...}}}
19 for (each rule in matchedRules) { for (each property in rule) { switch (property.id) { case Font: Style[Font] = Handler(property.value, DOMNode); break; case N: ...}}}
19 for (each rule in matchedRules) { for (each property in rule) { switch (property.id) { case Font: Style[Font] = Handler(property.value, DOMNode); break; case N: ...}}} Rule-level Parallelism (RLP)
19 for (each rule in matchedRules) { for (each property in rule) { switch (property.id) { case Font: Style[Font] = Handler(property.value, DOMNode); break; case N: ...}}} Rule-level Parallelism (RLP)
19 for (each rule in matchedRules) { for (each property in rule) { switch (property.id) { case Font: Style[Font] = Handler(property.value, DOMNode); break; case N: ...}}} Rule-level Parallelism (RLP) Property-level Parallelism (PLP) ▸Exploiting the parallelism to increase the arithmetic intensity and reduce instruction footprint
Property 3 id value id value id value Final Style Info ▸A running example from www.cnn.com Style Resolution Unit (2) Rule Property 1 Property 1 Property 2 Property 2 Rule id value id value 1 padding 0 margin 0 2 padding 6 px width 36 px Style Rules padding 0 width 6 px 36 px margin 0 High priority
Property 3 id value id value id value Final Style Info ▸A running example from www.cnn.com Style Resolution Unit (2) Rule Property 1 Property 1 Property 2 Property 2 Rule id value id value 1 padding 0 margin 0 2 padding 6 px width 36 px Style Rules padding 0 width 6 px 36 px margin 0 High priority
Property 3 id value id value id value Final Style Info ▸A running example from www.cnn.com Style Resolution Unit (2) Rule Property 1 Property 1 Property 2 Property 2 Rule id value id value 1 padding 0 margin 0 2 padding 6 px width 36 px Style Rules padding 0 width 6 px 36 px margin 0 High priority
Property 3 id value id value id value Final Style Info ▸A running example from www.cnn.com Style Resolution Unit (2) Rule Property 1 Property 1 Property 2 Property 2 Rule id value id value 1 padding 0 margin 0 2 padding 6 px width 36 px Style Rules padding 0 width 6 px 36 px margin 0 High priority
Property 3 id value id value id value Final Style Info ▸A running example from www.cnn.com Style Resolution Unit (2) Rule Property 1 Property 1 Property 2 Property 2 Rule id value id value 1 padding 0 margin 0 2 padding 6 px width 36 px Style Rules padding 0 width 6 px 36 px margin 0 High priority
Property 3 id value id value id value Final Style Info ▸A running example from www.cnn.com Style Resolution Unit (2) Rule Property 1 Property 1 Property 2 Property 2 Rule id value id value 1 padding 0 margin 0 2 padding 6 px width 36 px Style Rules padding 0 width 6 px 36 px margin 0 High priority
Property 3 id value id value id value Final Style Info ▸A running example from www.cnn.com Style Resolution Unit (2) Rule Property 1 Property 1 Property 2 Property 2 Rule id value id value 1 padding 0 margin 0 2 padding 6 px width 36 px Style Rules padding 0 width 6 px 36 px ▸Order Matters in RLP ▸Order Does Not Matter in PLP margin 0 High priority
Property 3 id value id value id value Final Style Info ▸A running example from www.cnn.com Style Resolution Unit (2) Rule Property 1 Property 1 Property 2 Property 2 Rule id value id value 1 padding 0 margin 0 2 padding 6 px width 36 px Style Rules padding 0 width 6 px 36 px ▸Order Matters in RLP ▸Order Does Not Matter in PLP margin 0 High priority
Property 3 id value id value id value Final Style Info ▸A running example from www.cnn.com Style Resolution Unit (2) Rule Property 1 Property 1 Property 2 Property 2 Rule id value id value 1 padding 0 margin 0 2 padding 6 px width 36 px Style Rules padding 0 width 6 px 36 px ▸Order Matters in RLP ▸Order Does Not Matter in PLP margin 0 High priority
Rule i.id ... Prop m ... Prop k ... Rule j.id ... ... ... ... ... start end start end Rule i Prop k Prop m Prop m Prop l Style l Style m Style k Style Resolution Unit (3) 21 ▸Order Matters in RLP ▸Order Does Not Matter in PLP
Rule i.id ... Prop m ... Prop k ... Rule j.id ... ... ... ... ... start end start end Rule i Prop k Prop m Prop m Prop l Style l Style m Style k Style Resolution Unit (3) 21 Input Scratchpad Memory ▸Order Matters in RLP ▸Order Does Not Matter in PLP
Rule i.id ... Prop m ... Prop k ... Rule j.id ... ... ... ... ... start end start end Rule i Prop k Prop m Prop m Prop l Style l Style m Style k Style Resolution Unit (3) 21 Input Scratchpad Memory ▸Order Matters in RLP ▸Order Does Not Matter in PLP Higher Priority
Rule i.id ... Prop m ... Prop k ... Rule j.id ... ... ... ... ... start end start end Rule i Prop k Prop m Prop m Prop l Style l Style m Style k Style Resolution Unit (3) 21 Input Scratchpad Memory Conflict Resolution ▸Order Matters in RLP ▸Order Does Not Matter in PLP Higher Priority
Rule i.id ... Prop m ... Prop k ... Rule j.id ... ... ... ... ... start end start end Rule i Prop k Prop m Prop m Prop l Style l Style m Style k Style Resolution Unit (3) 21 Input Scratchpad Memory Conflict Resolution ▸Order Matters in RLP ▸Order Does Not Matter in PLP Higher Priority Prop m Prop m
Rule i.id ... Prop m ... Prop k ... Rule j.id ... ... ... ... ... start end start end Rule i Prop k Prop m Prop m Prop l Style l Style m Style k Style Resolution Unit (3) 21 Input Scratchpad Memory Conflict Resolution ▸Order Matters in RLP ▸Order Does Not Matter in PLP Higher Priority Prop m
Rule i.id ... Prop m ... Prop k ... Rule j.id ... ... ... ... ... start end start end Rule i Prop k Prop m Prop m Prop l Style l Style m Style k Style Resolution Unit (3) 21 Input Scratchpad Memory Conflict Resolution Compute Lanes ▸Order Matters in RLP ▸Order Does Not Matter in PLP Higher Priority
Rule i.id ... Prop m ... Prop k ... Rule j.id ... ... ... ... ... start end start end Rule i Prop k Prop m Prop m Prop l Style l Style m Style k Style Resolution Unit (3) 21 Input Scratchpad Memory Output Scratchpad Memory Conflict Resolution Compute Lanes ▸Order Matters in RLP ▸Order Does Not Matter in PLP Higher Priority
2.2 2.4 Energy (J) Load Time (s) A15-like design Customization Specialization Cost of specialization: 0.59 mm2 area overhead Better than scaling- up approaches
2.2 2.4 Energy (J) Load Time (s) A15-like design Customization Specialization Cost of specialization: 0.59 mm2 area overhead Better than scaling- up approaches I$
2.2 2.4 Energy (J) Load Time (s) A15-like design Customization Specialization Cost of specialization: 0.59 mm2 area overhead Better than scaling- up approaches D$
2.2 2.4 Energy (J) Load Time (s) A15-like design Customization Specialization Cost of specialization: 0.59 mm2 area overhead Better than scaling- up approaches I+D$
platform that supports a wide range of mobile Web applications Customization allows us to find the ideal general-purpose baseline architecture Hardware/software collaborative specialization leverages application knowledge to mitigate inefficiencies in general-purpose architectures
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