High-Performance and EnergyEfficient Mobile Web Browsing on Big/Little Systems
Transcript
Yuhao Zhu Vijay Janapa Reddi Trinity Research Group The University of Texas at Austin
52.2% •SMS •Games •Music •Phone calls •etc
52.2% •SMS •Games •Music •Phone calls •etc
52.2% •SMS •Games •Music •Phone calls •etc
52.2% •SMS •Games •Music •Phone calls •etc
52.2% •SMS •Games •Music •Phone calls •etc
Internet Users 0 500 1000 1500 2000 2007 2009 2011E 2013E 2015E
Internet Users 0 500 1000 1500 2000 2007 2009 2011E 2013E 2015E
Internet Users 0 500 1000 1500 2000 2007 2009 2011E 2013E 2015E
ARM Cortex A9 @ 1.2 GHz
ARM Cortex A9 @ 1.2 GHz Client Network
GHz Webpages are becoming computationally intensive Compute Rendering Engine Network
GHz Webpages are becoming computationally intensive
Intensity Webpages are becoming computationally intensive
Intensity Webpages are becoming computationally intensive
Intensity Webpages are becoming computationally intensive
becoming computationally intensive Increasing Computational Intensity
@ 1.2 GHz Webpages are becoming computationally intensive Increasing Computational Intensity
performance objectives? 12 Mobile systems demand high performance! ARM Cortex A9 @ 1.2 GHz Webpages are becoming computationally intensive Increasing Computational Intensity
mobile system purely driven by performance objectives? 12 Mobile systems demand high performance! ARM Cortex A9 @ 1.2 GHz Webpages are becoming computationally intensive Increasing Computational Intensity
that guarantees both high performance and energy efficiency?
that guarantees both high performance and energy efficiency? Alternatives: Single big/little core; symmetric designs; asymmetric designs;
high performance and energy efficiency? Alternatives: Single big/little core; symmetric designs; asymmetric designs; Big/Little systems • Different microarchitectures (Big, OoO + little, in-order) • Different operating points (DVFS) 14 Executive Summary
high performance and energy efficiency? Alternatives: Single big/little core; symmetric designs; asymmetric designs; Big/Little systems • Different microarchitectures (Big, OoO + little, in-order) • Different operating points (DVFS) Key insight: Webpages have different characteristics that lead to load time and energy consumption variance 14 Executive Summary
high performance and energy efficiency? Alternatives: Single big/little core; symmetric designs; asymmetric designs; Big/Little systems • Different microarchitectures (Big, OoO + little, in-order) • Different operating points (DVFS) Key insight: Webpages have different characteristics that lead to load time and energy consumption variance 14 Solution: Predict <core, frequency> configuration and schedule webpages accordingly Executive Summary
Firefox • Excluded boot-strap and shut-down effects • Disabled browser cache • Hottest 5,000 webpages from www.alexa.com • Downloaded and mapped to the memory 15 Independent of the particular browser
issue (e.g. in Tegra 3-based tablets) PandaBoard ES Rev B1, 45nm DVFS: 350 MHz, 0.83 V DVFS: 700 MHz, 1.01 V DVFS: 920 MHz, 1.11 V DVFS: 1.2 GHz, 1.27 V 16
issue (e.g. in Tegra 3-based tablets) PandaBoard ES Rev B1, 45nm DVFS: 350 MHz, 0.83 V DVFS: 700 MHz, 1.01 V DVFS: 920 MHz, 1.11 V DVFS: 1.2 GHz, 1.27 V 16 < 3% run to run variation across 10 runs; use the median Built a current sensing circuitry to measure the voltage and energy of the SoC (isolate from other board peripherals)
issue (e.g. in Tegra 3-based tablets) PandaBoard ES Rev B1, 45nm DVFS: 350 MHz, 0.83 V DVFS: 700 MHz, 1.01 V DVFS: 920 MHz, 1.11 V DVFS: 1.2 GHz, 1.27 V 17 Little core: ARM Cortex A8: In-order with 2 issue (e.g. in Apple A4 -- iPhone 4) BeagleBoard xM, 45 nm DVFS: 300 MHz, 0.94 V DVFS: 600 MHz, 1.10 V DVFS: 800 MHz, 1.26 V
A9 350MHz A8 800MHz A8 600MHz A8 300MHz www.autoblog.com
A9 350MHz A8 800MHz A8 600MHz A8 300MHz www.autoblog.com
~40%
~40% Different operating frequencies
600MHz
600MHz ~80%
uarchitectures A8 600MHz ~80%
www.newegg.com www.autoblog.com
Systems? Different operating frequencies Different uarchitectures www.adobe.com www.newegg.com www.autoblog.com
the webpage variance? 22
leverage the big/little system to capture the webpage variance? 22
browsing? 23 Workload Characterization Performance/Energy Prediction Resource Management
the browser! 24
the browser! HTML (Structure) CSS (Style) 24
the browser! HTML (Structure) CSS (Style) Tag (h3, li, table, img) Attribute 24
the browser! HTML (Structure) CSS (Style) Selector Property Tag (h3, li, table, img) Attribute 24
instead of the browser! HTML (Structure) CSS (Style) Selector Property Tag (h3, li, table, img) Attribute 24
instead of the browser! HTML (Structure) CSS (Style) Selector Property Tag (h3, li, table, img) Attribute Tag (h3, li, table, img) HTML (Structure) 24
Webpages
www.163.com Webpages
of Tags (K) www.163.com Webpages
Webpages have different tag counts (instruction counts) 5 Number of Tags (K)
HTML tags (hot instructions) # Tags 30 5K sorted by #tags Webpages have different tag counts (instruction counts) 5 Number of Tags (K)
HTML tags (hot instructions) # Tags 30 5K sorted by #tags Webpages have different tag counts (instruction counts) 5 Number of Tags (K)
by #tags Webpages have a few hot HTML tags (hot instructions) Webpages have different tag counts (instruction counts) 5 Number of Tags (K)
by #tags Webpages have a few hot HTML tags (hot instructions) Webpages have different tag counts (instruction counts) 5 Number of Tags (K)
table img 0 175 350 525 700 Load time Energy ms mJ Webpages have a few hot HTML tags (hot instructions) Webpages have different tag counts (instruction counts)
table img 0 175 350 525 700 Load time Energy ms mJ Webpages have a few hot HTML tags (hot instructions) Webpages have different tag counts (instruction counts)
175 350 525 700 Load time Energy ms mJ Tag Processing Overhead Webpages have a few hot HTML tags (hot instructions) Webpages have different tag counts (instruction counts)
175 350 525 700 Load time Energy ms mJ Tag Processing Overhead Webpages have a few hot HTML tags (hot instructions) Webpages have different tag counts (instruction counts)
175 350 525 700 Load time Energy ms mJ HTML tags have different processing overhead (time & energy) Tag Processing Overhead Webpages have a few hot HTML tags (hot instructions) Webpages have different tag counts (instruction counts)
variance 36
mixes • Root cause of load time and energy variance 36
mixes 2. Individual HTML tags involve different processing overheads • Root cause of load time and energy variance 36
the time and energy of webpage loading? Workload Characterization
consumption (responses) using webpage characteristics (predictors) 38
hottest 2,500 webpages Model Construction and Refinement Start from the linear model and progressively refine it Model Validation Validating on another 2,500 webpages 39
HTML Number of each attribute Number of DOM tree nodes Number of rules CSS Number of each selector pattern Number of each property Content- dependent Total image size Content- dependent Total webpage size
HTML Number of each attribute Number of DOM tree nodes Number of rules CSS Number of each selector pattern Number of each property Content- dependent Total image size Content- dependent Total webpage size
Number of each attribute Number of DOM tree nodes Number of rules CSS Number of each selector pattern Number of each property Content- dependent Total image size Content- dependent Total webpage size 41
40 100 60 80 0 10 50 Error (%) 20
40 100 60 80 0 10 50 Error (%) 20
40 100 60 80 0 10 50 Error (%) 20 73.0% webpages < 10% error
40 100 60 80 0 10 50 Error (%) 20 73.0% webpages < 10% error 5.7% median error rate
40 100 60 80 0 10 50 Error (%) 20 73.0% webpages < 10% error 5.7% median error rate F(webpages) % 30 0 60 40 20 40 100 60 80 0 10 50 Error (%) 20
40 100 60 80 0 10 50 Error (%) 20 73.0% webpages < 10% error 5.7% median error rate F(webpages) % 30 0 60 40 20 40 100 60 80 0 10 50 Error (%) 20 Unoptimized models
20 40 100 60 80 0 10 50 Error (%) 20 F(webpages) % 100 80 60 40 20 0 0 10 20 30 40 50 60 Error (%) 70.0% webpages < 10% error 6.4% median error rate
Webpage-aware scheduling
time and energy for each <core, freq> conf. Normal webpage rendering Webpage-aware scheduling
~20ms [1] • Frequency scaling: ~3ms considering both HW/SW time [1] Big.LITTLE Processing with ARM Cortex-A15 & Cortex-A7. http://goo.gl/7mgbL Normal webpage rendering Webpage-aware scheduling
Webpage-aware scheduling
webpage rendering Webpage-aware scheduling
frequency on the big core (baseline)
frequency on the big core (baseline) • Our proposal: Webpage-aware scheduling (WS)
frequency on the big core (baseline) • OS DVFS strategies (OS) • Our proposal: Webpage-aware scheduling (WS)
frequency on the big core (baseline) • OS DVFS strategies (OS) • OS-Big • Our proposal: Webpage-aware scheduling (WS)
frequency on the big core (baseline) • OS DVFS strategies (OS) • OS-Big • OS-Little • Our proposal: Webpage-aware scheduling (WS)
frequency on the big core (baseline) • OS DVFS strategies (OS) • OS-Big • OS-Little • (Hypothetical) OS-Big/Little • Our proposal: Webpage-aware scheduling (WS)
100 Cut-off Violations (%) Energy Savings (%) Perf-oriented strategy as the baseline Results
50 75 100 Cut-off Violations (%) Energy Savings (%) Perf-oriented strategy as the baseline Results
0 25 50 75 100 Cut-off Violations (%) Energy Savings (%) Perf-oriented strategy as the baseline Results
WS 0 25 50 75 100 Cut-off Violations (%) Energy Savings (%) Perf-oriented strategy as the baseline Results
WS 0 25 50 75 100 Cut-off Violations (%) Energy Savings (%) Perf-oriented strategy as the baseline Results
WS 0 25 50 75 100 Cut-off Violations (%) Energy Savings (%) Perf-oriented strategy as the baseline Results
WS OS 0 25 50 75 100 Cut-off Violations (%) Energy Savings (%) Perf-oriented strategy as the baseline (Big+Little) Results Hypothetical
WS OS 0 25 50 75 100 Cut-off Violations (%) Energy Savings (%) Perf-oriented strategy as the baseline Results (Big+Little)
WS OS 0 25 50 75 100 Cut-off Violations (%) Energy Savings (%) Perf-oriented strategy as the baseline Results (Big+Little)
4.1% more cut-off violations Results Webpage-aware Scheduler
4.1% more cut-off violations • VS. (Hypothetical) Big/Little OS DVFS • 8.6% energy saving with minimal additional cut-off violations • 4.0% performance improvement Results Webpage-aware Scheduler
time and energy consumption Platform-dependent load time/energy prediction • 94.3% and 93.6% accuracy, respectively Big/little scheduling to effectively utilize the hardware resources • Significant energy saving over the performance-oriented strategy • Improve energy and performance over the Big/Little OS DVFS strategy
Yuhao Zhu (गᜏᚠ) Vijay Janapa Reddi Trinity Research Group The University of Texas at Austin
0 2 4 6 8 10 Page abandonment rate Page Abandonment [1] RD2: “The three second rule”. http://goo.gl/pynBl Source: Reproduced from Kissmetrics, 2011 Webpage load time (s)
energy saving (over perf.-oriented mode) Oracle Scheduler
(%) 86% same as oracle 4% under-prediction 10% over-prediction
0.6 0.3 0.0 F(webpages) E(Integrated) / E(WS)
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prop_z.index prop_top prop_left spec_high prop_right prop_bottom prop_caption.side prop_size tag_wbr tag_sub tag_canvas attr_onkeypress attr_accept tag_pre attr_ismap attr_nohref prop_voice.family attr_onmousedown prop_clip attr_hreflang prop_background.attachment prop_text.transform prop_word.spacing tag_abbr attr_accesskey attr_scheme attr_summary attr_noresize attr_span attr_accept.charset attr_onmousemove attr_rev attr_longdesc attr_charset tag_hgroup tag_menu tag_del tag_sup tag_blockquote prop_quotes tag_hr tag_ins attr_profile attr_version attr_link tag_dfn attr_onunload attr_clear attr_rules attr_defer prop_list.style.image tag_var prop_direction tag_b prop_outline.width attr_readonly attr_start tag_h6 attr_enctype attr_multiple attr_onkeyup attr_disabled tag_h5 tag_ol tag_h4 prop_unicode.bidi tag_colgroup tag_col prop_page.break.after prop_page.break.inside prop_widows prop_orphans tag_video tag_source attr_cite tag_q tag_mark prop_border.top.style prop_border.top.color prop_border.left.color prop_border.right.style prop_border.left.style prop_border.bottom.style prop_border.right.color prop_border.bottom.color prop_empty.cells prop_table.layout prop_list.style.position prop_border.collapse attr_nowrap attr_hspace attr_vspace attr_alink attr_vlink attr_text prop_font.stretch prop_font.size.adjust prop_font.variant tag_figure tag_figcaption attr_onload attr_datetime tag_time tag_article tag_aside tag_h1 tag_header tag_footer tag_nav tag_section prop_min.width prop_outline.color attr_headers attr_abbr tag_code tag_address attr_classid attr_codebase tag_embed tag_object tag_param attr_scope tag_caption tag_thead tag_th tag_cite attr_rows attr_cols tag_s attr_coords tag_area attr_shape tag_map attr_usemap tag_style tag_noscript tag_body prop_visibility prop_border.right prop_list.style.type prop_padding.right prop_letter.spacing attr_onmouseup attr_id attr_data img_size tot_size tag_br attr_checked attr_tabindex attr_valuetype tag_fieldset tag_legend 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prop_font.weight prop_text.decoration prop_font.size prop_color emb_sel_cnt attr_style attr_colspan tag_tr tag_td attr_rowspan attr_height attr_width attr_bgcolor attr_border attr_align attr_valign attr_cellpadding attr_cellspacing tag_tbody tag_table attr_background attr_dir attr_http.equiv attr_color attr_size attr_noshade attr_face prop_border.style prop_border.width prop_vertical.align prop_max.width prop_max.height prop_min.height prop_border.color prop_border.bottom.width prop_border.top.width prop_border.left.width prop_border.right.width attr_onmouseout attr_onmouseover attr_label tag_optgroup attr_language tag_u prop_content tag_textarea tag_head tag_html tag_samp tag_dt tag_dl tag_i tag_dd tag_em attr_target attr_rel attr_lang tag_title attr_content tag_meta tag_button tag_tfoot prop_outline.style attr_media tag_link tag_legend tag_fieldset attr_valuetype attr_tabindex attr_checked tag_br tot_size img_size attr_data attr_id attr_onmouseup prop_letter.spacing prop_padding.right prop_list.style.type prop_border.right prop_visibility tag_body tag_noscript tag_style attr_usemap tag_map attr_shape tag_area attr_coords tag_s attr_cols attr_rows tag_cite tag_th tag_thead tag_caption attr_scope tag_param tag_object tag_embed attr_codebase attr_classid tag_address tag_code attr_abbr attr_headers prop_outline.color prop_min.width tag_section tag_nav tag_footer tag_header tag_h1 tag_aside tag_article tag_time attr_datetime attr_onload tag_figcaption tag_figure prop_font.variant prop_font.size.adjust prop_font.stretch attr_text attr_vlink attr_alink attr_vspace attr_hspace attr_nowrap prop_border.collapse prop_list.style.position prop_table.layout prop_empty.cells prop_border.bottom.color prop_border.right.color prop_border.bottom.style prop_border.left.style prop_border.right.style prop_border.left.color prop_border.top.color prop_border.top.style tag_mark tag_q attr_cite tag_source tag_video prop_orphans prop_widows prop_page.break.inside 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prop_margin.right prop_margin.bottom prop_background.color prop_cursor prop_clear prop_border.top prop_border.bottom prop_padding.top prop_padding.left prop_padding.bottom prop_margin.top prop_margin.left prop_list.style prop_text.shadow prop_font prop_border.spacing prop_font.style prop_outline static_extint_sel_cnt prop_background.image prop_background.repeat prop_text.indent prop_background.position tag_iframe attr_frameborder attr_scrolling attr_marginwidth attr_marginheight attr_onfocus attr_onblur attr_onsubmit attr_maxlength attr_onkeydown attr_onchange attr_value tag_option tag_select attr_selected attr_name attr_onclick attr_action attr_method tag_form tag_input tag_label attr_for attr_type tag_script depth tag_a attr_href node attr_class tag_div time energy tag_span attr_title tag_ul tag_li tag_strong tag_h2 tag_p tag_h3 attr_src tag_img attr_alt prop_border.left prop_white.space tag_small prop_overflow dyn_extint_sel_cnt spec_med prop_line.height prop_border spec_low 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prop_orphans tag_video tag_source attr_cite tag_q tag_mark prop_border.top.style prop_border.top.color prop_border.left.color prop_border.right.style prop_border.left.style prop_border.bottom.style prop_border.right.color prop_border.bottom.color prop_empty.cells prop_table.layout prop_list.style.position prop_border.collapse attr_nowrap attr_hspace attr_vspace attr_alink attr_vlink attr_text prop_font.stretch prop_font.size.adjust prop_font.variant tag_figure tag_figcaption attr_onload attr_datetime tag_time tag_article tag_aside tag_h1 tag_header tag_footer tag_nav tag_section prop_min.width prop_outline.color attr_headers attr_abbr tag_code tag_address attr_classid attr_codebase tag_embed tag_object tag_param attr_scope tag_caption tag_thead tag_th tag_cite attr_rows attr_cols tag_s attr_coords tag_area attr_shape tag_map attr_usemap tag_style tag_noscript tag_body prop_visibility prop_border.right prop_list.style.type prop_padding.right prop_letter.spacing attr_onmouseup attr_id attr_data img_size tot_size tag_br attr_checked attr_tabindex attr_valuetype tag_fieldset tag_legend tag_link attr_media prop_outline.style tag_tfoot tag_button tag_meta attr_content tag_title attr_lang attr_rel attr_target tag_em tag_dd tag_i tag_dl tag_dt tag_samp tag_html tag_head tag_textarea prop_content tag_u attr_language tag_optgroup attr_label attr_onmouseover attr_onmouseout prop_border.right.width prop_border.left.width prop_border.top.width prop_border.bottom.width prop_border.color prop_min.height prop_max.height prop_max.width prop_vertical.align prop_border.width prop_border.style attr_face attr_noshade attr_size attr_color attr_http.equiv attr_dir attr_background tag_table tag_tbody attr_cellspacing attr_cellpadding attr_valign attr_align attr_border attr_bgcolor attr_width attr_height attr_rowspan tag_td tag_tr attr_colspan attr_style emb_sel_cnt prop_color prop_font.size prop_text.decoration prop_font.weight prop_font.family attr_align tag_tr attr_height attr_width attr_bgcolor attr_border attr_valign attr_cellpadding attr_cellspacing tag_tbody tag_table prop_color emb_sel_cnt attr_style prop_overflow tag_small prop_white.space prop_border.left attr_colspan tag_td attr_alt tag_img attr_src attr_dir attr_http.equiv attr_color attr_face attr_size prop_border.style prop_border.width prop_vertical.align prop_max.height prop_min.height prop_max.width prop_background.position prop_background.image prop_text.indent prop_background.repeat prop_outline prop_font.style static_extint_sel_cnt prop_min.width prop_font prop_text.shadow prop_list.style tag_body attr_onclick tag_noscript tag_style prop_border.color attr_tabindex prop_visibility prop_letter.spacing prop_padding.right prop_list.style.type prop_border.right attr_shape tag_area attr_coords tag_th attr_media tag_link tag_button tag_h4 tag_ol tag_h5 attr_rel attr_lang tag_title tag_meta attr_content attr_data attr_id tag_br attr_label attr_language attr_onmouseout attr_onmouseover tag_dd tag_dt tag_dl attr_target tag_em tag_i prop_content tag_head tag_html tag_h1 tag_section tag_article prop_text.transform prop_border.collapse tag_h6 attr_onmousedown attr_charset tag_b tag_hr tag_param tag_div attr_class node attr_href tag_a attr_scrolling attr_frameborder tag_iframe tag_strong tot_size img_size tag_h2 tag_h3 tag_p tag_ul tag_li attr_title tag_span energy time depth tag_script attr_type attr_maxlength attr_for tag_label attr_onfocus tag_select tag_option attr_value attr_name tag_input attr_method attr_action tag_form prop_font.family prop_font.weight prop_text.decoration prop_font.size prop_margin.left prop_margin.top prop_padding.bottom prop_padding.left prop_padding.top prop_border.bottom prop_border.top prop_margin.bottom prop_clear prop_cursor prop_background.color prop_margin.right prop_text.align prop_float prop_line.height prop_bottom prop_right prop_left prop_top prop_z.index prop_position prop_display prop_padding prop_background prop_margin spec_high spec_low prop_border spec_med dyn_extint_sel_cnt prop_height prop_width prop_width prop_height dyn_extint_sel_cnt spec_med prop_border spec_low spec_high prop_margin prop_background prop_padding prop_display prop_position prop_z.index prop_top prop_left prop_right prop_bottom prop_line.height prop_float prop_text.align prop_margin.right prop_background.color prop_cursor prop_clear prop_margin.bottom prop_border.top prop_border.bottom prop_padding.top prop_padding.left prop_padding.bottom prop_margin.top prop_margin.left prop_font.size prop_text.decoration prop_font.weight prop_font.family tag_form attr_action attr_method tag_input attr_name attr_value tag_option tag_select attr_onfocus tag_label attr_for attr_maxlength attr_type tag_script depth time energy tag_span attr_title tag_li tag_ul tag_p tag_h3 tag_h2 img_size tot_size tag_strong tag_iframe attr_frameborder attr_scrolling tag_a attr_href node attr_class tag_div tag_param tag_hr tag_b attr_charset attr_onmousedown tag_h6 prop_border.collapse prop_text.transform tag_article tag_section tag_h1 tag_html tag_head prop_content tag_i tag_em attr_target tag_dl tag_dt tag_dd attr_onmouseover attr_onmouseout attr_language attr_label tag_br attr_id attr_data attr_content tag_meta tag_title attr_lang attr_rel tag_h5 tag_ol tag_h4 tag_button tag_link attr_media tag_th attr_coords tag_area attr_shape prop_border.right prop_list.style.type prop_padding.right prop_letter.spacing prop_visibility attr_tabindex prop_border.color tag_style tag_noscript attr_onclick tag_body prop_list.style prop_text.shadow prop_font prop_min.width static_extint_sel_cnt prop_font.style prop_outline prop_background.repeat prop_text.indent prop_background.image prop_background.position prop_max.width prop_min.height prop_max.height prop_vertical.align prop_border.width prop_border.style attr_size attr_face attr_color attr_http.equiv attr_dir attr_src tag_img attr_alt tag_td attr_colspan prop_border.left prop_white.space tag_small prop_overflow attr_style emb_sel_cnt prop_color tag_table tag_tbody attr_cellspacing attr_cellpadding attr_valign attr_border attr_bgcolor attr_width attr_height tag_tr attr_align prop_min.width prop_margin prop_margin.bottom prop_margin.right prop_margin.left prop_margin.top prop_max.height prop_max.width prop_min.height prop_min.height prop_max.width prop_max.height prop_margin.top prop_margin.left prop_margin.right prop_margin.bottom prop_margin prop_min.width
0.2 0.0 76 Energy Saving
0.2 0.0 76 ~83.0% Energy Saving
0.2 0.0 76 ~83.0% Energy Saving
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