136 lines
8.8 KiB
Plaintext
136 lines
8.8 KiB
Plaintext
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[video member=miotatsu stream_platform=twitch project=book title="1.7 & 1.8" vod_platform=youtube id=J4grCXyJxp4 annotator=Miblo]
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[0:09][Recap last time's reading on :performance measurements]
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[0:38][@riskyfive][o/]
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[0:43][A few words on benchmarking and rigorously choosing a sample size[ref
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site=Wikipedia
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page="Checking whether a coin is fair"
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url=https://en.wikipedia.org/wiki/Checking_whether_a_coin_is_fair]][:performance]
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[3:40][@riskyfive][Learning statistics from Wikipedia is hard. The definitions are kind of circular. They are easy to understand after you learn stats somewhere else]
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[3:58][Estimator of true probability[ref
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site=Wikipedia
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page="Checking whether a coin is fair"
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url=https://en.wikipedia.org/wiki/Checking_whether_a_coin_is_fair]][:research]
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[5:01][Some insights on :performance timing from Andrei Alexandrescu[ref
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site=YouTube
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page="code::dive conference 2015 - Andrei Alexandrescu - Writing Fast Code I"
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url=https://www.youtube.com/watch?v=vrfYLlR8X8k]]
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[10:45][@riskyfive][I once argued that in a college project report. The professor wasn't very convinced. These days I would say choose a low percentile (the minimum would be the 0 percentile) and show the probability distribution]
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[12:14][On using proxies to measure :performance[ref
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site=YouTube
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page="code::dive conference 2015 - Andrei Alexandrescu - Writing Fast Code I"
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url=https://www.youtube.com/watch?v=vrfYLlR8X8k]]
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[13:20][Fix up the time formula][:blackboard]
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[15:19][Chapter 1.7 - The Power Wall[ref
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title="Computer Organization and Design RISC-V Edition"
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author="David Patterson & John Hennessy"
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publisher="Morgan Kaufmann"
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isbn=9780128122754
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url=https://www.elsevier.com/books/computer-organization-and-design-risc-v-edition/patterson/978-0-12-812275-4]][:hardware :research]
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[15:45][Figure 1.16 - Clock rate and power for Intel x86 microprocessors over eight generations and 30 years[ref
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title="Computer Organization and Design RISC-V Edition"
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author="David Patterson & John Hennessy"
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publisher="Morgan Kaufmann"
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isbn=9780128122754
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url=https://www.elsevier.com/books/computer-organization-and-design-risc-v-edition/patterson/978-0-12-812275-4]][:hardware :research]
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[19:47][Chapter 1.7, on energy and power[ref
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title="Computer Organization and Design RISC-V Edition"
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author="David Patterson & John Hennessy"
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publisher="Morgan Kaufmann"
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isbn=9780128122754
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url=https://www.elsevier.com/books/computer-organization-and-design-risc-v-edition/patterson/978-0-12-812275-4]][:hardware :performance :research]
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[21:53][@riskyfive][It means proportional to]
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[22:07][Energy equations][:blackboard]
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[23:48][Chapter 1.7, on proportional energy[ref
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title="Computer Organization and Design RISC-V Edition"
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author="David Patterson & John Hennessy"
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publisher="Morgan Kaufmann"
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isbn=9780128122754
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url=https://www.elsevier.com/books/computer-organization-and-design-risc-v-edition/patterson/978-0-12-812275-4]][:hardware :performance :research]
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[24:16][Pulse energy and power][:blackboard :hardware :performance]
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[27:11][Chapter 1.7, frequency switched as a function of the clock rate[ref
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title="Computer Organization and Design RISC-V Edition"
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author="David Patterson & John Hennessy"
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publisher="Morgan Kaufmann"
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isbn=9780128122754
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url=https://www.elsevier.com/books/computer-organization-and-design-risc-v-edition/patterson/978-0-12-812275-4]][:hardware :performance :research]
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[27:35][@riskyfive][This is easy to imagine. Voltage is like pressure. You have pressure when the bucket is full. To change from high pressure (full/1) to low pressure (empty/0) you have to discharge the bucket. The size of the bucket (capacitive load) is what gets wasted, in proportion to the pressure with which the water came out]
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[28:22][Chapter 1.7, on the different growth factors of clock rate and power[ref
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title="Computer Organization and Design RISC-V Edition"
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author="David Patterson & John Hennessy"
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publisher="Morgan Kaufmann"
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isbn=9780128122754
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url=https://www.elsevier.com/books/computer-organization-and-design-risc-v-edition/patterson/978-0-12-812275-4]][:hardware :performance :research]
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[29:12][Chapter 1.7, Example: Relative Power[ref
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title="Computer Organization and Design RISC-V Edition"
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author="David Patterson & John Hennessy"
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publisher="Morgan Kaufmann"
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isbn=9780128122754
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url=https://www.elsevier.com/books/computer-organization-and-design-risc-v-edition/patterson/978-0-12-812275-4]][:hardware :performance :research]
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[31:58][Power ratio][:blackboard :hardware :performance]
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[35:08][Chapter 1.7, power leakage and distribution[ref
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title="Computer Organization and Design RISC-V Edition"
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author="David Patterson & John Hennessy"
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publisher="Morgan Kaufmann"
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isbn=9780128122754
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url=https://www.elsevier.com/books/computer-organization-and-design-risc-v-edition/patterson/978-0-12-812275-4]][:hardware :performance :research]
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[38:20][Chapter 1.8 - The Sea Change: The Switch from Uniprocessors to Multiprocessors[ref
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title="Computer Organization and Design RISC-V Edition"
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author="David Patterson & John Hennessy"
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publisher="Morgan Kaufmann"
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isbn=9780128122754
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url=https://www.elsevier.com/books/computer-organization-and-design-risc-v-edition/patterson/978-0-12-812275-4]][:hardware :performance :research]
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[40:41][A few words on eschewing reliance on more powerful hardware being a driving factor of the Handmade Network]
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[43:15][@miblo][Culture of laziness, or of "disengagement", perhaps?]
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[43:26][A few words on cultural differences of software companies]
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[45:25][Chapter 1.8, quote from Brian Hayes on scoring music for a solo performer vs an orchestra[ref
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title="Computer Organization and Design RISC-V Edition"
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author="David Patterson & John Hennessy"
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publisher="Morgan Kaufmann"
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isbn=9780128122754
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url=https://www.elsevier.com/books/computer-organization-and-design-risc-v-edition/patterson/978-0-12-812275-4]][:hardware :performance :research]
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[46:08][Chapter 1.8, Hardware / Software Interface[ref
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title="Computer Organization and Design RISC-V Edition"
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author="David Patterson & John Hennessy"
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publisher="Morgan Kaufmann"
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isbn=9780128122754
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url=https://www.elsevier.com/books/computer-organization-and-design-risc-v-edition/patterson/978-0-12-812275-4]][:hardware :performance :research]
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[47:35][Figure 1.17 - Growth in processor performance since the mid-1980s[ref
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title="Computer Organization and Design RISC-V Edition"
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author="David Patterson & John Hennessy"
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publisher="Morgan Kaufmann"
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isbn=9780128122754
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url=https://www.elsevier.com/books/computer-organization-and-design-risc-v-edition/patterson/978-0-12-812275-4]][:hardware :performance :research]
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[50:45][A discussion point on explicit and implicit parallel programming][:optimisation]
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[52:59][@riskyfive][Auto vectorization?]
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[53:19][On using parallelism in D][:language :optimisation]
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[55:57][@riskyfive][I'm not aware of any convincing path to some magic bullet solution]
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[56:18][On pure functional programming in Haskell][:language]
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[57:44][Chapter 1.8, on the difficulty to write explicitly parallel programs[ref
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title="Computer Organization and Design RISC-V Edition"
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author="David Patterson & John Hennessy"
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publisher="Morgan Kaufmann"
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isbn=9780128122754
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url=https://www.elsevier.com/books/computer-organization-and-design-risc-v-edition/patterson/978-0-12-812275-4]][:hardware :performance :research]
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[1:00:20][Chapter 1.8, summaries of parallelism throughout the book[ref
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title="Computer Organization and Design RISC-V Edition"
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author="David Patterson & John Hennessy"
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publisher="Morgan Kaufmann"
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isbn=9780128122754
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url=https://www.elsevier.com/books/computer-organization-and-design-risc-v-edition/patterson/978-0-12-812275-4]][:hardware :performance :research]
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[1:03:30][Chapter 1.8, preview of Chapter 6 on parallel programming[ref
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title="Computer Organization and Design RISC-V Edition"
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author="David Patterson & John Hennessy"
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publisher="Morgan Kaufmann"
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isbn=9780128122754
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url=https://www.elsevier.com/books/computer-organization-and-design-risc-v-edition/patterson/978-0-12-812275-4]][:hardware :performance :research]
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[1:05:03][Chapter 1.8, quote from J. Presper Eckert on computers in general[ref
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title="Computer Organization and Design RISC-V Edition"
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author="David Patterson & John Hennessy"
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publisher="Morgan Kaufmann"
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isbn=9780128122754
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url=https://www.elsevier.com/books/computer-organization-and-design-risc-v-edition/patterson/978-0-12-812275-4]][:research]
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[1:05:48][We're out of time for today]
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[1:06:48][@riskyfive][By the way, I asked [@cmuratori Casey Muratori] about porting [~hero Handmade Hero] to an FPGA-based system (like mine) instead of / in addition to the Raspberry Pi. He said cool, email me. I did, but I haven't heard back]
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[1:07:17][Stay RISCY, everyone!]
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[/video]
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