Update EIP-1108 with latest gas metering benchmarks #1987

zac-williamson · 2019-05-03T11:06:43Z

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eip-automerger · 2019-05-03T11:09:39Z

Hi! I'm a bot, and I wanted to automerge your PR, but couldn't because of the following issue(s):

EIP 1108 requires approval from one of (@Shadowfiend)

Shadowfiend

Awesome updates, thanks for adding a great mix of qualitative and quantitative justification!

Not sure what preferences are in this particular repo (@axic, perhaps?) but a couple of things I might tweak before merging:

Avoiding first person (we).
Clearer commit message, PR title, description.
Consistency in references to zk-SNARKs (typically I've seen zk-SNARK as the capitalization/punctuation of choice).

I left some suggested changes for the zk-SNARK and first person thing that should be easy to include. I actually also noticed the original EIP has a first person reference, which I'll probably fix once this PR goes in.

I'll give the EIP folks a day (or maybe the weekend <_<) to speak up if anything else needs tweaking and then probably merge in whatever is here.

EIPS/eip-1108.md

zac-williamson · 2019-05-03T13:28:49Z

Heya @Shadowfiend

Thanks for the feedback! I've committed your changes, let me know if you have any other suggestions.

- Several optimizations have been made to the Parity bn create - EIP-1108 references benchmarks that utilize this optimization - Projected gas costs have been updated to reflect benchmark - (benchmark at https://gist.github.com/zac-williamson/838419a3da179d47d31b25b586c15e53) - Added descriptions of projects that would benefit from EIP-1108, and how they could utilize this EIP

Co-Authored-By: zac-williamson <blorktronics@gmail.com>

zac-williamson · 2019-05-03T13:45:08Z

I've updated the PR and the commit message to be more descriptive of the changes in this PR

Shadowfiend · 2019-05-03T14:07:53Z

EIPS/eip-1108.md

 used by the [Parity client](https://github.com/paritytech/parity-ethereum) led to a 
 significant performance boost we 
 [benchmarked](https://gist.github.com/pdyraga/4649b74436940a01e8221d85e80bfeef) 
 and compared against the [previous 
-results](https://github.com/ethereum/benchmarking/blob/master/constantinople/analysis2.md). 
+results](https://gist.github.com/zac-williamson/838410a3da179d47d31b25b586c15e53).  


Oh actually I think the link here is flipped---the [benchmarked] link needs to change, while the [previous results] link should continue to reflect the original analysis that set the current gas price.

Thanks for spotting that! I switched the links over

axic · 2019-05-03T15:15:06Z

EIPS/eip-1108.md

+
+Fast elliptic curve cryptography is a keystone of a growing number of protocols built on top of Ethereum. To list a few:  
+
+  [The AZTEC protocol](https://github.com/AztecProtocol/AZTEC) utilizes the elliptic curve precompiles to construct private tokens, with zero-knowledge transaction logic, via the [ERC1723](https://github.com/ethereum/EIPs/issues/1723) and [ERC1724](https://github.com/ethereum/EIPs/issues/1724) standard.  


Can you make these into a bullet point list? It would look nicer that way after formatting.

axic · 2019-05-03T15:16:00Z

EIPS/eip-1108.md

+  [The AZTEC protocol](https://github.com/AztecProtocol/AZTEC) utilizes the elliptic curve precompiles to construct private tokens, with zero-knowledge transaction logic, via the [ERC1723](https://github.com/ethereum/EIPs/issues/1723) and [ERC1724](https://github.com/ethereum/EIPs/issues/1724) standard.  
+  [Matter Labs](https://github.com/matter-labs/matter-network) utilizes the precompiles to implement Ignis, a scaling solution with a throughput of 500txns per second  
+  [Rollup](https://github.com/rollup/rollup) utilizes the precompiles to create L2 scaling solutions, where the correctness of transactions is gauranteed by main-net, without an additional consensus layer  
+  [ZEther](https://crypto.stanford.edu/~buenz/papers/zether.pdf) uses precompiles `0x06` and `0x07` to construct confidential transactions  


This is nitpicking, but above you define what precompiles the addresses 0x6 and 0x7 refer to. Maybe it is easier to read if you use ECADD and ECMUL here.

Pushed a change that uses ECADD and ECMUL

axic · 2019-05-03T15:17:42Z

EIPS/eip-1108.md


 The gas costs for `ECADD` and `ECMUL` are updates to the costs listed in
 EIP-196, while the gas costs for the pairing check are updates to the cost
 listed in EIP-197. Updated gas costs have been adjusted to the less performant 
-client which is Parity, according to benchmarks<sup>[3]</sup>.
+client which is Parity, according to benchmarks<sup>[3]</sup>. The updated gas costs are scaled relative to the `ecrecover` precompile.


Can you explain how it is relative to ecrecover?

I pushed a change that describes the ecrecover scaling. The ecrecover precompile took 116 microseconds to run in the benchmark. If we assume the ecrecover gas price of 3,000 gas is a fair price, we get a price of 25.86 gas per microsecond of an precompile algorithm's run-time.

The pairing precompile took 3,037 microseconds to compute 1 pairing, and 14,663 microseconds to compute 10 pairings. From this, the pairing algorithm has a fixed 'base' run-time of 1,745 microseconds, plus 1,292 microseconds per pairing. We can split the run-time into 'fixed cost' and 'linear cost per pairing' components because of the structure of the algorithm.

Then using a 'fair' price of 25.86 gas per microsecond, we get a gas formula of ~35,000 * k + 45,000 gas, where k is the number of pairings being computed.

n.b. of course, I am also making an explicit assumption that the run-time ratios between ecrecover and the pairing precompile are constant irrespective of the specs or architecture of the underlying machine. I think this is a reasonable assumption, as the arithmetic operations being performed are extremely similar (modular multiplications in 256 bit finite fields). However more benchmarks would be useful here.

@zac-williamson @Shadowfiend I think it would be nice to include the above text in the EIP. Can you add it?

I believe it's in there, right? @ https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1108.md#specification, ‘i.e. in the benchmark…’

Some of it is, but this is a more comprehensive description.

axic · 2019-05-03T15:21:52Z

EIPS/eip-1108.md

-results](https://github.com/ethereum/benchmarking/blob/master/constantinople/analysis2.md). 
+results](https://gist.github.com/zac-williamson/838410a3da179d47d31b25b586c15e53).  
+
+## The Rationale Behind Lowering Gas Costs  


There is a standard "rationale" section in EIPs. Also it seems the layout of this EIP follows an outdated old template. Have a look at the current one: https://github.com/ethereum/EIPs/blob/master/eip-X.md

Heya, thanks for pointing that out. I've pushed a change that uses the eip-X formatting

axic · 2019-05-03T15:28:40Z

Oh, and please add adiscussions-to: field in the header. Usually authors use ethereum-magicians as a forum link. You could use https://ethereum-magicians.org/t/eip-1108-reduce-alt-bn128-precompile-gas-costs/3206 or create a new one. A github issue is also sufficient.

The formatting of the EIP has been modified to mirror EIP-X Benchmarks referenced the wrong links, these have been swapped Added example implementations of the bn128 curve Expanded rationale behind scaling gas costs relative to `ecrecover`

zac-williamson · 2019-05-04T10:34:43Z

Oh, and please add adiscussions-to: field in the header. Usually authors use ethereum-magicians as a forum link. You could use https://ethereum-magicians.org/t/eip-1108-reduce-alt-bn128-precompile-gas-costs/3206 or create a new one. A github issue is also sufficient.

Thanks for pointing that out, I've added a discussions-to field

Shadowfiend · 2019-05-06T16:21:49Z

EIPS/eip-1108.md

-EIP-196, while the gas costs for the pairing check are updates to the cost
-listed in EIP-197. Updated gas costs have been adjusted to the less performant 
-client which is Parity, according to benchmarks<sup>[3]</sup>. The updated gas costs are scaled relative to the `ecrecover` precompile.
+As no underlying algorithms are not being changed, there are no additional test cases to specify.  


“As no underlying algorithms are being* changed.”, or we're changing ALL OF THE THINGS :)

“As no underlying algorithms are being* changed.”, or we're changing ALL OF THE THINGS :)

Came here to point that language out =)

I'll push a PR that fixes it in a few.

Shadowfiend · 2019-05-07T20:12:05Z

Nitpick up there aside, anything preventing this from going in @axic? Want to help get #1988 in soon as well.

Arachnid · 2019-05-07T20:16:23Z

@Shadowfiend If you approve the PR, the bot will automatically merge it.

Shadowfiend · 2019-05-08T01:09:58Z

Yep yep; since you had a lot more notes than I did I wanted to double-check before doing that :) I'm on it!

Shadowfiend

Let's rolllllll 🚀

axic · 2019-05-22T20:52:48Z

@Shadowfiend @zac-williamson this EIP doesn't have a copyright statement. Can you please add one? EIP-1 suggests CC0 - see the eip-x.md template.

Shadowfiend · 2019-05-23T21:03:51Z

Opened #2067 to address both of the outstanding comments here @axic.

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This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Automatically merged updates to draft EIP(s) 1155 (ethereum#2085) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Automatically merged updates to draft EIP(s) 1930 (ethereum#2086) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Automatically merged updates to draft EIP(s) 778 (ethereum#2087) Hi, I'm a bot! 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This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Automatically merged updates to draft EIP(s) 778 (ethereum#2097) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Automatically merged updates to draft EIP(s) 1155 (ethereum#2101) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Automatically merged updates to draft EIP(s) 1261 (ethereum#2102) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * fix typo: "as follows" (ethereum#2099) see: https://ell.stackexchange.com/a/31673 * EIP-2003 - EVMC modules for implementations of precompiled contracts (ethereum#2003) * Automatically merged updates to draft EIP(s) 1261 (ethereum#2107) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Automatically merged updates to draft EIP(s) 1155 (ethereum#2108) Hi, I'm a bot! 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This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * ERC-1155 Final Status (ethereum#2122) * Automatically merged updates to draft EIP(s) 1344 (ethereum#2079) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Propose to move EIP-695 to last call status (ethereum#1566) * Propose to move EIP-695 to last call status * Add a discussion link * Formatting fix * Fix @sorpaas handle in author field * Use EIP155 formatting for `CHAIN_ID` * Formatting fix for "chain ID" The document had places where we use lowercase "id" and uppercase "ID". This unify them to use uppercase "ID". * Update eip-695.md * Move EIP-695 to Last Call status and add 155 requirement (ethereum#2128) * Update eip-1577.md (ethereum#1670) * Automatically merged updates to draft EIP(s) 1702 (ethereum#2130) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Automatically merged updates to draft EIP(s) 1702 (ethereum#2131) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Automatically merged updates to draft EIP(s) 695 (ethereum#2133) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Automatically merged updates to draft EIP(s) 1202 (ethereum#2134) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Automatically merged updates to draft EIP(s) 1702 (ethereum#2140) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Automatically merged updates to draft EIP(s) 1702 (ethereum#2141) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Funding ETH1.X through a Developer Block Reward for 18 Months (ethereum#2025) * Automatically merged updates to draft EIP(s) 1702 (ethereum#2149) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * EIP 747: wallet_watchAsset (ethereum#1426) * Initial draft * Add eip-747: watchToken * Update discussion link * Update eip-747 to watchAsset * Add image specification and examples EIP747 * Add asset type error * Respond to feedback * Depends on 1474 * Correct type to standards track * Correct spelling * Add eip images locally (ethereum#2150) * Automatically merged updates to draft EIP(s) 823 (ethereum#2151) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Automatically merged updates to draft EIP(s) 1193 (ethereum#2057) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * ERC-1948: Non-fungible Data Token (ethereum#1948) * first draft * remove boilerplate * fix indentations * typos * ethereum code highlights * moved file to id * syntax * naming * link to erc721 * make interface an interface * typo * better comments * Automatically merged updates to draft EIP(s) 1679, 233 (ethereum#2081) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Automatically merged updates to draft EIP(s) 1702 (ethereum#2152) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Introduced Abandoned status in EIP-1 (ethereum#2051) * Introduced Abandoned status in EIP-1 * Fix typo * EIP-1967: Standard Proxy Storage Slots (ethereum#1967) * Proxy storage slots EIP * Apply suggestions from code review Co-Authored-By: spalladino <spalladino@gmail.com> * Add reference to vyper storage slots * Fix links to EIPs Co-Authored-By: spalladino <spalladino@gmail.com> * Apply suggestions from code review Co-Authored-By: spalladino <spalladino@gmail.com> * Applied suggestions by elopio and nventuro * Add discussions-to * Add EIP number * Rename eip file * Fix type attribute * Use zOS independent hash preimage * Implement suggestion by axic * Automatically merged updates to draft EIP(s) 1474 (ethereum#2155) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Automatically merged updates to draft EIP(s) 1613 (ethereum#2163) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Automatically merged updates to draft EIP(s) 1066 (ethereum#2164) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * Mark EIP-158 proper superseded and not replaced (ethereum#2160) * Update eip_validator to 0.8.2 (ethereum#2161) * Fix Markdown formatting in EIP-1186 * Update eip_validator to 0.8.2 * Abandone EIP-1355 "Ethash 1a" (ethereum#1785) * Add information EIP: Common Prometheus metrics (ethereum#2159) * Add common metrics EIP. * Fix spelling error. * Assign EIP number, added more information on what Prometheus does. * Add link to prometheus website for further info. * Fix link. * Fix discussion link. * Switch to standards track - interface instead of informational. * Add motivation. * superseded-by EIP 1 (ethereum#2165) * Automatically merged updates to draft EIP(s) 1702 (ethereum#2167) Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * EIP-1753 - Define a smart contract interface for permits and licences (ethereum#1753) * First draft * Update eip-x.md * Update eip-x.md * Update eip-x.md * Update eip-x.md * Update eip-x.md * Update eip-x.md * Update eip-x.md * Update eip-x.md * Update authors * Update eip-x.md * Rename eip md * Rollback * Rename md * Add copyright * WIP: Re adding specificaiton * Update example solidity * Update eip-1753.md * Update eip-1753.md * Update eip-1753.md * Update eip-1753.md * Update eip-1753.md * Update eip-1753.md * Do not touch eip-X * Fix typo * EIP-1895: Improvements (ethereum#2153) * EIP-1895: Better constants and address range description Address @Arachnid's comments about presenting constants and how an address value is limited. * EIP-1985: Fix a typo * EIP-1985: Use "instructions" instead of "opcodes" * eip-225: mark as final (ethereum#1954) * set EIP875 to last call and correct errors (ethereum#1549) * Automatically merged updates to draft EIP(s) 1571 (ethereum#2168) Hi, I'm a bot! 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This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing * EIP-1901: Add OpenRPC Service Discovery To JSON-RPC Services (ethereum#1901) * EIP-????: Add OpenRPC Service Discovery To JSON-RPC Services * fix: * fix(openrpc): add openrpc.json to eip assets * fix(openrpc): reference eip asset * Update EIPS/eip-1901.md - document link * Delete openrpc.json * Update eip-1901: move link to spec to top * fix(1901): preamble + author github usernames * fix(1901): add copyright info * fix(1901): add link to eth json rpc spec * fix(1901): type and category in preamble + spelling * fix(1901): motivation section and use vendored assets * fix(1901): add link to multi-geth OpenRPC discovery * fix(1901): change ordering + small fixes * fix(1901): typo * Automatically merged updates to draft EIP(s) 1108 (ethereum#2177) Hi, I'm a bot! 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Hi, I'm a bot! This change was automatically merged because: - It only modifies existing Draft or Last Call EIP(s) - The PR was approved or written by at least one author of each modified EIP - The build is passing

zac-williamson force-pushed the master branch from 850cb3c to 119027b Compare May 3, 2019 11:29

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zac-williamson changed the title ~~updated EIP-1108~~ Update EIP-1108 with latest gas metering benchmarks May 3, 2019

zac-williamson and others added 5 commits May 3, 2019 14:39

Update EIPS/eip-1108.md

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Update EIPS/eip-1108.md

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Update EIPS/eip-1108.md

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zac-williamson force-pushed the master branch from 5df7705 to 005e3f2 Compare May 3, 2019 13:44

EIP-1108: Fixed spelling and grammar

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updated eip-1679 to contain eip-1108 #1988

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zac-williamson added 2 commits May 4, 2019 11:16

EIP-1108 - updated formatting

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The formatting of the EIP has been modified to mirror EIP-X Benchmarks referenced the wrong links, these have been swapped Added example implementations of the bn128 curve Expanded rationale behind scaling gas costs relative to `ecrecover`

added discussions-to field in header

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eip-automerger merged commit 44073f8 into ethereum:master May 8, 2019

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EIP-1108: Reduce alt bn128 gas costs #1108

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EIP-1108: Add gas cost clarification + copyright assignment #2067

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Update EIP-1108 with latest gas metering benchmarks #1987

Update EIP-1108 with latest gas metering benchmarks #1987

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		Fast elliptic curve cryptography is a keystone of a growing number of protocols built on top of Ethereum. To list a few:

		[The AZTEC protocol](https://github.com/AztecProtocol/AZTEC) utilizes the elliptic curve precompiles to construct private tokens, with zero-knowledge transaction logic, via the [ERC1723](https://github.com/ethereum/EIPs/issues/1723) and [ERC1724](https://github.com/ethereum/EIPs/issues/1724) standard.

Update EIP-1108 with latest gas metering benchmarks #1987

Update EIP-1108 with latest gas metering benchmarks #1987

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