Prevent copying of in/outputs for SignSignature #13202
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Instead of copying data from a CMutableTransaction into a CTransaction, the data is temporarily moved and then moved back after it's use. This speeds up the slowest unit test transaction_tests/test_big_witness_transaction. 24.351 sec for all unit tests before 21.187 sec for all unit tests after this change The change is somewhat ugly since a const_cast is necessary.
martinus
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I believe this is illegal C++. You cannot modify const variables unless you know other non-const references to those variables exist as well. That isn't the case for A better way to speed things up would be to create a |
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That sounds much better than the ugly cast, I'll have a look at that |
laanwj
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May 31, 2018
6b8b63a Generic TransactionSignatureCreator works with both CTransaction and CMutableTransaction (Martin Ankerl) Pull request description: Refactored `TransactionSignatureCreator` into a templated `GenericTransactionSignatureCreator` that works with both `CMutableTransaction` and `CTransaction`. The advantage is that now in `SignSignature`, the `MutableTransactionSignatureCreator` can now operate directly with the `CMutableTransaction` without the need to copy the data into a `CTransaction`. Running all unit tests brings a very noticable speedup on my machine: 48.4 sec before this change 36.4 sec with this change -------- 12.0 seconds saved running only `--run_test=transaction_tests/test_big_witness_transaction`: 16.7 sec before this change 5.9 sec with this change -------- 10.8 seconds saved This relates to my first attempt with the const_cast hack #13202, and to the slow unit test issue #10026. Also see #13050 which modifies the tests but not the production code (like this PR) to get a speedup. Tree-SHA512: 2cff0e9699f484f26120a40e431a24c8bc8f9e780fd89cb0ecf20c5be3eab6c43f9c359cde244abd9f3620d06c7c354e3b9dd3da41fa2ca1ac1e09386fea25fb
UdjinM6
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Jun 28, 2021
…nSignature 6b8b63a Generic TransactionSignatureCreator works with both CTransaction and CMutableTransaction (Martin Ankerl) Pull request description: Refactored `TransactionSignatureCreator` into a templated `GenericTransactionSignatureCreator` that works with both `CMutableTransaction` and `CTransaction`. The advantage is that now in `SignSignature`, the `MutableTransactionSignatureCreator` can now operate directly with the `CMutableTransaction` without the need to copy the data into a `CTransaction`. Running all unit tests brings a very noticable speedup on my machine: 48.4 sec before this change 36.4 sec with this change -------- 12.0 seconds saved running only `--run_test=transaction_tests/test_big_witness_transaction`: 16.7 sec before this change 5.9 sec with this change -------- 10.8 seconds saved This relates to my first attempt with the const_cast hack bitcoin#13202, and to the slow unit test issue bitcoin#10026. Also see bitcoin#13050 which modifies the tests but not the production code (like this PR) to get a speedup. Tree-SHA512: 2cff0e9699f484f26120a40e431a24c8bc8f9e780fd89cb0ecf20c5be3eab6c43f9c359cde244abd9f3620d06c7c354e3b9dd3da41fa2ca1ac1e09386fea25fb
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Instead of copying data from a
CMutableTransactioninto aCTransaction,the data is temporarily moved and then moved back after it's use. This speeds up
the slowest unit test
transaction_tests/test_big_witness_transaction:24.351 sec for all unit tests before
21.187 sec for all unit tests after this change
The change is somewhat ugly since a
const_castis necessary.Relates to #10026. It should also speed up any use of
SignSignature, especially for machines where allocating memory is slow.