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                                            Andrew Toth

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validation: fetch block inputs on parallel threads 10% faster IBD

I benchmarked the latest branch with default dbcache up to 912683. Results are a speedup of 14% - 5:07 vs 5:49. | Command | Mean [s] | Min [s] |...

validation: fetch block inputs on parallel threads 10% faster IBD

Did the same benchmark with 5000 dbcache and there is a 6% speedup :rocket: - 4:27 vs 4:44. Even with far fewer cache misses this change is still a benefit,...

validation: fetch block inputs on parallel threads 10% faster IBD

Updated the input fetcher significantly: - uses counting_semaphores to synchronize threads instead of mutex + condvar. - stores tx + vin indexes in global vector instead of copying the COutPoints....

validation: fetch block inputs on parallel threads 10% faster IBD

Removed `m_batch_size`. Each thread now increments the atomic counter by 1.

validation: fetch block inputs on parallel threads 10% faster IBD

> I noticed that for small dbcache it has a very noticeable effect, but for very high dbcache this seems to add an extra cost - since we already have...

validation: fetch block inputs on parallel threads 10% faster IBD

Rebased due to conflicts. Removed the first commit. We don't need to modify `EmplaceCoinInternalDANGER`, we can just insert the coins as dirty into the cache. They will be set dirty...