Genproofs slow to close & slow in general

[adiabat]

When we ctrl-break from genproofs, it can take more than 60 seconds.

saveBridgeNodeData() calls WriteForestToDisk() in some cases, and WriteMiscData() which calls close() - those are the main candidates for taking a lot of time. But it should be able to stop within > 10 sec even on a slow computer.

Also genproofs is just too slow in general ... slower than it feels like it should be. Something to check out.

[adiabat]

utreexo/bridgenode/rev.go

Lines 180 to 195 in 92d6ee4

	for i := uint32(0); i < offsetsRead; i++ {
	blockBuf := bytes.NewBuffer(blockData[offsets[i]:])
	// skip 8 bytes, magic bytes + load size.
	blockBuf.Read(skip)
	// TODO this is probably expensive. fix
	err = blocks[i].Deserialize(blockBuf)
	if err != nil {
	return
	}
	revBuf := bytes.NewBuffer(revData[revOffsets[i]:])
	err = revs[i].Deserialize(revBuf)
	if err != nil {
	return
	}
	}

this may be a bottleneck; this part can be made into it's own goroutine / worker, and there can be multiple workers deserializing after it's pulled from disk