Running large block size simulation

Running large block size simulation

This simulation is for testing large (>1 mb) block sizes. By default btcd nodes accept a block of maximum size 999000B. We need to use a fork a btcwire with updated MaxBlockPayload to handle larger blocks:

https://github.com/tuxcanfly/btcwire/tree/maxblocksize

There are two ways to do this:

cd $GOPATH/src/github.com/conformal/btcwire/

... directly edit msgblock.go line 24:

-const MaxBlockPayload = 1000000 // Not actually 1MB which would be 1024 * 1024
+const MaxBlockPayload = 32 * 1000000 // Not actually 1MB which would be 1024 * 1024

... or if you prefer, use this branch:

cd $GOPATH/src/github.com/conformal/btcwire

git remote add tuxcanfly https://github.com/tuxcanfly/btcwire

git fetch tuxcanfly

git checkout maxblocksize

You'll need to re-install dependents of btcwire again, so you can do this:

go install -v all

To test, check that btcd accepts the updated param max for -blockmaxsize:

btcd --simnet -u rpcuser -P rpcpass --blockmaxsize=31999000

If it starts btcd, you're good to go, but if you see this message, you're missing the updated maximum block size:

loadConfig: The blockmaxsize option must be in between 1000 and 999000 -- parsed [31999000]
Use btcd -h to show usage

The default CSV is meant for simulating normal block sizes. For large block sizes, download this file and save it to a CSV: http://sprunge.us/ZTIi

Now you should be able to launch btcsim with the new maximum block size and use the new CSV for input:

btcsim -maxblocksize=31999000 -txcurve=/home/tuxcanfly/Downloads/large.csv