p-memo

A pinocchio-based Memo program.

• Program ID (Memo v4): Memo4c2pN8afCj432Lb7RMVKi9PbQnnW7ewFFaV3oAH

Overview

p-memo is a reimplementation of the SPL Memo program using pinocchio. The program uses at most ~4% of the compute units used by the current Memo program when signers are present; even when there are no signers, it needs only ~14% of the current Memo program compute units. This efficiency is achieved by a combination of:

1. pinocchio "lazy" entrypoint
2. sol_log_pubkey syscall to log pubkey values
3. solana-program-log to format the memo message

Since it uses the syscall to log pubkeys, the output of the program is slightly different while loging the same information:

1: Program Memo4c2pN8afCj432Lb7RMVKi9PbQnnW7ewFFaV3oAH invoke [1]
2: Program log: Signed by:
3: Program log: 1111111QLbz7JHiBTspS962RLKV8GndWFwiEaqKM
4: Program log: Memo (len 60):
5: Program log: why does spl memo use 36000 cus to print len 60 msg of ascii
6: Program Memo4c2pN8afCj432Lb7RMVKi9PbQnnW7ewFFaV3oAH consumed 537 of 1400000 compute units
7: Program Memo4c2pN8afCj432Lb7RMVKi9PbQnnW7ewFFaV3oAH success

Logging begins with entry into the program (line 1). Then there is a separate log to start the signers section (line 2); this is only present if there are signer accounts. After that there will be one line for each signer account (line 3), followed by the memo length and UTF-8 text (line 4-5). The program ends with the status of the instruction (lines 6-7).

Performance

CU comsumption:

[!NOTE] Using platform tools v1.54.

Building

To build the program from its directory:

cargo build-sbf --tools-version v1.54

Testing

To run the tests (after building the program):

SBF_OUT_DIR=../target/deploy cargo test

License

The code is licensed under the Apache License Version 2.0