go-smtp-source is a simple drop replacement for smtp-source in Postfix distribution written in Go
I want to add some feature to smtp-source. I don't want to go with C because we have Go.
go-smtp-source does not providea all features that smtp-source provided but it has some additional feature.
- STARTTLS support
- Precious time metrics support (smtp-source does not provide elasped time. We need to use
timewith smtp-source.) - Clustering support for distributed load testing
See smtp-source(1) about original smtp-source.
go-smtp-source should be performant. I measured the performance for go-smtp-source and smtp-source against smtp-sink with sending 10000 messages.
$ ./bench.sh
Start sending 10000 messages...
Concurrency: 1
smtp-source:
6.99user 13.81system 0:30.88elapsed 67%CPU (0avgtext+0avgdata 2696maxresident)k
0inputs+0outputs (0major+128minor)pagefaults 0swaps
go-smtp-source:
4.34user 15.27system 0:18.00elapsed 108%CPU (0avgtext+0avgdata 6980maxresident)k
0inputs+0outputs (0major+335minor)pagefaults 0swaps
-------------------------
Concurrency: 100
smtp-source:
0.50user 2.07system 0:02.58elapsed 99%CPU (0avgtext+0avgdata 3164maxresident)k
0inputs+0outputs (0major+304minor)pagefaults 0swaps
go-smtp-source:
0.52user 5.51system 0:05.57elapsed 108%CPU (0avgtext+0avgdata 9820maxresident)k
0inputs+0outputs (0major+1036minor)pagefaults 0swaps
-------------------------
Concurrency: 1000
smtp-source:
0.60user 2.31system 0:02.93elapsed 99%CPU (0avgtext+0avgdata 3028maxresident)k
0inputs+0outputs (0major+216minor)pagefaults 0swaps
go-smtp-source:
0.58user 4.30system 0:04.45elapsed 109%CPU (0avgtext+0avgdata 31828maxresident)k
0inputs+0outputs (0major+7125minor)pagefaults 0swaps
-------------------------
Download from releases.
Or
go get -u github.com/nabeken/go-smtp-sourceSend 100 messages in 10 concurrency to SMTP server running on 127.0.0.1:10025 over TLS.
go-smtp-source -s 10 -m 100 -tls 127.0.0.1:10025smtp-sink(1) is a good friend for benchmarking {go-,}smtp-source.