Hi, V3 protocol seems to be slower than V2 if we don't use prepared statement together. I measured performance of protocols on 8.3beta using pgbench -S with modification to use PQsendQueryParams and PQsendQueryPrepared instead of PQsendQuery. (I'll send the patch to -patches shortly.)
[V2] PQsendQuery (V2; original) [V3] PQsendQueryParams (V3) [V3P] PQsendQueryPrepared (V3 with prepared statements) V3 was 12% slower than V2, and V3P was 40% faster than V2. There seems to be some inefficient behaviors in the handling of V3 protocol or in libpq. Are there any TODO items here? ---- pg_ctl start -o "-c shared_buffers=1GB" ./pgbench -n -S -s50 -c16 -t100000 -M [V2|V3|PREPARE] transaction type: SELECT only scaling factor: 50 number of clients: 16 number of transactions per client: 100000 number of transactions actually processed: 1600000/1600000 sql mode: V2 tps = 19025.932203 (including connections establishing) tps = 19036.285885 (excluding connections establishing) sql mode: V3 tps = 16699.173521 (including connections establishing) tps = 16707.135700 (excluding connections establishing) sql mode: PREPARE tps = 26629.710398 (including connections establishing) tps = 26649.901658 (excluding connections establishing) Regards, --- ITAGAKI Takahiro NTT Open Source Software Center ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend