> The bad news is that except in the stats_command_string cases, HEAD
> is noticeably slower than 8.1 on the machine with slow gettimeofday.
> In the single-transaction test this might be blamed on the addition
> of statement_timestamp support (which requires a gettimeofday per
> statement that wasn't there in 8.1) ... but in the one-transaction-
> per-statement tests that doesn't hold water, because each branch is
> doing a gettimeofday per statement, just in different places.
>
> Can anyone else reproduce this slowdown? It might be only an artifact
> of these particular builds, but it's a bit too consistent in my x86 data
> to just ignore.
You don't perchance have ON_ERROR_ROLLBACK on do you? I did when I tried
testing it and ltrace shows plenty of traffic caused by that.
Even when I disable it I notice a few odd things. Aside from the rather high
number of memset calls (presumably caused by palloc0) why is anything calling
htonl at all? This is after the initial connection just executing "select 1"
over and over, no inet data types or anything like that.
2771 memset 925 __sigsetjmp 744 strcmp 739 htonl 650 strncpy 556 memcpy 464 strcpy 462 htons 372
malloc 370 free 279 memcmp 186 __errno_location 93 strtol 93 send 93 recv 93 ntohl 93 memchr 93
gettimeofday 92 strncmp 92 sprintf
--
greg
