command for (2)
[roel@R420 618951]$ cat 9d /sde/Percona-Server-5.6.13-rc60.5-450-debug.Linux.x86_64/bin/mysqld --basedir=/sde/Percona-Server-5.6.13-rc60.5-450-debug.Linux.x86_64 --datadir=/tmp --port=39799 --pid=/ssd/1380539109/pid.pid --log-error=/ssd/1380539109/error.log.out --socket=/ssd/1380539109/socket.sock --user=roel --innodb-buffer-pool-populate --core 2>&1
/tmp is not a datadir, it's just a dummy option for datadir. Note also that strace above may have been on dummy datadir also (but it matters little).
command for (2)
[roel@R420 618951]$ cat 9d Server- 5.6.13- rc60.5- 450-debug. Linux.x86_ 64/bin/ mysqld --basedir= /sde/Percona- Server- 5.6.13- rc60.5- 450-debug. Linux.x86_ 64 --datadir=/tmp --port=39799 --pid=/ ssd/1380539109/ pid.pid --log-error= /ssd/1380539109 /error. log.out --socket= /ssd/1380539109 /socket. sock --user=roel --innodb- buffer- pool-populate --core 2>&1
/sde/Percona-
/tmp is not a datadir, it's just a dummy option for datadir. Note also that strace above may have been on dummy datadir also (but it matters little).