- Timo Sirainen tss@iki.fi:
On Tue, 2010-10-26 at 11:44 +0200, Ralf Hildebrandt wrote:
I traced around a bit today, in dovecot-lda. A pattern I'm seeing quite often is this:
0.000853 open("/usr/dovecot-2/lib/dovecot/settings", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = 7 0.000463 fcntl64(7, F_GETFD) = 0x1 (flags FD_CLOEXEC) 0.000555 getdents64(7, /* 8 entries */, 32768) = 360 0.023219 getdents64(7, /* 0 entries */, 32768) = 0 0.001545 close(7) = 0two consecutive getdents64 calls on the same FD, one fast, one slow. WTF?
I don't know.. Is that directory on local filesystem?
Yes.
Are your mails on the same disk?
No!
We have: /dev/sda1 on / type ext3 (rw,errors=panic) /dev/mapper/volg1-logv1 on /home type ext4 (rw,noexec,nodev,noatime,errors=panic,data=writeback)
time(NULL) should always be a really fast operation. On my somewhat old machine it takes 0.000016 seconds. So if it's taking this long, it seems that the system in general is under heavy load and the individual system call times don't really tell anything.
Yes, but where does the heavy load come from :)
-- Ralf Hildebrandt Geschäftsbereich IT | Abteilung Netzwerk Charité - Universitätsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebrandt@charite.de | http://www.charite.de