Re: Re: Slow sessions.

Bostjan, Thanks again for the tip. At this point, it looks like there is an issue with my main file server. It's weird that the older servers were working with it fine though (by instantly failing on lock), so I originally thought it might be a php issue. I think I'm making progress on it now though. -- Rob On 3/28/2011 12:08 PM, Rob Adams wrote:

On 3/26/2011 11:07 AM, Bostjan Skufca wrote:

Can you strace it's execution and see where your delay is comming from? If you are using apache, make it create just one child and strace that one when you generate a request.

Thanks for the advice. I installed strace on the new server, and it has a thirty second delay on the flock call (opening the session file): open("/path/to/session/sess_SESSIONID", O_RDWR|O_CREAT, 0600) = 20 flock(20, LOCK_EX) = -1 ENOLCK (No locks available) fcntl64(20, F_SETFD, FD_CLOEXEC) = 0 fstat64(20, {st_mode=S_IFREG|0644, st_size=13, ...}) = 0 pread64(20, "cpixUser|b:1;", 13, 0) = 13 gettimeofday({1301331125, 622954}, NULL) = 0 gettimeofday({1301331125, 623046}, NULL) = 0 brk(0x989d000) = 0x989d000 gettimeofday({1301331125, 623301}, NULL) = 0 pwrite64(20, "cpixUser|b:1;", 13, 0) = 13 close(20) = 0 This has the correct session file name (ie "/path/to/session/sess_SESSIONID"). So then I installed strace on one of the older servers, to see what it was doing, and this is what I see where it is opening the session file: open("\"M\235\240GU\21", O_RDWR|O_CREAT, 0600) = 9 flock(9, LOCK_EX) = -1 EOPNOTSUPP (Operation not supported) fcntl(9, F_SETFD, FD_CLOEXEC) = 0 fstat(9, {st_mode=S_IFCHR|040, st_rdev=makedev(113, 1114152), ...}) = 0 lseek(9, 0, SEEK_SET) = 0 read(9, "cpixUser|b:1;"..., 13) = 13 gettimeofday({540876916, 1078020164}, {3221773391, 671636288}) = 0 sigprocmask(SIG_BLOCK, NULL, []) = 0 lseek(9, 0, SEEK_SET) = 0 write(9, "cpixUser|b:1;"..., 13) = 13 close(9) = 0 I don't know why it has the session file as this: "\"M\235\240GU\21". So it looks like the flock(?) is taking 30 seconds to timeout on the new server, and failing instantly on the old ones. On the new server, I have a message in /var/log/messages that reads: Mar 28 10:38:34 webServer kernel: lockd: server mainFileServer not responding, timed out I get this message evertime I call session_start(). I have tried reloading the new server from scratch (CentOS 5.5, php 5.2.17, apache 2.2) and it is still doing the same thing.