On Mon, Mar 26, 2012 at 7:28 PM, Jim Klimov <jimkli...@cos.ru> wrote: > 2012-03-26 14:27, Aubrey Li wrote: >> >> The php temporary folder is set to /tmp, which is tmpfs. >> > > By the way, how much RAM does the box have available? > "tmpfs" in Solaris is backed by "virtual memory". > It is like a RAM disk, although maybe slower than ramdisk > FS as seen in livecd, as long as there is enough free > RAM, but then tmpfs can get swapped out to disk. > > If your installation followed the default wizard, your > swap (or part of it) could be in rpool/swap and backed > by ZFS - leading to both many tmpfs accesses and many > ZFS accesses. (No idea about the mutex spinning part > though - if it is normal or not). > > Also I'm not sure if tmpfs gets the benefits of caching, > and ZFS ARC cache can consume lots of RAM and thus push > tmpfs out to swap. > > As a random guess, try pointing PHP tmp directory to > /var/tmp (backed by zfs) and see if any behaviors change? > > Good luck, > //Jim >
Thanks for your suggestions. Actually the default PHP tmp directory was /var/tmp, and I changed "/var/tmp" to "/tmp". This reduced zfs root lock contention significantly. However, I still see a bunch of lock contention. So I'm here ask for help. Thanks, -Aubrey _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
