Hi Mike,
thanks a lot for !!! yes, ustack show getpwuid() when ps shown slowness. it turned out to the non-existence of nscd which was disabled due to coredumping. Thanks, James Yang Global Unix Support, IES, GTO Deutsche Bank US Phone: 201-593-1360 Email : [EMAIL PROTECTED] Pager : 1-800-946-4646 PIN# 6105618 CR: NYC_UNIX_ES_US_UNIX_SUPPORT http://dcsupport.ies.gto.intranet.db.com/ "Mike Gerdts" <[EMAIL PROTECTED] > To Jianhua Yang/db/[EMAIL PROTECTED] 11/12/08 10:40 PM cc dtrace-discuss@opensolaris.org Subject Re: [dtrace-discuss] ps slowness in local zones On Wed, Nov 12, 2008 at 9:30 PM, Jianhua Yang <[EMAIL PROTECTED]> wrote: > Hello, > > ps -ef cmd in local zones takes about 15 ~ 20 seconds randomly, but work > perfect on the global zone. truss shows the time was spent on pollsys > syscall (went to sleeping) after putmsg. This is almost always slowness waiting for a name service (e.g. NIS or LDAP). My guess is that if you go into a directory with files owned by a lot of different people (try /tmp or /var/tmp) and do "ls -l" you will see similar slowness. Also "ps -o uid -e" should be fast and "ps -o user -e" will be slow. > the most of syscalls made by function traced by dtrace: ioctl(), gtime(), > read() and write(), which were issued by application processes that are all > single-threaded, but it seems that the syscalls are not related to pollsys > sleeping, as the ps slowness happened during the time when ioctl() call > reached over 50000 and over 5000. there are over 40 GB freemem, cpu is > always 80% idle; and shortlived processes took about 07 ~ 1.8 sec out of 5 > sec, could the those shortlived caused the slowness ? Add ustack() to the data you are collecting. I bet that you will find that there are getpwuid() calls in the stack traces during the pauses. -- Mike Gerdts http://mgerdts.blogspot.com/ --- This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying, disclosure or distribution of the material in this e-mail is strictly forbidden.
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