Re: Perfomance tuning for NIS client

["joseph blase" <joseph.mailboxlist@xxxxxxxxx>]

On 10/13/07, Garrick Staples <garrick@xxxxxxx> wrote:

> On Sat, Oct 13, 2007 at 03:45:14AM +0800, joseph blase alleged:
> > [root@amsdc2-n-s04taw root]# time id userid
> > uid=36923(userid) gid=36923(u_036923) groups=36923(u_036923)
> >
> > real    0m10.509s
> > user    0m0.030s
> > sys     0m0.090s

 

 

 

 

> Start with 'strace id userid' to see where it is stalling.  Maybe you'll find a
> bad PTR lookup or something.

 

Thanks, seems strace show something use but can't parse it.

 

[root@linux]# strace -c -e trace=network -T id userid

uid=36923(userid) gid=36923(u_036923) groups=36923(u_036923)
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 26.19    0.879992           86     10184        72 bind
 23.81    0.800000      200000         4           connect
 17.26    0.579985          57     10112           recvfrom
 12.50    0.419998          42     10112           sendto
 12.20    0.409995          41     10112           setsockopt
  8.04    0.269990          27     10116           socket
------ ----------- ----------- --------- --------- ----------------
100.00    3.359960                 50640        72 total
[root@linux]# strace -c  -T id userid
uid=36923(myjtaf) gid=36923(u_036923) groups=36923(u_036923)
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 28.37    5.659654         560     10112           poll
  4.36    0.869994          85     10184        72 bind
  4.21    0.839992          83     10114           readv
  4.06    0.809998          80     10131         7 open
  4.06    0.809974          80     10112           setsockopt
  4.01    0.800000       200000         4           mprotect
  4.01    0.800000      200000         4           brk
  4.01    0.800000      200000         4           writev
  4.01    0.800000      200000         4           connect
  3.91    0.779980          77     10112           sendto
  3.51    0.700000      700000         1           write
  3.51    0.700000       33333        21           mmap
  3.51    0.700000      700000         1           getpid
  3.51    0.700000      700000         1           arch_prctl
  3.01    0.600000       33333        18           read
  3.01    0.600000       75000         8           munmap
  2.76    0.549979          54     10116           fcntl
  2.66    0.529992          52     10112           ioctl
  2.21    0.439998          44     10112           recvfrom
  2.01    0.400000      200000         2           lseek
  2.01    0.400000      200000         2           uname
  1.40    0.279993          28     10116           socket
  1.40    0.279977          14     20240           close
  0.50    0.100000        7692        13           fstat
------ ----------- ----------- --------- --------- ----------------
100.00   19.949531                121544        79 total
 

It seem that bind to something takes too much time.

 

> You can also determine if the stall is in NIS code with 'ypmatch userid
> passwd'.

 

 

Normal here.

> If nscd is running, does killing it make a difference?

 

It worsen it.

 

 

> Any selinux violations in /var/log/messages?

 

 

None, as no selinux enabled.

 

 

with trace=bind output, please shed light what's happening in this?

 

[root@linux root]# strace  -e trace=bind -T id userid
bind(5, {sa_family=AF_INET, sin_port=htons(682), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(683), sin_addr=inet_addr(" 0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(684), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(685), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(686), sin_addr=inet_addr(" 0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(687), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(688), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(689), sin_addr=inet_addr(" 0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(690), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(691), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>

<<< ---------------Very Long same messages------------------------------------------>>

bind(5, {sa_family=AF_INET, sin_port=htons(672), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(673), sin_addr=inet_addr(" 0.0.0.0")}, 16) = -1 EADDRINUSE (Address already in use) <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(674), sin_addr=inet_addr("0.0.0.0 ")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(675), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(676), sin_addr=inet_addr(" 0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(677), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(678), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(679), sin_addr=inet_addr(" 0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(680), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(681), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(682), sin_addr=inet_addr(" 0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(683), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(684), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(685), sin_addr=inet_addr(" 0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(686), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(687), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(688), sin_addr=inet_addr(" 0.0.0.0")}, 16) = 0 <0.000000>
bind(5, {sa_family=AF_INET, sin_port=htons(689), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 <0.000000>
uid=36923(userid) gid=36923(u_036923) groups=36923(u_036923)

Joseph
 

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