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0 Replies Latest reply: Aug 24, 2011 7:31 AM by gleng RSS

How to get details on swapped out processes?

gleng Expert
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I am trying to get the details on some swapped out processes. Currently vmstat is showing 71 processes a swapped out:

vmstat 3 3
kthr      memory            page            disk          faults      cpu
r b w   swap  free  re  mf pi po fr de sr vc vc vc --   in   sy   cs us sy id
*0 0 6 5598448 512968 155 352 428 40 42 0 22 3 28 1 0 1982 3904 1905 7 14 79*
*0 0 71 5091488 436568 0 4 0 0 0 0 0 0 1 0 0 976 1215 945 0 3 97*
*0 0 71 5099088 440896 2 5 0 0 0 0 0 0 2 0 0 1004 1221 991 1 2 97*

A search of the MOS knowledge base turned up Support Recommended doc 1009494.1 How to use DTrace and mdb to Interpret vmstat Statistics.

The section titled "kthr: Swapped out Threads (w)" includes the following statements and commands:


To see the kernel threads swapped out during the sample period:
$ dtrace -q -n 'fbt::swapout_lwp:entry{ proc = (proc *)arg[0]->t_procp; printf("Lwp: %d of \t Proc: %s being swaped out\n",arg[0]->t_id, proc->p_user.u_comm);}'

The vmstat output doesn't tell what processes are swapped out. Mdb(1) can be used to print swapped out processes:
# echo "::walk thread myvar|::print kthread_t t_schedflag|::grep .==0x8|::eval <myvar=K|::print kthread_t t_procp|::print proc_t p_user.u_comm"|mdb -k


The dtrace command does not pass edit:
*dtrace -q -n 'fbt::swapout_lwp:entry{ proc = (proc *)arg[0]->t_procp; printf("Lwp: %d of \t Proc: %s being swaped out\n",arg[0]->t_id, proc->p_user.u_comm);}'*
*dtrace: invalid probe specifier fbt::swapout_lwp:entry{ proc = (proc *)arg[0]->t_procp; printf("Lwp: %d of \t Proc: %s being swaped out\n",arg[0]->t_id, proc->p_user.u_comm);}: syntax error near ")"*

The mdb command does not return any thing:
*#echo "::walk thread myvar|::print kthread_t t_schedflag|::grep .==0x8|::eval <myvar=K|::print kthread_t t_procp|::print proc_t p_user.u_comm"|mdb -k*
*#*


The server is running:

uname -a
SunOS rizzotest 5.10 Generic_142900-11 sun4v sparc SUNW,SPARC-Enterprise-T5220
cat /etc/release
Solaris 10 10/09 s10s_u8wos_08a SPARC
Copyright 2009 Sun Microsystems, Inc. All Rights Reserved.
Use is subject to license terms.
Assembled 16 September 2009

Thanks,
GlenG

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