dtrace discuss - Feb 2008 - dtrace to show which lwp''s are waiting

In the vmstat output under the ''kthr'' colums I can see a good
number of swapped out LWP''s (the ''w'') column. Is
there a Dtrace tool (or other tool) that will show me which LWP''s are
swapped?

Jesse


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On Tue, Feb 26, 2008 at 11:51:07AM -0800, Jesse Carroll
wrote:
> In the vmstat output under the ''kthr'' colums I can see a
good number of swapped out LWP''s (the ''w'') column. Is
there a Dtrace tool (or other tool) that will show me which LWP''s are
swapped?
http://przemol.blogspot.com/2007/10/sunsolve-deeper-look-into-vmstat.html

Regards
przemol

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Wojna wampirow trwa - po ktorej jestes stronie?
Zagraj >>> http://link.interia.pl/f1cf4

Excellent, especially the referenced document
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-62-213108-1.


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Oh, and I forgot the details.  The mdb command used:

 mdb -k <<EOF
::walk thread myvar|::print kthread_t t_schedflag|::grep .==0|::eval
<myvar=K|::
print kthread_t t_procp->p_user.u_comm
EOF

What I found was that the threads where swapped out due to a memory shortfall
and they where sleeping. Once swapped out they will not "un-swap"
unless they go to running. The number displayed by the mdb output matched the
''w'' column from vmstat.


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