Date: Wed, 13 Apr 2005 15:53:45 +0800 From: David Xu <davidxu@freebsd.org> To: Scott Long <scottl@samsco.org> Cc: Jiawei Ye <leafy7382@gmail.com> Subject: Re: How does one know how many thread a process owns? Message-ID: <425CD009.6040208@freebsd.org> In-Reply-To: <425CC7F8.3030803@samsco.org> References: <c21e92e20504122232f568545@mail.gmail.com> <425CC7F8.3030803@samsco.org>
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Scott Long wrote: > Jiawei Ye wrote: > >>> From top in pkgsrc, one can know that a certain process has some >> >> number of LWP in it. >> load averages: 1.89, 1.72, 1.68; up >> 119+05:28:10 13:30:48 >> 154 processes: 152 sleeping, 1 running, 1 on cpu >> CPU states: % idle, % user, % kernel, % iowait, % >> swap >> Memory: 1024M real, 414M free, 841M swap in use, 1956M swap free >> >> PID USERNAME LWP PRI NICE SIZE RES STATE TIME CPU COMMAND >> 21891 bond 1 4 2 19M 1864K run 31.7H 77.04% >> upd_twd_15min >> 17153 bond 1 50 2 82M 6164K sleep 37:37 12.98% >> dataserver.tsk >> 17151 bond 1 53 2 82M 81M sleep 41:57 0.96% >> dataserver.tsk >> 13742 otc 1 53 2 30M 21M sleep 3:31 0.89% >> dataserver.tsk >> 17204 mtrs 1 53 2 82M 6144K sleep 2:47 0.67% >> dataserver.tsk >> 17321 mtrs 1 53 2 25M 7908K sleep 2:21 0.49% otcmgr.tsk >> 16250 root 1 59 0 4136K 2224K sleep 0:00 0.47% sshd >> 13745 otc 1 53 2 30M 2496K sleep 2:55 0.36% >> dataserver.tsk >> 3821 jessica 1 59 0 31M 4816K sleep 6:25 0.34% >> dataserver.tsk >> 17227 bond 1 53 2 25M 7908K sleep 2:46 0.31% otcmgr.tsk >> 17553 otc 1 53 2 17M 1208K sleep 0:46 0.18% >> icbc_pricing >> 16269 leafy 1 45 0 3360K 1688K sleep 0:00 0.13% bash >> 17202 mtrs 1 53 2 82M 19M sleep 1:08 0.12% >> dataserver.tsk >> 17154 bond 1 53 2 82M 8004K sleep 0:35 0.12% >> dataserver.tsk >> 13746 otc 1 53 2 30M 5136K sleep 0:37 0.11% >> dataserver.tsk >> >> In our top, show threads does not tell you how many threads exactly >> exists in a process, is there any way to imitate the other top's >> behaviour? >> >> Jiawei > > > With KSE threads (the default libpthread.so library), the kernel doesn't > know about all of the process-scope threads that are alive it only > knows about the ones that are running currently or are blocked within > the kernel. These are not the same as LWP, since they are scheduled in > userland and thus are somewhat invisible to the kernel. There are > various ways to set libpthread to create only process-scope threads that > look a little more like LWP, or you can switch to the libthr.so library > that exclusively creates 1:1 threads that are always visible to the > kernel. > > Scott I believe he wants to see total threads number in a process. add a column to top to display total kernel threads in per-process, p_numthreads in proc structure is what you need . :) David Xu
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