Hi,
One of our threaded process is consuming CPU constantly. It is seen that it is
calling the time,lwp_park and lwp_unpark continuously.
The logic of the code is explained below
Thread A Thread B,C,D,E,...(10 threads)
acquire mutex
queue is empty
cond_wait
acquire mutex
add item N
release mutex
cond_broadcast
queue is not empty
pop item N from queue
release mutex
process item N
acquire mutex
queue is empty
cond_wait
#$ truss -cf -p 14957
^C
syscall seconds calls errors
read .015 131
write .127 646
open .198 153
close .052 309
link .012 41 41
time 1.189 35525
stat .028 164
lseek .012 205
getpid .001 20
utime .000 1
access .041 334 318
kill .001 19
shmget .001 18 18
lwp_park 1.620 35045
lwp_unpark 1.146 35045
waitid .003 19
rename .208 123
fork1 2.090 16
yield .028 466
lwp_suspend .012 208
lwp_continue .009 221
lwp_sigmask .000 17
pollsys .348 1463
nanosleep .002 11
so_socket .019 96
so_socketpair .016 48
recv .066 579
-------- ------ ----
sys totals: 7.258 110923 377
usr time: 1.079
elapsed: 21.700
You have new mail in /var/mail/nmsadm
#$ pstack 14957
----------------- lwp# 1 / thread# 1 --------------------
fde49c40 nanosleep (ffbf97b8, ffbf97b0)
0003dcc0 main (c0708, 0, c06c0, 0, 1800, 326ff8) + 2930
0002e2c8 _start (0, 0, 0, 0, 0, 0) + 108
----------------- lwp# 2 / thread# 2 --------------------
fde49d04 __time (fd47bf8c, 0, 0, 1800, c1c28, fde402a0) + 8
0004fbb0 __MyProcess_0_ (9, bec98, 1800, 9, 9, 1a5c) + 100
fde46d4c _lwp_start (0, 0, 0, 0, 0, 0)
----------------- lwp# 3 / thread# 3 --------------------
fde46e18 __lwp_unpark (c1c28, 0, fdec3800, 0, fd4c0a00, c06f4) + 10
0004fd00 __MyProcess_0_ (9, bec98, 1800, 9, 9, 1a5c) + 250
fde46d4c _lwp_start (0, 0, 0, 0, 0, 0)
----------------- lwp# 4 / thread# 4 --------------------
fde46dec lwp_park (0, 0, 0)
0004fb34 __MyProcess_0_ (9, bec98, 1800, 9, 9, fd27bf5c) + 84
fde46d4c _lwp_start (0, 0, 0, 0, 0, 0)
----------------- lwp# 5 / thread# 5 --------------------
fde46e18 __lwp_unpark (c1c28, 0, fdec3800, 0, fd4c1a00, c06f4) + 10
0004fd00 __MyProcess_0_ (9, bec98, 1800, 9, 9, 1a5c) + 250
fde46d4c _lwp_start (0, 0, 0, 0, 0, 0)
----------------- lwp# 6 / thread# 6 --------------------
fde46dec lwp_park (0, 0, 0)
0004fb34 __MyProcess_0_ (9, bec98, 1800, 9, 9, fd07bf5c) + 84
fde46d4c _lwp_start (0, 0, 0, 0, 0, 0)
----------------- lwp# 7 / thread# 7 --------------------
fde46dec lwp_park (0, 0, 0)
0004fb34 __MyProcess_0_ (9, bec98, 1800, 9, 9, fcf7bf5c) + 84
fde46d4c _lwp_start (0, 0, 0, 0, 0, 0)
----------------- lwp# 8 / thread# 8 --------------------
fde46dec lwp_park (0, 0, 0)
0004fb34 __MyProcess_0_ (9, bec98, 1800, 9, 9, fce7bf5c) + 84
fde46d4c _lwp_start (0, 0, 0, 0, 0, 0)
----------------- lwp# 9 / thread# 9 --------------------
fde46dec lwp_park (0, 0, 0)
0004fb34 __MyProcess_0_ (9, bec98, 1800, 9, 9, fcd7bf5c) + 84
fde46d4c _lwp_start (0, 0, 0, 0, 0, 0)
----------------- lwp# 10 / thread# 10 --------------------
fde46e18 __lwp_unpark (c1c28, 0, fdec3800, 0, fd4c4200, c06f4) + 10
0004fd00 __MyProcess_0_ (9, bec98, 1800, 9, 9, 1a5c) + 250
fde46d4c _lwp_start (0, 0, 0, 0, 0, 0)
----------------- lwp# 11 / thread# 11 --------------------
fde46dec lwp_park (0, 0, 0)
0004fb34 __MyProcess_0_ (9, bec98, 1800, 9, 9, fcb7bf5c) + 84
fde46d4c _lwp_start (0, 0, 0, 0, 0, 0)
--
This message posted from opensolaris.org
_______________________________________________
opensolaris-discuss mailing list
[email protected]
