[Info-vax] HIBertanting DECthreads process accrues CPU time.
VAXman- at SendSpamHere.ORG
VAXman- at SendSpamHere.ORG
Thu Feb 10 12:47:19 EST 2011
In article <00AAAC90.D13DDCBF at SendSpamHere.ORG>, VAXman- @SendSpamHere.ORG writes:
>I have a process with three threads. These three threads are created
>and then, sit on $HIBER until awakened when there is work to do.
>
>Occasionally, I will see this process (when started) accruing CPU time
>when there is nothing in terms of work for it to do. I've put various
>markers in the code and *these* threads are not active. I've used SDA
>and I've viewed the TEBs. Stack highwater is well below each thread's
>stack limit.
>...
>Does anybody have a clue as to what DECthreads is doing here?
>
>I am convinced there something horked in the thread scheduler. Sadly,
>I cannot use pthread_getcputime_np() on the several internal (negative
>sequence number threads) which DECthreads has created to see which of
>them is actually accruing this time. I do know that it's not MY three
>threads chewing up this time.
Here's some more info from SDA. Note threads -2 and -4 are "running"
and are clocking up all the CPU time. No idea why. All of the other
threads (and I took the time to name my threads) are going nothing at
all.
SDA> PTHREAD THREAD -af
main thread 1 (blocked, kernel) "MY THREAD 1" (0x000000007B744D90), created by
pthread
Waiting in $HIBER
No stack trace available
Scheduling: home RAD 0, current RAD 0, SCHED_OTHER policy at priority 11
q_num: 0, average cpu time: 0.03, average sched interval: 60.25, last run
--------------------------------^^^^
stamp: 354414.460, last ready stamp: 354414.460, last adj stamp:
354414.460, cpu time: 0.062594320
PKTA 0x00000000, VP critical history 0x00000000; next block sequence num
10720, reference count is 2, static_ctx: (sp: 0x78EF3590, fp_control:
0x0000000000000000, persona: 0000000000000001, asten: 0000000000000001);
Last dispatched from T2, to T-2; governed by global lock
ASTs are enabled
10720 kernel blocking calls, 16 pagefaults: 0x0000000000118000,
0x0000000000112000, 0x000000000010A000, >0x0000000000056000,
0x00000000000CC000, 0x000000000011C000
Alloc flags: teb-not-stack, def-stack, foreign-stack, separate-tsd, tis-tsd;
Self flags: no-resched; Debug flags: activated
Thread specific data: 0=0x000000007B7453E4
Stack: SP 0x0000000078EF3590, base is 0x0000000078EF8000 (size: 955219968
bytes), guard area at 0x0000000040000000 (size: 0 bytes)
General cancelability enabled, asynch cancelability disabled
The thread's start function and argument are 0x001813A0 (0x0000000078EF3B80)
The thread's latest errno is 0
thread 2 (blocked, kernel) "MY THREAD 2" (0x000000000025B280), created by
pthread
Waiting in $HIBER
No stack trace available
Scheduling: home RAD 0, current RAD 0, SCHED_OTHER policy at priority 8
q_num: 31, average cpu time: 0.00, average sched interval: 67.52, last run
---------------------------------^^^^
stamp: 354417.460, last ready stamp: 354417.460, last adj stamp:
354417.460, cpu time: 0.060174894
PKTA 0x00000000, VP critical history 0x00000000; next block sequence num
10716, reference count is 1, static_ctx: (sp: 0x00259810, fp_control:
0x0000000000000000, persona: 0000000000000001, asten: 0000000000000001);
Last dispatched from T-4, to T-4; governed by global lock
ASTs are enabled
10716 kernel blocking calls
Self flags: no-resched; Sched flags: detached, report-preemption
Thread specific data: 0=0x000000000025B8D4
Stack: SP 0x0000000000259810, base is 0x000000000025A000 (size: 32768 bytes),
yellow zone at 0x0000000000252000 (size: 8192 bytes), guard area at
0x0000000000250000 (size: 8192 bytes)
Detached
General cancelability enabled, asynch cancelability disabled
The thread's start function and argument are 0x00180AE0 (0x0000000000000000)
The thread's handle was stored at 0x000E01E0.
The thread's latest errno is 0
thread 3 (blocked, kernel) "MY THREAD 3" (0x000000000027D280), created by
pthread
Waiting in $HIBER
No stack trace available
Scheduling: home RAD 0, current RAD 0, SCHED_OTHER policy at priority 8
q_num: 31, average cpu time: 0.00, average sched interval: 73.23, last run
---------------------------------^^^^
stamp: 354420.460, last ready stamp: 354420.460, last adj stamp:
354420.460, cpu time: 0.073178289
PKTA 0x00000000, VP critical history 0x00000000; next block sequence num
10718, reference count is 1, static_ctx: (sp: 0x0027B810, fp_control:
0x0000000000000000, persona: 0000000000000001, asten: 0000000000000001);
Last dispatched from T-4, to T-4; governed by global lock
ASTs are enabled
10718 kernel blocking calls
Self flags: no-resched; Sched flags: detached, report-preemption
Thread specific data: 0=0x000000000027D8D4
Stack: SP 0x000000000027B810, base is 0x000000000027C000 (size: 32768 bytes),
yellow zone at 0x0000000000274000 (size: 8192 bytes), guard area at
0x0000000000272000 (size: 8192 bytes)
Detached
General cancelability enabled, asynch cancelability disabled
The thread's start function and argument are 0x00180B30 (0x0000000000000000)
The thread's handle was stored at 0x000E00F0.
The thread's latest errno is 0
manager thread -1 (blocked) "manager thread" (0x00000000001D9280), created by
pthread
Blocked on indeterminate object
No stack trace available
Scheduling: home RAD 0, current RAD 0, SCHED_FIFO policy at priority 34
q_num: 32, average cpu time: 0.00, average sched interval: 42603.66, last
run stamp: 354415.460, last ready stamp: 351448.460, cpu time: 0.138105628
PKTA 0x00000000, VP critical history 0x00000001; next block sequence num
10790, reference count is 2, static_ctx: (sp: 0x001D7830, fp_control:
0x0000000000000000, persona: 0000000000000001, asten: 0000000000000001);
Last dispatched from T-2, to T3; governed by global lock
ASTs are enabled
Object flags: daemon; Self flags: no-resched, no-async-sigs; Sched flags:
run-til-block, prio-preempt, fixed-prio, report-preemption
Thread specific data: 0=0x00000000001D98D4
Stack: SP 0x00000000001D7830, base is 0x00000000001D8000 (size: 49152 bytes),
yellow zone at 0x00000000001CC000 (size: 8192 bytes), guard area at
0x00000000001CA000 (size: 8192 bytes)
General cancelability enabled, asynch cancelability disabled
The thread's start function and argument are 0x7B76A670 (0x0000000000000000)
The thread's handle was stored at 0x7B758110.
The thread's latest errno is 0
----------------vvvvvvv------------------------------------------------------
null thread -2 (running) "null thread for VP 2" (0x00000000001FD280), created
----------------^^^^^^^------------------------------------------------------
by pthread
Scheduling: home RAD 0, current RAD 0, null thread policy at priority -1
q_num: -1, average cpu time: 99.97, average sched interval: 11985.29, last
---------------------------------^^^^^
run stamp: 354416.460, last ready stamp: 353968.460, cpu time >=
5.000713713, V2, on kid 0x0000000021800645.
PKTA 0x7FFEFF98, VP critical set, history 0x00000001; reference count is 2,
static_ctx: (sp: 0x00000000, fp_control: 0x0000000000000000, persona:
0000000000000001, asten: 0000000000000001); Last dispatched from T1, to
T-1; governed by VP 2
ASTs are enabled
Object flags: daemon; Self flags: no-async-sigs; Sched flags: run-til-block,
fixed-prio
Thread specific data: 0=0x00000000001FD8D4
Stack: SP unavailable, base is 0x00000000001FC000 (size: 49152 bytes), yellow
zone at 0x00000000001F0000 (size: 8192 bytes), guard area at
0x00000000001EE000 (size: 8192 bytes)
General cancelability enabled, asynch cancelability disabled
The thread's start function and argument are 0x7B76A6A0 (0x00000000001FD980)
The thread's handle was stored at 0x78EF7AA0.
The thread's latest errno is 0
exit handler thread -3 (blocked) "exit-handling thread" (0x0000000000221280),
created by pthread
Blocked on indeterminate object
No stack trace available
Scheduling: home RAD 0, current RAD 0, SCHED_FIFO policy at priority 32
q_num: 32, average cpu time: 0.00, average sched interval: 0.01, last run
stamp: 343704.450, last ready stamp: 343704.450, cpu time: 0.000054426
PKTA 0x00000000, VP critical history 0x00000000; next block sequence num 1,
reference count is 2, static_ctx: (sp: 0x0021F850, fp_control:
0x0000000000000000, persona: 0000000000000001, asten: 0000000000000001);
Last dispatched from T1, to T1; governed by global lock
ASTs are enabled
Object flags: daemon; Self flags: no-resched; Sched flags: run-til-block,
prio-preempt, fixed-prio, report-preemption
Thread specific data: 0=0x00000000002218D4
Stack: SP 0x000000000021F850, base is 0x0000000000220000 (size: 49152 bytes),
yellow zone at 0x0000000000214000 (size: 8192 bytes), guard area at
0x0000000000212000 (size: 8192 bytes)
General cancelability enabled, asynch cancelability disabled
The thread's start function and argument are 0x7B76B868 (0x0000000000000000)
The thread's handle was stored at 0x7B758188.
The thread's latest errno is 0
----------------vvvvvvv------------------------------------------------------
null thread -4 (running) "null thread for VP 3" (0x000000000026D280), created
----------------^^^^^^^------------------------------------------------------
by pthread
Scheduling: home RAD 0, current RAD 0, null thread policy at priority -1
q_num: -1, average cpu time: 99.97, average sched interval: 47546.57, last
---------------------------------^^^^^
run stamp: 354418.460, last ready stamp: 353249.460, cpu time >=
0.432673002, V3, on kid 0x0000000021800A45.
PKTA 0x40029F98, VP critical set, history 0x00000001; reference count is 2,
static_ctx: (sp: 0x00000000, fp_control: 0x0000000000000000, persona:
0000000000000001, asten: 0000000000000001); Last dispatched from T3, to T3;
governed by VP 3
ASTs are enabled
Object flags: daemon; Self flags: no-async-sigs; Sched flags: run-til-block,
fixed-prio
Thread specific data: 0=0x000000000026D8D4
Stack: SP unavailable, base is 0x000000000026C000 (size: 40960 bytes), yellow
zone at 0x0000000000262000 (size: 8192 bytes), guard area at
0x0000000000260000 (size: 8192 bytes)
General cancelability enabled, asynch cancelability disabled
The thread's start function and argument are 0x7B76A6A0 (0x000000000026D980)
The thread's handle was stored at 0x78EF35C0.
The thread's latest errno is 0
--
VAXman- A Bored Certified VMS Kernel Mode Hacker VAXman(at)TMESIS(dot)ORG
All your spirit rack abuses, come to haunt you back by day.
All your Byzantine excuses, given time, given you away.
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