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In an effort to reduce CPU usage and hence reduce power consumption on
laptops I noticed multipass-gui is not very idle and causing wake up
events that prevent CPUs from going into deep sleep states:
I ran health-check on the process(es) and we get the following activity
on an "idle" laptop:
CPU usage (in terms of 1 CPU):
PID Process USR% SYS% TOTAL% Duration
3448 multipass.gui 0.20 0.18 0.38 60.00 (very light load)
Page Faults:
PID Process Minor/sec Major/sec Total/sec
3448 multipass.gui 0.17 0.00 0.17
Context Switches:
PID Process Voluntary Involuntary Total
Ctxt Sw/Sec Ctxt Sw/Sec Ctxt Sw/Sec
3448 multipass.gui 51.72 0.02 51.73 (moderate)
3747 multipass.gui 14.57 0.00 14.57 (moderate)
3746 multipass.gui 14.12 0.00 14.12 (moderate)
3750 multipass.gui 4.12 0.00 4.12 (low)
3735 multipass.gui 3.95 0.00 3.95 (low)
3646 multipass.gui 1.87 0.00 1.87 (low)
3736 multipass.gui 0.00 0.00 0.00 (idle)
3689 multipass.gui 0.00 0.00 0.00 (idle)
3688 multipass.gui 0.00 0.00 0.00 (idle)
Total 90.33 0.02 90.35
File I/O operations:
No file I/O operations detected.
System calls traced:
PID Process Syscall Count Rate/Sec Total
μSecs % Call Time
3448 multipass.gui poll 250 4.1666
58811927 16.7992
3448 multipass.gui futex 194 3.2333
19837 0.0057
3448 multipass.gui read 190 3.1666
8968 0.0026
3448 multipass.gui write 183 3.0499
16374 0.0047
3448 multipass.gui stat 180 3.0000
7485 0.0021
3448 multipass.gui openat 120 2.0000
7879 0.0023
3448 multipass.gui close 120 2.0000
4386 0.0013
3448 multipass.gui access 60 1.0000
4097 0.0012
3448 multipass.gui restart_syscall 1 0.0167
108620 0.0310
3646 multipass.gui recvmsg 16 0.2667
1732 0.0005
3646 multipass.gui write 16 0.2667
1712 0.0005
3646 multipass.gui poll 16 0.2667
49636001 14.1782
3646 multipass.gui restart_syscall 1 0.0167
8082750 2.3088
3688 multipass.gui futex 1 0.0167
0 0.0000
3689 multipass.gui futex 1 0.0167
0 0.0000
3735 multipass.gui futex 78 1.3000
55985585 15.9919
3735 multipass.gui epoll_wait 6 0.1000
796 0.0002
3735 multipass.gui restart_syscall 1 0.0167
330956 0.0945
3736 multipass.gui restart_syscall 1 0.0167
0 0.0000
3746 multipass.gui recvmsg 114 1.9000
5969 0.0017
3746 multipass.gui futex 102 1.7000
57937295 16.5494
3746 multipass.gui write 90 1.5000
4118 0.0012
3746 multipass.gui epoll_wait 56 0.9333
7297 0.0021
3746 multipass.gui sendmsg 32 0.5333
3991 0.0011
3746 multipass.gui mprotect 2 0.0333
86 0.0000
3746 multipass.gui restart_syscall 1 0.0167
108987 0.0311
3747 multipass.gui recvmsg 119 1.9833
5170 0.0015
3747 multipass.gui futex 109 1.8166
57942254 16.5508
3747 multipass.gui write 90 1.5000
3325 0.0009
3747 multipass.gui epoll_wait 56 0.9333
6840 0.0020
3747 multipass.gui sendmsg 33 0.5500
3200 0.0009
3747 multipass.gui mprotect 1 0.0167
45 0.0000
3747 multipass.gui restart_syscall 1 0.0167
1110219 0.3171
3750 multipass.gui futex 82 1.3666
59918248 17.1153
3750 multipass.gui epoll_wait 6 0.1000
706 0.0002
Total 2329 38.8160
350086855
Top polling system calls:
PID Process Syscall Rate/Sec Infinite Zero
Minimum Maximum Average
Timeouts Timeouts
Timeout Timeout Timeout
3448 multipass.gui poll 4.1666 0 63
0.0 sec 1.0 sec 714.6 msec
3646 multipass.gui poll 0.2667 16 0
0.0 sec 0.0 sec 0.0 sec
3735 multipass.gui epoll_wait 0.1000 0 6
0.0 sec 0.0 sec 0.0 sec
3746 multipass.gui epoll_wait 0.9333 56 0
0.0 sec 0.0 sec 0.0 sec
3747 multipass.gui epoll_wait 0.9333 56 0
0.0 sec 0.0 sec 0.0 sec
3750 multipass.gui epoll_wait 0.1000 0 6
0.0 sec 0.0 sec 0.0 sec
Total 6.4999 128 75
Distribution of poll timeout times:
10.0 100.0 1.0
10.0 100.0 1.0 10.0 100.0
up to to to to
to to to to or more
Zero 9.9 99.9 999.9 9.9
99.9 999.9 9.9 99.9 Infinite
PID Process Syscall sec usec usec usec
msec msec msec sec sec sec Wait
3448 multipass.gui poll 63 - - - -
1 185 1 - - 0
3646 multipass.gui poll 0 - - - -
- - - - - 16
3735 multipass.gui epoll_wait 6 - - - -
- - - - - 0
3746 multipass.gui epoll_wait 0 - - - -
- - - - - 56
3747 multipass.gui epoll_wait 0 - - - -
- - - - - 56
3750 multipass.gui epoll_wait 6 - - - -
- - - - - 0
Polling system call analysis:
No bad polling discovered.
Filesystem Syncs:
None.
Inotify watches added:
None.
Memory:
Per Process Memory (K):
PID Process Type Size RSS PSS
3448 multipass.gui Stack 132 24 24
3448 multipass.gui Heap 602656 16620 16620
3448 multipass.gui Mapped 92888 34232 24546
Change in memory (K/second):
PID Process Type Size RSS PSS
3448 multipass.gui Heap 0.00 0.67 0.67 (growing)
Heap Change via brk():
None.
Memory Change via mmap() and munmap():
None.
Open Network Connections:
PID Process Proto Send Receive Address
3747 multipass.gui UNIX 2.75 K 7.87 K @/tmp/.X11-unix/X0
3746 multipass.gui UNIX 2.67 K 7.81 K @/tmp/.X11-unix/X0
3646 multipass.gui UNIX 0.00 B 672.00 B
/run/dbus/system_bus_socket
3448 multipass.gui UNIX 0.00 B 0.00 B /run/user/1000/bus
3448 multipass.gui UNIX 0.00 B 0.00 B
/run/systemd/journal/stdout
3448 multipass.gui UNIX 0.00 B 0.00 B @/tmp/.X11-unix/X0
3448 multipass.gui UNIX 0.00 B 0.00 B
/run/dbus/system_bus_socket
Total 5.43 K 16.34 K
Things to note:
1. The heap is growing, is that a long term leak?
2. There are quite a few poll events going on per second. That's a good way to
keep a CPU from going into deep C states.
** Affects: ubuntu
Importance: Undecided
Status: Invalid
--
multipass gui eats CPU cycles
https://bugs.launchpad.net/bugs/1943323
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