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Bug 738469 - Running a timer produces high CPU usage
Running a timer produces high CPU usage
Status: RESOLVED DUPLICATE of bug 710332
Product: gnome-clocks
Classification: Applications
Component: general
3.14.x
Other Linux
: Normal major
: ---
Assigned To: Clocks maintainer(s)
Clocks maintainer(s)
Depends on:
Blocks:
 
 
Reported: 2014-10-13 16:35 UTC by Michael Biebl
Modified: 2015-11-10 22:34 UTC
See Also:
GNOME target: ---
GNOME version: ---


Description Michael Biebl 2014-10-13 16:35:37 UTC 
Version: 3.14.0

When running a timer in gnome-clocks, I get unreasonably high CPU usage:
27285 root      20   0  207168  38104  22648 S  21,0  0,5   6:20.38 Xorg                                                               
19368 michael   20   0  500796  31256  24292 S  19,6  0,4   0:07.65 gnome-clocks                                                       
27581 michael   20   0 1897900 337332  58860 S  12,3  4,2   9:33.73 gnome-shell   

This is on a X220 Lenovo thinkpad with a rather powerful Core i7.

Stracing gnome-clocks reveals that it is polling in a tight loop.
Comment 1 Michael Biebl 2014-10-13 16:36:49 UTC 
recvmsg(8, {msg_name(0)=NULL, msg_iov(1)=[{"A\0\207{\350+\302\1\3\0\202\0\255\0\300\1\0\360\17\0\0\0\0\0\0\0\0\0\0\0\0\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(8, {msg_name(0)=NULL, msg_iov(1)=[{"A\0\216{\352+\302\1\3\0\202\0\255\0\300\1\0\364\17\0\0\0\0\0\0\0\0\0\0\0\0\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(8, 0x7fff8c640200, 0)           = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=13, events=POLLIN}, {fd=5, events=POLLIN}, {fd=8, events=POLLIN}, {fd=3, events=POLLIN}], 4, 0) = 0 (Timeout)
recvmsg(8, 0x7fff8c6400d0, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c640200, 0)           = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=13, events=POLLIN}, {fd=5, events=POLLIN}, {fd=8, events=POLLIN}, {fd=3, events=POLLIN}], 4, 4294967295) = 1 ([{fd=8, revents=POLLIN}])
recvmsg(8, {msg_name(0)=NULL, msg_iov(1)=[{"\241 \227{\n\0\300\1\200\1\0\0\356I\0\0\0\0\0\0\3622\0\0)A\0\0\320\7\0\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(8, 0x7fff8c640220, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c6400d0, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c640200, 0)           = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=13, events=POLLIN}, {fd=5, events=POLLIN}, {fd=8, events=POLLIN}, {fd=3, events=POLLIN}], 4, 4294967295) = 1 ([{fd=8, revents=POLLIN}])
recvmsg(8, {msg_name(0)=NULL, msg_iov(1)=[{"\241 \227{\n\0\300\1\177\1\0\0\360I\0\0\0\0\0\0\v(\341\207\3\0\0\0\0\0\0\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(8, 0x7fff8c640220, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c6400d0, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c640200, 0)           = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=13, events=POLLIN}, {fd=5, events=POLLIN}, {fd=8, events=POLLIN}, {fd=3, events=POLLIN}], 4, 0) = 0 (Timeout)
recvmsg(8, 0x7fff8c63c690, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c63c690, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c63c690, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c63c690, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c63c690, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c63c690, 0)           = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=8, events=POLLIN|POLLOUT}], 1, 4294967295) = 1 ([{fd=8, revents=POLLOUT}])
writev(8, [{"\206\3\4\0\r\0\300\1\0\0\0\0\361I\0\0005 \4\0\354+\302\1\n\0\300\1\f\1\231\0"..., 1336}, {NULL, 0}, {"", 0}], 3) = 1336
recvmsg(8, 0x7fff8c640200, 0)           = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=13, events=POLLIN}, {fd=5, events=POLLIN}, {fd=8, events=POLLIN}, {fd=3, events=POLLIN}], 4, 4294967295) = 1 ([{fd=8, revents=POLLIN}])
recvmsg(8, {msg_name(0)=NULL, msg_iov(1)=[{"A\0\242{\357+\302\1\3\0\202\0\255\0\300\1\0\370\17\0\0\0\0\0\0\0\0\0\0\0\0\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(8, {msg_name(0)=NULL, msg_iov(1)=[{"A\0\251{\361+\302\1\3\0\202\0\255\0\300\1\0\350\17\0\0\0\0\0\0\0\0\0\0\0\0\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(8, 0x7fff8c640220, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c6400d0, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c640200, 0)           = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=13, events=POLLIN}, {fd=5, events=POLLIN}, {fd=8, events=POLLIN}, {fd=3, events=POLLIN}], 4, 4294967295) = 1 ([{fd=8, revents=POLLIN}])
recvmsg(8, {msg_name(0)=NULL, msg_iov(1)=[{"A\0\262{\363+\302\1\3\0\202\0\255\0\300\1\0\360\17\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 64
recvmsg(8, 0x7fff8c640220, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c6400d0, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c640200, 0)           = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=13, events=POLLIN}, {fd=5, events=POLLIN}, {fd=8, events=POLLIN}, {fd=3, events=POLLIN}], 4, 4294967295) = 1 ([{fd=8, revents=POLLIN}])
recvmsg(8, {msg_name(0)=NULL, msg_iov(1)=[{"A\0\302{\367+\302\1\3\0\202\0\255\0\300\1\0\340\17\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 64
recvmsg(8, 0x7fff8c640220, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c6400d0, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c640200, 0)           = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=13, events=POLLIN}, {fd=5, events=POLLIN}, {fd=8, events=POLLIN}, {fd=3, events=POLLIN}], 4, 4294967295) = 1 ([{fd=8, revents=POLLIN}])
recvmsg(8, {msg_name(0)=NULL, msg_iov(1)=[{"\241 \322{\n\0\300\1\200\1\0\0\360I\0\0\0\0\0\0\2342\0\0)A\0\0\320\7\0\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(8, 0x7fff8c640220, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c6400d0, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c640200, 0)           = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=13, events=POLLIN}, {fd=5, events=POLLIN}, {fd=8, events=POLLIN}, {fd=3, events=POLLIN}], 4, 4294967295) = 1 ([{fd=8, revents=POLLIN}])
recvmsg(8, {msg_name(0)=NULL, msg_iov(1)=[{"\241 \322{\n\0\300\1\177\1\0\0\362I\0\0\0\0\0\0\360h\341\207\3\0\0\0\0\0\0\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(8, 0x7fff8c640220, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c6400d0, 0)           = -1 EAGAIN (Resource temporarily unavailable)
recvmsg(8, 0x7fff8c640200, 0)           = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=13, events=POLLIN}, {fd=5, events=POLLIN}, {fd=8, events=POLLIN}, {fd=3, events=POLLIN}], 4, 0) = 0 (Timeout)
....
Comment 2 Alexandre Franke 2015-11-04 14:09:39 UTC 
Is this still relevant? I'm running a timer here with GNOME Clocks 3.16 on an old Thinkpad T400, and htop doesn't show a high load. 1% peaks at times, that doesn't seem unreasonable.
Comment 3 Alexandre Franke 2015-11-04 15:18:01 UTC 

*** This bug has been marked as a duplicate of bug 710332 ***
Comment 4 Michael Biebl 2015-11-10 22:34:01 UTC 
Still ha(In reply to Alexandre Franke from comment #2)
> Is this still relevant? I'm running a timer here with GNOME Clocks 3.16 on
> an old Thinkpad T400, and htop doesn't show a high load. 1% peaks at times,
> that doesn't seem unreasonable.

Still happens with 3.18, CPU usage is at 20% when running a timer on a X220 laptop which has a rather fast Core 7