** Changed in: unity
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1242229
Title:
unity-panel-service uses 3% to 5% of one CPU core all the time
Status in Unity:
Confirmed
Status in “unity” package in Ubuntu:
Confirmed
Bug description:
unity-panel-service sits at between 3% and 5% of one core, all the
time. That's up to 50 MIPS! What's it doing?
Only standard indicators used, and most Unity lenses and scopes not
installed. Internet access is available and unfiltered. Standard Intel
Mobile 4 GPU.
When I set the datetime indicator to show seconds, unity-panel-service
uses an additional 1% of CPU. That's 10 million instructions each time
the clock ticks!
Sample strace output (most of it looks like this, repeated over and
over again, once per second):
futex(0x7fad2800f2b0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7fad2800eac0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7fad28004110, FUTEX_WAKE_PRIVATE, 1) = 1
recvfrom(3, 0x25896f4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}],
3, 481) = 1 ([{fd=4, revents=POLLIN}])
write(7, "\1\0\0\0\0\0\0\0", 8) = 8
futex(0x7fad2800f2b0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7fad2800eac0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7fad28004110, FUTEX_WAKE_PRIVATE, 1) = 1
recvfrom(3, 0x25896f4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}],
3, 478) = 1 ([{fd=4, revents=POLLIN}])
read(4, "\1\0\0\0\0\0\0\0", 16) = 8
recvfrom(3, 0x25896f4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}],
3, 478) = 0 (Timeout)
read(4, 0x7fff81ade700, 16) = -1 EAGAIN (Resource temporarily
unavailable)
recvfrom(3, 0x25896f4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}],
3, 962) = 1 ([{fd=4, revents=POLLIN}])
recvfrom(3, 0x25896f4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}],
3, 80) = 1 ([{fd=4, revents=POLLIN}])
read(4, "\1\0\0\0\0\0\0\0", 16) = 8
recvfrom(3, 0x25896f4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}],
3, 80) = 0 (Timeout)
read(4, 0x7fff81ade700, 16) = -1 EAGAIN (Resource temporarily
unavailable)
write(7, "\1\0\0\0\0\0\0\0", 8) = 8
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