named

[Scott van Looy]

Hoping this might help someone debug my issue…

I attached a strace:
strace -f -p 1747 -o trace.txt

Left it running for around 10 seconds and got 34Mb of log that's all pretty much this:

1751  epoll_wait(9,  <unfinished ...>
1750  futex(0x7f8148e22028, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
1749  futex(0x7f8148e22028, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
1748  futex(0x7f8148e2108c, FUTEX_WAIT_PRIVATE, 4692676, NULL <unfinished ...>
1747  rt_sigsuspend([] <unfinished ...>
1750  <... futex resumed> )             = 0
1749  <... futex resumed> )             = -1 EAGAIN (Resource temporarily unavailable)
1748  <... futex resumed> )             = -1 EAGAIN (Resource temporarily unavailable)
1750  futex(0x7f8148e22078, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
1749  futex(0x7f8148e22078, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
1748  futex(0x7f8148e2108c, FUTEX_WAIT_PRIVATE, 4692677, NULL <unfinished ...>
1750  <... futex resumed> )             = 0
1749  <... futex resumed> )             = -1 EAGAIN (Resource temporarily unavailable)
1750  futex(0x7f8148e2207c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 15836521, {1333549881, 89699000}, ffffffff <unfinished ...>
1749  futex(0x7f8148e2207c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x7f8148e22078, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1} <unfinished ...>
1750  <... futex resumed> )             = -1 EAGAIN (Resource temporarily unavailable)
1749  <... futex resumed> )             = 0
1750  futex(0x7f8148e22028, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
1749  futex(0x7f8148e22028, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
1750  <... futex resumed> )             = 0
1749  <... futex resumed> )             = 0
1750  futex(0x7f8148e22078, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
1749  futex(0x7f8148e22078, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
1750  <... futex resumed> )             = 0
1749  <... futex resumed> )             = -1 EAGAIN (Resource temporarily unavailable)
1750  futex(0x7f8148e2207c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 15836523, {1333549881, 89699000}, ffffffff <unfinished ...>
1749  futex(0x7f8148e2207c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x7f8148e22078, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1} <unfinished ...>
1750  <... futex resumed> )             = -1 EAGAIN (Resource temporarily unavailable)
1749  <... futex resumed> )             = 0
1750  futex(0x7f8148e2108c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x7f8148e21088, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1} <unfinished ...>
1749  futex(0x7f8148e2108c, FUTEX_WAIT_PRIVATE, 4692678, NULL <unfinished ...>
1750  <... futex resumed> )             = 1
1749  <... futex resumed> )             = -1 EAGAIN (Resource temporarily unavailable)
1748  <... futex resumed> )             = 0
1750  futex(0x7f8148e21028, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
1749  futex(0x7f8148e2108c, FUTEX_WAIT_PRIVATE, 4692679, NULL <unfinished ...>
1748  futex(0x7f8148e21028, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
1750  <... futex resumed> )             = 0
1748  <... futex resumed> )             = -1 EAGAIN (Resource temporarily unavailable)
1750  futex(0x7f8148e22028, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
trace.txt

On 4 Apr 2012, at 11:54, Scott van Looy <scott at ethosuk.net> wrote:

> I have a bit of an odd issue, in that when I start named, it sits using around 95% of CPU.
> I've changed nothing lately that I'm aware of, and the logs don't seem to show anything odd happening.
> 
> Does anyone have any pointers on debugging this?
> -- 
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