Hi all,
I have recently started using LTTng and stumbled upon the fact, that
LTTng is keeping a lot of open file pointers to a single deleted file.
Specifically the process that holds these open is the lttng-consumerd and its
threads. The file that is held open, but is deleted is
/dev/shm/ust-shm-consumer-${PID} with the PID of the lttng-comsumerd. The
number of open file descriptors is dependent on the number of CPUs the
system has and results to 16 + (#CPUs * 16). Is this behavior expected?
# lsof | grep lttng | grep DEL
lttng-con 2280 root DEL REG 0,18
11128
/dev/shm/ust-shm-consumer-2280
lttng-con 2280 root DEL REG 0,18
11127
/dev/shm/ust-shm-consumer-2280
lttng-con 2280 root DEL REG 0,18
11126
/dev/shm/ust-shm-consumer-2280
[...]
I have tested this on a Xen-Dom0 system running SLES 12 SP5 and on a
SLES12 SP5 without Xen.
Best regards,
Nils Döring
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