.:: debugging ::.
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# print syscalls of process with all threads (-f) of running process
strace -f -p <pid>
# only trace certain syscalls
strace -f -p <pid> -e trace=open,socket
# trace signals delivered to process
strace -f -p <pid> -e signal

# dump stack of process and all threads
pstack <pid>

# print file flags
# +fg    print file flag abbreviations
lsof +fg -p <pid>

# print process virt mem map
# compared to /proc/<>/maps it shows the size of the mappings
pmap <pid>


# get supported events
perf list

perf stat -p <pid>
perf stat -p <pid> -I <ms>
perf stat -p <pid> -e cycles,faults,cache-misses,context-switches

# -K    hide kernel threads
perf top -F 99 -p <pid> -K

perf record -F 99 -p <pid>
perf record -F 99 -p <pid> --call-graph dwarf
perf record -F 99 -p <pid> -e instructions,cpu-cycles,faults,cache-misses,context-switches


# print supported events
ophelp

operf -p <pid>

opreport -c
opreport -l

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