Hello Jens,
>That's expected - when the main thread goes to sleep, it checks for this
>status dump file. If it exists, then it'll show the current summary of
>stats, then unlink it.
Thanks for explain this point.
Just to confirm my understanding the following option with engine 'posixaio'
iodepth=128 and numjobs=128 =>
I don't use 'thread' option so i think with iodpeth=128 the main fio process will fork to create 128 process.
With numjob=128 that imply, i'll clone each forked process from fio (due to iodepth) that's imply 16384 process (128 * 128).
If i use threads enabled, with iodepth=128 the main fio process will create with pthread_create 128 threads for itself.
With numjobs=128, the ain fio process will clone to have 16384 threads into itselft or it will fork to create 128 process and each process has 128 threads.
> That's the main thread, what are the IO threads doing?
If i follow disk I/O there are no activities.
This kind of information for fio process can help or not to answer the questions?
The list of thread by process this:
# ps -mo THREAD
USER PID PPID TID ST CP PRI SC WCHAN F TT BND COMMAND
root 9437428 10551472 - A 0 60 1 - 200001 pts/0 - ksh
- - - 18350143 S 0 60 1 - 10400 - - -
padmin 10551472 11534386 - A 0 60 1 - 240001 pts/0 - -rksh
- - - 49873143 S 0 60 1 - 10400 - - -
root 11206870 9437428 - A 1 60 1 - 200001 pts/0 - bash
- - - 48759011 S 1 60 1 - 410400 - - -
root 62914724 11206870 - A 6 63 1 - 200001 pts/0 - ps -mo THREAD
- - - 116850921 R 6 63 1 - 400000 - - -
#
Or thread for a given process like this:
# ps -mp 9437428 -o THREAD
USER PID PPID TID ST CP PRI SC WCHAN F TT BND COMMAND
root 9437428 10551472 - A 0 60 1 - 200001 pts/0 - ksh
- - - 18350143 S 0 60 1 - 10400 - - -
#
I tried to use gdb against the live process but i don't how to progress with it?
I can do gdb against the executable also but i don't know how to progress whit it?
Regards,
Thierry
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