More ps_handle class methods

[gaborcsardi]

• nice() (get + set)
• ionice()
• rlimit()
• io_counters()
• num_ctx_switches()
• num_fds()
• num_handles()
• threads()
• cpu_percent()
• cpu_affinity()
• cpu_num()
• memory_full_info()
• memory_percent()
• memory_maps()
• open_files()
• connections()
• wait()

[mike-lawrence]

+1 for set_cpu_affinity! Just needs taskset on Linux, but dunno about other OSs

[gaborcsardi]

Calling external commands is not great in R, and small Docker containers might not have taskset. But there is an easy API for this on Linux: https://linux.die.net/man/2/sched_getaffinity

There is also API for it on Windows: https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-getprocessaffinitymask

It seems impossible on macOS, though.

[brianmsm]

I was just looking for the memory_full_info function. I understand it's still in the process of implementation, right?

[gaborcsardi]

@brianmsm Well, these are things I might implement in the future, or things I am happy to get help with.

What do you need from memory_full_info()? There is ps_memory_info() with some basic information:

❯ ps::ps_memory_info()
         rss          vms      pfaults      pageins
    81592320 419098476544         5515           42

[brianmsm]

Well, following the psutil documentation in python, the memory_full_info() function allows access to uss (Unique Set Size), pss (Proportional Set Size) and swap information. In my case I am very interested in getting the swap memory information used in a particular process.

[gaborcsardi]

@brianmsm Happening here: #122, Linux seems to be working well.

[brianmsm]

Great! Thank you very much, I'll be waiting for you to join the main branch :D

[gaborcsardi]

CPU affinity happening here, FYI: #123