Get system memory information from julia

Question

Is there a nice way to get the current system information in julia (my use case here is memory but also interested in basically anything information that I could get from running top on linux).

This is what I have at the moment: (basically just getting the output of `free -m`)<- I can't get this to let me escape backticks and keep code highlighting...

import Base.DataFmt: readdlm_string, invalid_dlm

"""
    getmeminfo()
Returns (in MB) A tuple of containing:
    - Memory(total, used, buffer, available)
    - Swap(total, used, free)
"""
function getmeminfo()
    memstats = readdlm_string(readstring(`free -m`),invalid_dlm(Char), Int, '\n', true, Dict())
    return Tuple{Array{Int,1},Array{Int,1}}((memstats[2,[2;3;6;7]], memstats[3,[2;3;4]]))
end

Is there something in Base or any better ideas?

Citrine

On Linux (maybe Mac) you can also look at cat /proc/meminfo (free is also Unix specific) – Pruritus

ahh yeah, readdlm("/proc/meminfo") is much more succinct... – Citrine

Answer 1

The built-in Sys module contains functions dedicated to retrieving system information.

julia> VERSION
v"1.0.0"

julia> Sys.total_memory() / 2^20
8071.77734375

julia> Sys.free_memory() / 2^20
5437.46484375

julia> Sys.CPU_NAME
"haswell"

julia> Sys.
ARCH              KERNEL             WORD_SIZE          eval               isexecutable       set_process_title
BINDIR            MACHINE            __init__           free_memory        islinux            total_memory
CPU_NAME          SC_CLK_TCK         _cpu_summary       get_process_title  isunix             uptime
CPU_THREADS       STDLIB             _show_cpuinfo      include            iswindows          which
CPUinfo           UV_cpu_info_t      cpu_info           isapple            loadavg            windows_version
JIT               WINDOWS_VISTA_VER  cpu_summary        isbsd              maxrss
julia> # Above after pressing Tab key twice

While it does not support all of the information provided by top, it will hopefully provide the information you are looking for.

Loan

thought there had to be something like this! – Citrine

Note: those commands return the amount of memory in bytes, so dividing by 2^20 gives you the available memory in MB. – Sociopath