physmem: a new program to report memory information (original) (raw)

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From: Assaf Gordon
Subject: physmem: a new program to report memory information
Date: Thu, 30 Aug 2012 11:35:30 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.4) Gecko/20120510 Icedove/10.0.4

Hello,

Related to the previous sort+memory envvar usage thread: http://thread.gmane.org/gmane.comp.gnu.coreutils.general/3028/focus=3090 .

Attached is a suggestion for a tiny command-line program "physmem", that similarly to "nproc", exposes the gnulib functions "physmem_total()" and "physmem_available()".

The code is closely modeled after nproc, and the "recommended" memory usage is calculated using sort's default_sort_size() .

The program works like this:

$ ./src/physmem --help Usage: ./src/physmem [OPTION]... Prints information about physical memory.

-t, --total print the total physical memory. -a, --available print the available physical memory. -r, --recommended print a safe recommended amount of useable memory. -h, --human-readable print sizes in human readable format (e.g., 1K 234M 2G) --si like -h, but use powers of 1000 not 1024 --help display this help and exit --version output version information and exit

Report physmem bugs to address@hidden GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> Report physmem translation bugs to <http://translationproject.org/team/> For complete documentation, run: info coreutils 'physmem invocation'

The actual working code (at the bottom of physmem.c) is:

switch(memory_report_type) { case total: memory = physmem_total(); break;

case available:
  memory = physmem_available();
  break;

case recommended:
  memory = default_sort_size();
  break;
}

char buf[LONGEST_HUMAN_READABLE + 1]; fputs (human_readable (memory, buf, human_output_opts,1,1),stdout); fputs("\n", stdout);

So it's very simple, and rely on existing coreutils code.

Please let me know if this is something you'd be willing to include in coreutils.

Thanks, -gordon

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