Further to this, this is the normal memory code condensed with normalization
removed to give "raw" versions of the facts.
require 'facter'
{ :MemorySizeRaw => "MemTotal",
:MemoryFreeRaw => "MemFree",
:SwapSizeRaw => "SwapTotal",
:SwapFreeRaw => "SwapFree"
}.each do |fact, name|
Facter.add(fact) do
confine :kernel => :linux
setcode do
memsize_raw = ""
Thread::exclusive do
File.readlines("/proc/meminfo").each do |l|
memsize_raw = $1.to_i if l =~ /^#{name}:\s+(\d+)\s+\S+/
# MemoryFree == memfree + cached + buffers
# (assume scales are all the same as memfree)
if name == "MemFree" &&
l =~ /^(?:Buffers|Cached):\s+(\d+)\s+\S+/
memsize_raw += $1.to_i
end
end
end
memsize_raw
end
end
end
Thanks
Chris
On 30 June 2011 13:29, Chris Phillips <[email protected]> wrote:
>
> Well that's odd, I was looking at the exact same issue this morning for
> sysctl.conf / oracle stuff.
>
> But why are people writing new facts?? Why not just take a copy of the
> original function and simply not run the function that normalizes the
> number? It seems very odd to make a more limited version of the function
> when it's already there.
>
> Is it not possible to copy the code directly from utils/memory.rb in
> facter?
>
> Chris
>
> On 30 June 2011 13:00, Martijn Grendelman <[email protected]> wrote:
>
>> On 30-06-11 11:20, Matthias Saou wrote:
>> > Andreas Kuntzagk <[email protected]> wrote:
>> >
>> >> I want some config depending on memorysize.
>> >>
>> >> What I tried was
>> >> if ($memorysize >= 256 * 1024*1024) {
>> >> ...
>> >> }
>> >>
>> >> But this fails because $memorysize is a string (and contains a "G")
>> >> and can't be compared to an int.
>> >>
>> >> Are all facts strings? How do I work with numbers?
>> >
>> > Typical problem. Not to mention that you happen to have "G" but that
>> > could very easily be "M". Here's my workaround for that, which I use
>> > for calculations to then set some sysctl.conf values accordingly :
>> >
>> > # This is ugly, but very useful to get a standard kiB total RAM
>> > # to base further calculations upon. Note that we get a string
>> > $mem = inline_template("<%
>> > mem,unit = scope.lookupvar('::memorysize').split
>> > mem = mem.to_f
>> > # Normalize mem to KiB
>> > case unit
>> > when nil: mem *= (1<<0)
>> > when 'kB': mem *= (1<<10)
>> > when 'MB': mem *= (1<<20)
>> > when 'GB': mem *= (1<<30)
>> > when 'TB': mem *= (1<<40)
>> > end
>> > %><%= mem.to_i %>")
>>
>> I use a custom fact, that returns the amount of system memory in
>> megabytes. This is, however, Linux-only, since it uses /proc/meminfo:
>>
>> $ cat modules/common/lib/facter/memorysize_mb.rb
>>
>>
>> require 'facter'
>>
>> Facter.add("memorysize_mb") do
>> confine :kernel => :Linux
>>
>> ram = 0
>>
>> # Steal linux's meminfo
>> File.open( "/proc/meminfo" , 'r' ) do |f|
>> f.grep( /^MemTotal:/ ) { |mem|
>> ram = mem.split( / +/ )[1].to_i / 1024
>> }
>> end
>>
>> setcode do
>> ram
>> end
>> end
>>
>>
>> > Here's an example of how I then use it :
>> >
>> > # kernel.shmmax
>> > if $shmmax {
>> > $shmmax_final = $shmmax
>> > } else {
>> > if $oracle {
>> > # For non-shm half the RAM for <= 4G, 2G otherwise
>> > if $mem <= 4294967296 {
>> > $shmmax_final = $mem / 2
>> > } else {
>> > $shmmax_final = $mem - 2147483648
>> > }
>> > } else {
>> > $shmmax_final = $mem
>> > }
>> > }
>>
>>
>> Best regards,
>> Martijn Grendelman
>>
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