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Andreas Kuntzagk

2011-Jun-30 07:36 UTC

[Puppet Users] using memorysize fact in manifests

Hi,

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?

regards, Andreas

-- 
Andreas Kuntzagk
SystemAdministrator
MDC Berlin / BIMSB
Tel.: +49 30 9406 2997

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Matthias Saou

2011-Jun-30 09:20 UTC

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Re: [Puppet Users] using memorysize fact in manifests

Andreas Kuntzagk <andreas.kuntzagk@mdc-berlin.de> 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 %>")

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
        }
    }

HTH,
Matthias

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Martijn Grendelman

2011-Jun-30 12:00 UTC

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Re: [Puppet Users] using memorysize fact in manifests

On 30-06-11 11:20, Matthias Saou wrote:> Andreas Kuntzagk <andreas.kuntzagk@mdc-berlin.de> 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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Chris Phillips

2011-Jun-30 12:29 UTC

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Re: [Puppet Users] using memorysize fact in manifests

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 <martijn@iphion.nl> wrote:
> On 30-06-11 11:20, Matthias Saou wrote:
> > Andreas Kuntzagk <andreas.kuntzagk@mdc-berlin.de> 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
>
> --
> You received this message because you are subscribed to the Google Groups
> "Puppet Users" group.
> To post to this group, send email to puppet-users@googlegroups.com.
> To unsubscribe from this group, send email to
> puppet-users+unsubscribe@googlegroups.com.
> For more options, visit this group at
> http://groups.google.com/group/puppet-users?hl=en.
>
>
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Chris Phillips

2011-Jun-30 12:56 UTC

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Re: [Puppet Users] using memorysize fact in manifests

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 <chris@untrepid.com> 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 <martijn@iphion.nl> wrote:
>
>> On 30-06-11 11:20, Matthias Saou wrote:
>> > Andreas Kuntzagk <andreas.kuntzagk@mdc-berlin.de> 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
>>
>> --
>> You received this message because you are subscribed to the Google
Groups
>> "Puppet Users" group.
>> To post to this group, send email to puppet-users@googlegroups.com.
>> To unsubscribe from this group, send email to
>> puppet-users+unsubscribe@googlegroups.com.
>> For more options, visit this group at
>> http://groups.google.com/group/puppet-users?hl=en.
>>
>>
>
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