Large Ramdisk creation causes crashes

[Brandon Ooi]

Hi Andy,

Sorry that wasn't an exact transcript. I was actually doing...

perl -e 'print 1 x 600000000' > /mnt/r0/file0

which fills the drive and then stops. This seems to work as long as the 
total number of 1's I write to ram is less than 40% of total memory I 
have (regardless of how large the ramdisks are or how many I create).

I have created 10MB and 100MB ramdisks which seem to work fine. Writing 
and rewriting work as expected (and fast!). It's only when I create more 
and larger drives do I encounter problems.

Brandon


Andy Green wrote:

>>perl -e 'print 1 x 600000000' > /mnt/r0
>>    
>>
>
>In the example given, you seem to be copying 600MB of '1's to the
>mountpoint?  (I don't know Perl).  Maybe things would go differently if
>you sent this to a file on the mountpoint... eg
>
>dd if=/dev/zero of=/mnt/r0/testfile bs=1024 count=450000
>
>  
>
>>At some point the machine seems to just freeze and crash. It responds to
>>ping but is unresponsive to ssh or other input and must be powercycled.
>>I know there is enough free memory for this. It seems to happen when I
>>fill just under half of the memory I should have allocated... Allocating
>>less (< 40%) seems to work just fine.
>>    
>>
>
>Hm I would try a single 128 Ram drive and see if I could fill it up, if
>the first idea didn't help.
>
>-Andy
>  
>