UNIX for Advanced & Expert Users

Hi Experts,

I have this requirement to process large files (200MB+).Format of files is like:

Code:

recordstart
val1               1
val2               2
val3               4
recordstart
val1               5
val2               6
val3               1
val4               1
recordstart
val1               1 
val2               3
val3               6

Final output required is

Code:

val1,val2,val3
1,2,4
5,6,1
1,3,6

My existing AWK script does the job but its very slow.
val1, val2,val3 are repeating values and i have "recordstart" before each set of values

I would like to process these files using perl. Idea is to

1. split file into hashes by using "recordstart" as delimiter.
2. process each hash separately.
3. values in 2nd column also need some regular expression job.


I know how to read a normal file into hash. My problem here is to split file into chunks and then handle those hash by common variable.

Any hints !
Thanks in advance.