LLC monitoring core limiation

[pfilipko1]

Running such command provides results:

# LD_LIBRARY_PATH=./lib ./pqos/pqos -m llc:[0-1248]

while any higher core number fails:

# LD_LIBRARY_PATH=./lib ./pqos/pqos -m llc:[0-1249]
NOTE:  Mixed use of MSR and kernel interfaces to manage
       CAT or CMT & MBM may lead to unexpected behavior.
Error parsing "<null>" command line argument. Too many groups selected.

It prevents the user from collecting full LLC usage in multisocket platforms with more than 1248 logical cores.
cc: @rdementi

[rkanagar]

Hi @pfilipko1,
Yes, it does not work. Thanks for reporting this issue This will be fixed in next release. This is caused by below macro definition in https://github.com/intel/intel-cmt-cat/blob/master/pqos/monitor.c
#define PARSE_MON_GRP_BUFF_SIZE 1250