ok, then try the following command:

FILE=/path/to/file
watch -n 1 'date >> $FILE ; cat /proc/loadavg >> $FILE;free -m >>$FILE; vmstat >>$FILE; ps -eo pcpu,pmem,vsz,tty,time,stat,pid,user,args --sort -pcpu,-pmem >>$FILE; sync;sync;'

or if you have a ssh session:

watch -n 1 'date ; cat /proc/loadavg;free -m; vmstat ; ps -eo pcpu,pmem,vsz,tty,time,stat,pid,user,args --sort -pcpu,-pmem '


note the sync;sync is to make sure that the log is actually written to the disk this might lower the performance as it will be call regularly.