Atop

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atop is a daemon sampling some metrics on a server such as processlist, memory, cpu usage...

atop let us browse the per 10 minutes (configurable) samples with t and T and even filter out the process list with P (then enter: php).

 atop -r /var/log/atop.log.1

Get samples from previous log file between 01:59 and 02:00

 atop -r /var/log/atop.log.1 -b 01:59 -e 02:00

Press m for memory report:

   PID  VSTEXT  VSIZE  RSIZE  VGROW  RGROW  MEM CMD
 10815   7442K   7.1G   2.6G 161.1M 179.4M  68% php

Press d for disk report:

   PID     RDDSK    WRDSK  WRDSK_CANCEL     DSK CMD
 10815    69824K     4.0G          4.0G     99% php

RDDSK : number of reads, WRDSK : number of writes.

atop 1.27 will give us the full commandline though it is not in Ubuntu Precise.