Steady writes to SSD, dtrace/rwbypid.d not working on 10.8 ?

Discussion in 'OS X Mountain Lion (10.8)' started by paulCC, Jun 19, 2013.

  1. paulCC, Jun 19, 2013
    Last edited: Jun 19, 2013

    paulCC macrumors member

    Joined:
    Nov 2, 2012
    #1
    Hello:
    I was lucky enough to be able to switch to a new SSD - the Crucial M500/960GB, this on an 2011 15 Early Macbook Pro.

    As this is my first SSD, it looked up all the needed tweaks for SSD, implemented the ones that makes sense ( TRIM, SmartSleep, no access time flag, etc... )

    In the process I noticed that there is a steady stream of write I/O to the SSD. After some 30 hours, Activity monitor shows 15GB read, and 32GB written. That seems to be strange.

    I used iotop to see some of the writes - but this gives a snapshot, while I'd like a summary after some longer period of time. For this, Google says uses rwbypid.d or bitesize.d.

    The problem is that these do not seem to work. When I terminate them via CTRL-C, they just exit, but do not print any collected stats. Am I wrong in expecting them to print the stats on exit ?

    In addition - are there any other tools to get per/process disk I/O statistics ?

    Thanks for any info. Paul.
     
  2. crjackson2134 macrumors 68020

    crjackson2134

    Joined:
    Mar 6, 2013
    Location:
    Charlotte, NC
    #2
    Not sure about some parts of your question, but have you checked to make site TimeMachine is turns OFF?

    Also, if this is a new drive, it could be indexing.
     

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