[tahoe-dev] clarification on time stats for Immutable files and mutable files ?

[sreenivasulu velpula]

When an upload happens on Tahoe grid for an immutable file,  It will give
time statistics, i didn't understand some of those timings.

Please correct me if any of my assumptions are wrong.

*Example:*


   - Timings:
      - File Size: 235 bytes
      - Total: 118 seconds (2Bps)
         - Storage Index: 1.2ms (192.3kBps)
         *( I assume this is the time for hashing encryption key and
         generating storage index)*


   - [Contacting Helper]:
            - [Helper Already-In-Grid Check]:
         - [Upload Ciphertext To Helper]: ()


   - Peer Selection: 81 seconds

                               *(I didn't understand what is peer selection,
can any one explain it ?)*

   - Encode And Push: 37 seconds (7.6kBps)

                                 * (I assume this is the time to take
splitting the file into segmentsm erasure coding of segments and then send
erasure coded blocks to servers)*

   - Cumulative Encoding: 7.4ms (31.6kBps)

                                                * (I didn't understand what
is Cumulative Encoding, can any one explain it ?)*

   - Cumulative Pushing: 24ms (10.0kBps)

                                                  * (I didn't understand
what is Cumulative Pushing, can any one explain it ?)*

   - Send Hashes And Close: 36 seconds

                                                     * (Is it the time
required to send Merkle hash trees to storage servers)*

   - [Helper Total]:




-> But when we upload file as Mutable,  time stats  are not getting
displayed, Is there any way to generate these time stats on Mutable file
also  ?

-> Are there any utilities available from Tahoe to know, how much time it
will take to generate key,  time required to generate cipher text with the
key, time required to do erasure coding and  time required to send erasure
coded blocks to storage servers ?


-- 
*Regards*
Sreenivasulu.V
MTech(CS) 2nd Year
IIT Madras
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://tahoe-lafs.org/pipermail/tahoe-dev/attachments/20110209/4af56786/attachment.html>