[Monotone-devel] Descriptors do make a difference 8-O

[Christof Petig]

See yourself: (full log at the bottom)
with:
        User time (seconds): 165.31
        System time (seconds): 3.89
        Percent of CPU this job got: 85%
        Elapsed (wall clock) time (h:mm:ss or m:ss): 3:18.74
        Major (requiring I/O) page faults: 137
        Minor (reclaiming a frame) page faults: 530354
without:
        User time (seconds): 165.80
        System time (seconds): 4.07
        Percent of CPU this job got: 75%
        Elapsed (wall clock) time (h:mm:ss or m:ss): 3:46.33
        Major (requiring I/O) page faults: 2008
        Minor (reclaiming a frame) page faults: 566454

So the difference is mostly not in processing time but in memory usage.
And descriptors are the prerequisite to using BLOBs (second stage).

All tests pass with the current candidate
463b4f748c4ab4ee9b3a8f1a37ccab1ea84e63cc.

I have a question though:
Is
  func((some_string+"something").c_str())
guaranteed to work with every compiler. If I read the standard correctly
it should. Do you consider using a variable instead of a temporary
better style?

If you feel confident about this revision (I did not check _every_ line
of the merge ...) I propose to put it into mainline (so that the trees
do not diverge again and future BLOB patches are much less intrusive).

   Christof

PS: Nathaniel: How would you tag a column to contain BLOBs in a way that
makes schema migration possible?

-----------------------------------------------------------------
monotone.sqlite3$ /usr/bin/time -v ./testsuite 177
## -------------------------------------------- ##
## monotone 0.18 test suite: integration tests. ##
## -------------------------------------------- ##
177: netsync largish file                         ok

## ------------- ##
## Test results. ##
## ------------- ##

1 test was successful.
        Command being timed: "./testsuite 177"
        User time (seconds): 165.31
        System time (seconds): 3.89
        Percent of CPU this job got: 85%
        Elapsed (wall clock) time (h:mm:ss or m:ss): 3:18.74
        Average shared text size (kbytes): 0
        Average unshared data size (kbytes): 0
        Average stack size (kbytes): 0
        Average total size (kbytes): 0
        Maximum resident set size (kbytes): 0
        Average resident set size (kbytes): 0
        Major (requiring I/O) page faults: 137
        Minor (reclaiming a frame) page faults: 530354
        Voluntary context switches: 5745
        Involuntary context switches: 24071
        Swaps: 0
        File system inputs: 0
        File system outputs: 0
        Socket messages sent: 0
        Socket messages received: 0
        Signals delivered: 0
        Page size (bytes): 4096
        Exit status: 0

monotone$ /usr/bin/time -v ./testsuite 177
## -------------------------------------------- ##
## monotone 0.18 test suite: integration tests. ##
## -------------------------------------------- ##
177: netsync largish file                         ok

## ------------- ##
## Test results. ##
## ------------- ##

1 test was successful.
        Command being timed: "./testsuite 177"
        User time (seconds): 165.80
        System time (seconds): 4.07
        Percent of CPU this job got: 75%
        Elapsed (wall clock) time (h:mm:ss or m:ss): 3:46.33
        Average shared text size (kbytes): 0
        Average unshared data size (kbytes): 0
        Average stack size (kbytes): 0
        Average total size (kbytes): 0
        Maximum resident set size (kbytes): 0
        Average resident set size (kbytes): 0
        Major (requiring I/O) page faults: 2008
        Minor (reclaiming a frame) page faults: 566454
        Voluntary context switches: 8330
        Involuntary context switches: 24386
        Swaps: 0
        File system inputs: 0
        File system outputs: 0
        Socket messages sent: 0
        Socket messages received: 0
        Signals delivered: 0
        Page size (bytes): 4096
        Exit status: 0

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