Re: [Monotone-devel] BSD Buildbots

[Lapo Luchini]

Zack Weinberg wrote:
> I think there might be something else weird with those buildbots.
> That test shouldn't use anything like 256MB of memory - in fact,
> massif claims it never gets above 10MB (see attached graph).  It does
> repeatedly allocate and then free about 10MB of memory, though; the
> only thing I can think of is that the malloc() implementation on the
> buildbot is stuck in some debugging mode where it never reuses a
> memory block, and that it has substantially more overhead than
> massif's (fairly dumb) guess.

Indeed "time -l" confirms that (and AFAIK that reads kernel data about
actual max memory used, it's not an approximation).

% /usr/bin/time -l softlimit -d11000000 sh -c './unit_tester
refiner:various_counts 2>/dev/null'
load: 0.99  cmd: unit_tester 49383 [runnable] 312.86u 3.36s 98% 9704k
      602,70 real       573,98 user         6,34 sys
     10768  maximum resident set size
      4564  average shared memory size
      6080  average unshared data size
       131  average unshared stack size
     64920  page reclaims
         0  page faults
         0  swaps
         0  block input operations
         0  block output operations
         0  messages sent
         0  messages received
         0  signals received
         9  voluntary context switches
    599723  involuntary context switches

About the hypotetic "debug mode"... I don't know nothing about that,
i.e. if something of that sort is in place it's not intentional (but I
really know nothing about the python/twistd part of the bot).

-- 
Lapo Luchini
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