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    - whether host is "reliable" for an app version
    - whether host is eligible for single replication for an app version
    - whether to use host scaling
    In each case, the answer is yes if the number of
    consecutive valid results is above a threshold.
    This replaces existing "error rate" and "scale probation" mechanisms.

    TODO: the # of consecutive valid results should also determine
        a limit on jobs in progress for an app version.
        Namely, if N is the threshold for host scaling, the limit should be
            ndevices*(max(1, consecutive_valid - N))
        The client currently doesn't supply enough
        app version info to do this.
        It could be approximated; that would give some protection
        against cherry-picking.
- credit: more conservative formulas for combining claimed credit
    among replicas.
    If there are normal replicas, we use a "low average"
    that weights each sample by the sum of the other samples.
    Otherwise we use the min (not the average) of the approximate samples.

NOTE: a DB update is required


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Mac Installer: PostInstall gets short / Posix user name from getpwnam(), writes additional diagnostic information to installer log

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    If a driver call to get available mem fail, mark the GPU as unusable.


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		of other jobs of that type.
		They're waiting for GPU RAM, which may now be available.
	- client: bug fix in GPU RAM availability
	- client: fix testing setup for GPU RAM availability

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    old: assign GPUs, then check available RAM
        Problem: may cause starvation on multi-GPU systems.
    new: use available RAM info in the assignment process.
        Prevents starvation, also reduces the number of driver calls.

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Mac Installer: AddRemoveUser utility accepts both full / login user names and short / Posix user names

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for a GPU if it lacks available memory

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        size to the dialog creation routines instead of setting the size
        after dialog initialization.  Avoids artifacts and things having
        to be tweaked later.
        
    clientgui/
        DlgEventLog.cpp, .h

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    - daily quota mechanism
    - reliable mechanism (accelerated retries)
    - "trusted" mechanism (adaptive replication)
- scheduler: enforce host scale probation only for apps with
    host_scale_check set.
- validator: do scale probation on invalid results
    (need this in addition to error and timeout cases)
- feeder: update app version scales every 10 min, not 10 sec
- back-end apps: support --foo as well as -foo for options

Notes:
- If you have, say, cuda, cuda23 and cuda_fermi plan classes,
    a host will have separate quotas for each one.
    That means it could error out on 100 jobs for cuda_fermi,
    and when its quota goes to zero,
    error out on 100 jobs for cuda23, etc.
    This is intentional; there may be cases where one version
    works but not the others.
- host.error_rate and host.max_results_day are deprecated

TODO:
    - the values in the app table for limits on jobs in progress etc.
        should override rather than config.xml.

Implementation notes:
scheduler:
    process_request():
        read all host_app_versions for host at start;
        Compute "reliable" and "trusted" for each one.
        write modified records at end
    get_app_version():
        add "reliable_only" arg; if set, use only reliable versions
        skip over-quota versions
    Multi-pass scheduling: if have at least one reliable version,
        do a pass for jobs that need reliable,
        and use only reliable versions.
        Then clear best_app_versions cache.
    Score-based scheduling: for need-reliable jobs,
        it will pick the fastest version,
        then give a score bonus if that version happens to be reliable.
    When get back a successful result from client:
        increase daily quota
    When get back an error result from client:
        impose scale probation
        decrease daily quota if not aborted
Validator:
    when handling a WU, create a vector of HOST_APP_VERSION
        parallel to vector of RESULT.
        Pass it to assign_credit_set().
        Make copies of originals so we can update only modified ones
    update HOST_APP_VERSION error rates
Transitioner:
    decrease quota on timeout


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adapt Einstein@home-specific file management hack to current run

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- scheduler: fix bug that broke anon platform

Note: Bruce Allen once advised me to take a few days and just
observe BOINC in action.
I should really do this more often; it always turns up bugs
and/or design flaws.


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