W1 option take-over into W2

[Juergen Reuter]

1. events_per_file, including starting number, for some formats
2. show_* for debug output format

implemented in 2.1, not yet in 2.2

1. fragment/fragmentation_method
2. plot_width, plot_height
3. accuracy_goal
4. keep best grid as fall back option like W1
5. allow to ignore checksum test

obsolete:

1. use_efficiency (efficiency fluctuates)
2. time_limit_adaptation (dangerous and machine dependent)
3. generate_phase_space (old development flag)
4. write_phase_space_channels_file
5. extra_off_shell_lines
6. splitting_depth (only single logs, not important)
7. single/double_off_shell_branchings/decays
8. massive_fsr
9. single/double_off_shell_branchings/decays
10. write_weights/write_weights_file
11. guess_color_flow
12. pythia_processes
13. time_limit (only for hard nosed batch systems)
14. warn_empty_channel (only for pathological cases)
15. show_pythia_initialization
16. show_pythia_statistics
17. screen_events, screen_histograms
18. screen_diagnostics
19. plot_grids_channels, plot_grids_logscale (impractical for large number of channels?)

[kilian]

OK, let's start working on this ...

[kilian]

accuracy_goal: done in r3658.

There are now three goals: accuracy_goal, error_goal, relative_error_goal. If all goals that are set have been reached in the adaptation pass, the rest of the adaptation pass is skipped and WHIZARD proceeds with the final integration pass.

The nontrivial part was to make this work correctly with iterations read from file. They are reused where possible, even if the goals are changed in a second run.

[Juergen Reuter]

Those are actually defects as features that have been damaged or crippled.

[Juergen Reuter]

One of the last remaining things from W1.

[Juergen Reuter]

Actually, I just had needed option 2 of the remaining tasks :(

[Juergen Reuter]

Well, I need them now(ish)

[Juergen Reuter]

After the upgrade from WHIZARD 2.1.x to 2.2.0 we have to recheck again that all these options are in :(

[Juergen Reuter]

W1 -> W2.1.x -> W2.2.x .... :(

[kilian]

Since this is already assigned, I might just do it now ...

[Juergen Reuter]

Cool. And please don't forget to re-check those features marked as implemtented here again.

[kilian]

r4981 covers

1. safety_factor, flag events w/weight > 1 (plot_excess)

Event weight excess in rejection (unweighting) is now always recorded and displayed at the end of the simulation pass. A safety_factor may be given to the simulate command to reduce the acceptance probability and thus reduce excess. Event excess can be separately plotted using record_excess. This offers more flexibility than the W1 version, where it was always plotted on top of the unweighted events. (Assuming that the drawing options will be improved in future versions, anyway.)

[kilian]

Partially done:

1. events_per_file, including starting number

Implemented for the eio_ascii set of formats. The global variables are sample_split_n_evt and {{sample_split_index}}}. Not yet implemented for other formats, but this should be straightforward. the relevant TBP is called eio_split_out.

Also done:

2. signal handling: save/restore vamp grid CONTENTS

Signals are blocked by default. At important points in code, the signal status is queried by signal_is_pending and, if necessary, the current routine returns. This works like a poor-man's exception mechanism. The actual termination points are after each SINDARIN command. (In the cascades module, I kept termination points as they were before.)

This way of treating signals allows to do some cleanup, such as properly closing event files, before the program aborts. In the previous implementation, there was only the possibility of immediate abort at various points.

The issue of snapshooting VAMP is nontrivial. I deferred this to #572.

There are no tests for signal handling; this is difficult. Practice should show whether I missed something.