Translation Summary

The final part of a log file includes a report of the number of features read and written:

______________________________________________________________________________
                            Features Read Summary
______________________________________________________________________________
CityParks                                                                   69
CommunityCentres                                                            10
DrinkingFountains                                                          113
FoodVendors                                                                 91
GarbageSchedule                                                              6
Libraries                                                                    8
TransitStations                                                             11
______________________________________________________________________________
Total Features Read                                                        308
______________________________________________________________________________
______________________________________________________________________________
                           Features Written Summary
______________________________________________________________________________
CommunityFacilities                                                         18
Miscellaneous                                                              108
ParkFeatures                                                               182
______________________________________________________________________________
Total Features Written                                                     308
______________________________________________________________________________

More importantly, from a performance point of view, it includes a brief report of the time taken by the translation and the amount of memory used:

Translation was SUCCESSFUL with 0 warning(s) (308 feature(s) output)
FME Session Duration: 1.1 seconds. (CPU: 0.8s user, 0.3s system)
END - ProcessID: 3984, peak process memory usage: 105448 kB, current process memory usage: 93964 kB
Translation was SUCCESSFUL

Peak memory usage is an important statistic. It signifies how hard FME is having to work. If this number can be reduced, performance will often improve.

Written Features

One of the most misinterpreted statistics in an FME log is the number of features written.

What this really means is “the number of features sent to the writer”. It doesn’t always mean the same number of features actually gets written to the output dataset, or that the output dataset will contain only that number of features.

For example, a feature sent to a writer might be rejected because of invalid geometry. In that case the log reports the feature written, but an earlier warning might note:

Rejected 1 output feature

Similarly, a format may have geometry limitations that cause the output dataset to be slightly different to the numbers logged.

For example, MicroStation DGN format has a limit on vertex numbers for each element (feature). If the MicroStation writer receives a feature with too many vertices, it splits that feature into multiple MicroStation features (elements in MicroStation speak) to avoid going over the vertex limit.

Thus, the number of features that actually appear in the dataset can be different to the number of features logged as being sent to the writer!