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Remove profiling limit on files with <= 2^16 lines #1913

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merged 1 commit into from
Nov 21, 2017

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fingolfin
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The new limit is 2^31, which should be sufficient for everybody (TM).

It exploits the fact that all statements in a T_BODY come from the same file, and that file is being recored in the T_BODY bag anyway.

Previously, the filename was stored as a string object in the T_BODY. This still is supported (and used by some code), but for regular GAP functions, we now instead store an immediate integer indexing into the filecache. This is so that profiling code does not have to be modified to heavily.

The new limit is 2^31, which should be sufficient for everybody (TM).
@fingolfin fingolfin added kind: enhancement Label for issues suggesting enhancements; and for pull requests implementing enhancements topic: kernel labels Nov 16, 2017
@fingolfin
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@ChrisJefferson any thoughts on this?

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My concern is that I'm not completely sure when we get a string, and when we get an int, and exactly how that effects various things. Profiling will never output anything about lines where we store a string instead of an ID. When does that happen, and should it worry us?

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It will happen if and only if it happened before. Which I think is never for actual GAP functions (and always for non-GAP functions, just like before). We could add a GAP_ASSERT to verify that.

@olexandr-konovalov olexandr-konovalov added this to the GAP 4.9.0 milestone Nov 21, 2017
@ChrisJefferson ChrisJefferson merged commit 1d0042b into gap-system:master Nov 21, 2017
@fingolfin fingolfin deleted the mh/gapnameid branch November 21, 2017 17:48
@olexandr-konovalov olexandr-konovalov added the release notes: added PRs introducing changes that have since been mentioned in the release notes label Jan 22, 2018
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