[Issue 2504] Reserve for associative arrays

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=2504

Jon Degenhardt <jrdemail2000-dlang at yahoo.com> changed:

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--- Comment #5 from Jon Degenhardt <jrdemail2000-dlang at yahoo.com> ---
I have noticed meaningful performance degradation after associative arrays
reach about 10 million entries. I gave some GC related numbers in this forum
post: https://forum.dlang.org/post/flxmwyeuhjcuekfeduar@forum.dlang.org

In addition to GC stats, it appears likely that resizing the underlying array
will be costly at these numbers. Having an ability to reserve capacity for a
minimum number of keys may address this.

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