Lot of <unknown>

[bjorn3]

rustc 1.42.0-nightly (3ebcfa145 2020-01-12) with measureme 232db90.

+---------------------------------------------+-----------+-----------------+------------+------------+--------------+-----------------------+
| Item                                        | Self time | % of total time | Item count | Cache hits | Blocked time | Incremental load time |
+---------------------------------------------+-----------+-----------------+------------+------------+--------------+-----------------------+
| <unknown>                                   | 12.00s    | 70.392          | 870543     | 0          | 0.00ns       | 0.00ns                |
+---------------------------------------------+-----------+-----------------+------------+------------+--------------+-----------------------+
| expand_crate                                | 1.12s     | 6.563           | 1          | 0          | 0.00ns       | 0.00ns                |
+---------------------------------------------+-----------+-----------------+------------+------------+--------------+-----------------------+
| resolve_crate                               | 926.07ms  | 5.434           | 1          | 0          | 0.00ns       | 0.00ns                |
+---------------------------------------------+-----------+-----------------+------------+------------+--------------+-----------------------+
| link_rlib                                   | 482.88ms  | 2.833           | 1          | 0          | 0.00ns       | 0.00ns                |
+---------------------------------------------+-----------+-----------------+------------+------------+--------------+-----------------------+
| generate_crate_metadata                     | 358.57ms  | 2.104           | 1          | 0          | 0.00ns       | 0.00ns                |
+---------------------------------------------+-----------+-----------------+------------+------------+--------------+-----------------------+
| build_hir_map                               | 349.00ms  | 2.048           | 1          | 0          | 0.00ns       | 0.00ns                |
+---------------------------------------------+-----------+-----------------+------------+------------+--------------+-----------------------+
| hir_lowering                                | 319.03ms  | 1.872           | 1          | 0          | 0.00ns       | 0.00ns                |
+---------------------------------------------+-----------+-----------------+------------+------------+--------------+-----------------------+
| parse_crate                                 | 267.80ms  | 1.571           | 1          | 0          | 0.00ns       | 0.00ns                |
...

[michaelwoerister]

Interesting. That indicates StringId that is not mapped to an actual string at a later point. Either a typo somewhere, or there are queries executed after a point where I assumed no more queries would be executed...

[michaelwoerister]

Or it's some kind of encoding bug.

[wesleywiser]

Possibly related rust-lang/rust#81251

[jyn514]

@bjorn3 do you still see this now that rust-lang/rust#81275 is merged?

[bjorn3]

Been a while since I last saw this.

[Logarithmus]

I'm having the same problem with big project at work. According to -Ztime-passes, type_check_crate takes majority of time. But according to -Zself-profile, <unknown> is number 1, followed by type_check_crate.
Can't share the source code of the crate, because it's proprietary

rustc 1.88.0-nightly (25cdf1f67 2025-04-28)