commit 08c802c7fc4e53363a6d9626349466a2285ef35f
author Jens Johansen <jensj@google.com> Fri Jan 31 00:58:00 2025 -0800
committer Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> Fri Jan 31 00:58:00 2025 -0800
tree 974580c85927e013b112f3443b1f6b91ac33630f
parent a11aeeb5007bb118e49c60ff84c6edbfab4232a4

[CFE] Additions to benchmarker.dart et al

## Added --cache to benchmarker.dart

This doubles the amount of runs by running an additional round of `perf
stat` runs outputting low level cache information: L1-icache-load-misses
(instruction load misses), LLC-loads (last level cache loads, i.e.
probably how many loads goes to L3 cache) and LLC-load-misses (last
level cache load misses, i.e. how many loads goes to ram). I don't know
if these are generally available, only that they are available on my
machine.

## Added --silent to benchmarker.dart

Some benchmarks output information to stdout which is great when running
it by hand, but when running it via the benchmarker script it just
pollutes the output: The benchmarker script et al measures what is
supposed to be measured. This CL adds the `--silent` option to the
benchmarker script which then won't print the stdout output from the
benchmarkee.

## Output filename in benchmarker.dart

This CL adds the filenames of the benchmarked snapshots in an attempt to
avoid confusion. Example output before:

```
Comparing snapshot #1 with snapshot #2
```

```
Example output now:
Comparing snapshot #1 (optimization_attempt_41.aot) with snapshot #2 (optimization_attempt_42.aot)
```

## Utility to summarize --verbose-gc output

Takes input from --verbose-gc from stdin and summarizes the time taken
on GC and reports it back. Example:

```
$ out/ReleaseX64/dart --verbose-gc hello.dart 2> /dev/stdout 1> /dev/null | out/ReleaseX64/dart pkg/front_end/tool/verbose_gc_helper.dart
6.1
```

Change-Id: I206f21cd8b42f844e60358aed711e676e453c77c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/406845
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>