revert the alert-threshold to %130

Signed-off-by: jiaxiao zhou <[email protected]>

.github/workflows/benchmarks.yml

@@ -4,10 +4,6 @@ on:
   schedule:
     - cron: '0 0 * * *'  # Runs daily at midnight
   pull_request:
-
-permissions:
-  contents: write # Required for commit comment for alert
-  pull-requests: write # Required for commit comment for alert
 
 jobs:
   benchmark:
@@ -40,10 +36,11 @@ jobs:
           name: Criterion.rs Benchmark
           tool: 'cargo'
           output-file-path: output.txt
-          # GitHub API token to make a commit comment
           github-token: ${{ secrets.GITHUB_TOKEN }}
-          # Show alert with commit comment on detecting possible performance regression
-          alert-threshold: '1%'
+          # my experimental local benchmarking seems to have a 20% margin of error. 
+          # So I set the alert threshold to 130% of the previous benchmark result.
+          # If the current benchmark result is more than 130% of the previous benchmark result, it will fail.
+          alert-threshold: '130%'
           fail-on-alert: true
           alert-comment-cc-users: '@runwasi-committers'
           # Enable Job Summary