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Diffstat (limited to 'website/manual.md')
| -rw-r--r-- | website/manual.md | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/website/manual.md b/website/manual.md index b29311b19..ec007783c 100644 --- a/website/manual.md +++ b/website/manual.md @@ -901,8 +901,10 @@ To start profiling, # Make sure we're only building release. # Build deno and V8's d8. ./tools/build.py --release d8 deno + # Start the program we want to benchmark with --prof -./target/release/deno tests/http_bench.ts --allow-net --prof & +./target/release/deno tests/http_bench.ts --allow-net --v8-flags=--prof & + # Exercise it. third_party/wrk/linux/wrk http://localhost:4500/ kill `pgrep deno` @@ -929,6 +931,18 @@ isolate-0x7fad98242400-v8.log --preprocess > prof.json Open `third_party/v8/tools/profview/index.html` in your browser, and select `prof.json` to view the distribution graphically. +Useful V8 flags during profiling: + +- --prof +- --log-internal-timer-events +- --log-timer-events +- --track-gc +- --log-source-code +- --track-gc-object-stats + +Note that you might need to run Deno with `--current-thread` flag to capture +full V8 profiling output. + To learn more about `d8` and profiling, check out the following links: - [https://v8.dev/docs/d8](https://v8.dev/docs/d8) |