add --track-heap-objects #2135
add --track-heap-objects #2135
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Fishrock123
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Does doc/iojs.1 also need to be modified? |
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I am not able to understand why we need the whitespace changes. |
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@thefourtheye it was to keep 2 spaces between the switch and the description and keeping all of the descriptions aligned |
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@ofrobots i can but I saw that |
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@bmeck Ah, I see what you are saying now. |
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@thefourtheye correct |
| // --track-heap-objects | ||
| if (track_heap_objects) { | ||
| READONLY_PROPERTY(process, "trackHeapObjects", True(env->isolate())); | ||
| } |
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Shouldn't we explicitly set this to False, in the else part?
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none of the other switches work that way
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Does it even need to be exposed to JS land?
(I guess the same question applies to .traceSyncIO, /cc @trevnorris.)
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Yup. You're right. I can't think of a useful case to expose either of them to JS.
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Good to know. @bmeck Can you remove the .trackHeapObjects property (and .traceSyncIO in a separate commit if you want)?
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@bnoordhuis removed trackHeapObjects from process, separate PR for traceSyncIO #2143 |
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LGTM |
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LGTM |
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Do we need a test for this? |
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@thefourtheye node itself does not include a way to dump heap snapshots, we could write one up but it would be akin to including |
- This makes v8 add .trace_function_info to the serialized form of snapshots from v8::HeapSnapshot::Serialize - .trace_funciton_info combined with .trace_node in snapshots tells the JS location that allocated a specific object
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- This makes v8 add .trace_function_info to the serialized form of snapshots from v8::HeapSnapshot::Serialize - .trace_funciton_info combined with .trace_node in snapshots tells the JS location that allocated a specific object PR-URL: #2135 Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Trevor Norris <[email protected]>
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Squashed and landed in cf14a24. |
Fishrock123
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Notable changes * src: Added a new `--track-heap-objects` flag to track heap object allocations for heap snapshots (Bradley Meck) nodejs#2135. * readline: Fixed a freeze that affected the repl if the keypress event handler threw (Alex Kocharin) nodejs#2107. * npm: Upgraded to v2.13.0, release notes can be found in https://github.com/npm/npm/releases/tag/v2.13.0 (Forrest L Norvell) nodejs#2152. PR-URL: nodejs#2189
Right now we do not have a way to start iojs with heap object tracking.
Calling
v8::Profiler::StartTrackingHeapObjectsafter node has started up will not include the reference info for objects in node core. This can be seen by runningnode-heapdumpwith the flag turned on. This information is useful for debugging tools and would be visible in Chrome DevTools in the same way that "Record heap allocation stack traces" functions from the DevTools settings pane.