node: improve nextTick performance #1571
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mscdex
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| callback(); | ||
| threw = false; | ||
| } finally {} | ||
| return threw; |
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What's the point of a try { ... } finally {} with an empty finalizer?
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I just copied from the original function (_tickCallback/_tickDomainCallback). I can safely delete it I guess? Unless it was originally supposed to catch exceptions?
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in _tickCallback there's code in the finalizer – if control passes to the finalizer, tickDone is called before the exception propagates as usual. It should be replicable by moving the try {} finally { if (threw) tickDone() } back up into _tickCallback, wrapping these lines in the TryClause.
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@chrisdickinson I've adjusted the benchmarks, is that what you had in mind? |
| else if (i % 2 === 0) | ||
| process.nextTick(cb2, false, 5.1); | ||
| else | ||
| process.nextTick(cb1, 0); |
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might add a case for process.nextTick(cb) by itself.
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So I should merge the pre-existing non-args benchmark with this one?
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@mscdex re: benchmarks, yep! I had one other pony request relating to them (related to including |
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A bit verbose, but if it offers the performance improvements you said then I'm okay with the change. |
| } finally { | ||
| if (threw) | ||
| tickDone(); | ||
| args = tock.args; |
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a nit: would you mind adding a comment briefly explaining why this call is separated into a switch statement, for future readers?
This commit uses separate functions to isolate deopts caused by try-catches and avoids fn.apply() for callbacks with small numbers of arguments. These changes improve performance by ~1-40% in the various nextTick benchmarks.
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Cool – after the changes, are the numbers still ~2-42% better than the previous implementation? If so, LGTM! |
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@chrisdickinson Yep, performance is still in the same range. |
This commit uses separate functions to isolate deopts caused by try-catches and avoids fn.apply() for callbacks with small numbers of arguments. These changes improve performance by ~1-40% in the various nextTick benchmarks. PR-URL: #1571 Reviewed-By: Trevor Norris <[email protected]> Reviewed-By: Chris Dickinson <[email protected]>
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Landed in c7782c0. |
This commit uses separate functions to isolate deopts caused by try-catches and avoids fn.apply() for callbacks with small numbers of arguments. These changes improve performance by ~1-40% in the various nextTick benchmarks. PR-URL: nodejs#1571 Reviewed-By: Trevor Norris <[email protected]> Reviewed-By: Chris Dickinson <[email protected]>
This commit uses separate functions to isolate deopts caused by
try-finallys and avoids
fn.apply()for callbacks with small numbersof arguments.
These changes improve performance by ~2-42% in the various
nextTick benchmarks.