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Bug 1573904 - Measure the potential for a streaming parser. data-review=chutten r=jorendorff,chutten

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Differential Revision: https://phabricator.services.mozilla.com/D42039
This commit is contained in:
Nicolas B. Pierron
2019-08-26 15:26:16 +00:00
parent 502384398c
commit a53b8d4583
3 changed files with 44 additions and 0 deletions
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16
dom/script/ScriptLoadHandler.cpp
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@@ -71,6 +71,22 @@ nsresult ScriptLoadHandler::DecodeRawDataHelper(const uint8_t* aData,
MakeSpan(scriptText.begin() + haveRead, needed.value()), aEndOfStream);
MOZ_ASSERT(written <= needed.value());
// Telemetry: Measure the throughput at which bytes are streamed and the ratio
// of streamed bytes, such that we can determine the effectiveness of a
// streaming parser for JavaScript.
using namespace mozilla::Telemetry;
if (aEndOfStream && haveRead) {
// Compute the percent of data transfered incrementally.
Accumulate(DOM_SCRIPT_LOAD_INCREMENTAL_RATIO, 100 * haveRead / (haveRead + written));
// Compute the rate of transfer of the incremental data calls averaged
// across the time needed to complete the request.
double ms = (TimeStamp::Now() - mFirstOnIncrementalData).ToMilliseconds();
Accumulate(DOM_SCRIPT_LOAD_INCREMENTAL_AVG_TRANSFER_RATE, haveRead / ms);
}
if (!aEndOfStream && !haveRead) {
mFirstOnIncrementalData = TimeStamp::Now();
}
haveRead += written;
MOZ_ASSERT(haveRead <= capacity.value(),
"mDecoder produced more data than expected");