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[Cache] Use sub-second accuracy for internal expiry calculations #27031
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LGTM |
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PR rebased. Status: needs review |
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fabpot
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Jun 11, 2018
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Thank you @nicolas-grekas. |
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…lculations (nicolas-grekas) This PR was merged into the 4.2-dev branch. Discussion ---------- [Cache] Use sub-second accuracy for internal expiry calculations | Q | A | ------------- | --- | Branch? | master | Bug fix? | no | New feature? | not really | BC breaks? | no | Deprecations? | no | Tests pass? | yes | Fixed tickets | - | License | MIT | Doc PR | - Embeds #26929, #27009 and #27028, let's focus on the 4th commit for now. This is my last significant PR in the Cache series :) By using integer expiries internally, our current implementations are sensitive to abrupt transitions when time() goes to next second: `$s = time(); sleep(1); echo time() - $s;` *can* display 2 from time to time. This means that we do expire items earlier than required by the expiration settings on items. This also means that there is no way to have a sub-second expiry. For remote backends, that's fine, but for ArrayAdapter, that's a limitation we can remove. This PR replaces calls to `time()` by `microtime(true)`, providing more accurate timing measurements internally. Commits ------- 08554ea [Cache] Use sub-second accuracy for internal expiry calculations
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Embeds #26929, #27009 and #27028, let's focus on the 4th commit for now.
This is my last significant PR in the Cache series :)
By using integer expiries internally, our current implementations are sensitive to abrupt transitions when time() goes to next second:
$s = time(); sleep(1); echo time() - $s;can display 2 from time to time.This means that we do expire items earlier than required by the expiration settings on items.
This also means that there is no way to have a sub-second expiry. For remote backends, that's fine, but for ArrayAdapter, that's a limitation we can remove.
This PR replaces calls to
time()bymicrotime(true), providing more accurate timing measurements internally.