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Currently, the only reason for doing a\r\n`stat` call is to get the size (and throw the size mismatch error if the\r\nsize is different). This is unnecessary for 3 reasons:\r\n\r\n1. In the case of `read.stream`, the stream already compares the sizes\r\nat the end and throws an error if there's a mismatch.\r\n2. In the case of `read`, we can compare the sizes after reading the\r\ncache contents\r\n3. In both cases we are already doing an integrity check which would\r\nautomatically fail if there's a size difference since the hashes would\r\nbe different.\r\n\r\nIn this PR, the `stat` call is only made if the user does not pass a\r\n`size` property via `opts`. This makes sense because without knowing the\r\n`size`, the stream has to make an unnecessary `fs.read` call at the end\r\nbefore closing which has a significant cost (that cost is much, much\r\ngreater than the cost of doing `fs.stat`).\r\n\r\nOn my machine, the benchmarks with this change look like this:\r\n```\r\n┌─────────┬─────────────────────┬─────────┬────────────────────┬───────────┬─────────┐\r\n│ (index) │      Task Name      │ ops/sec │ Average Time (ns)  │  Margin   │ Samples │\r\n├─────────┼─────────────────────┼─────────┼────────────────────┼───────────┼─────────┤\r\n│    0    │ 'read.stream (new)' │ '4,643' │ 215352.03841424757 │ '±10.20%' │   465   │\r\n│    1    │ 'read.stream (old)' │ '3,933' │ 254237.5665025663  │ '±7.17%'  │   394   │\r\n│    2    │    'read (old)'     │ '2,915' │ 343045.55719845917 │ '±13.42%' │   292   │\r\n│    3    │    'read (new)'     │ '4,392' │ 227636.30011033904 │ '±12.14%' │   449   │\r\n└─────────┴─────────────────────┴─────────┴────────────────────┴───────────┴─────────┘\r\n```\r\n\r\nThat's a solid 16% improvement in the case of `read.stream` and 36%\r\nimprovement in the case of `read`.","shortMessageHtmlLink":"fix: Speed up cache reads (<a class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"2055064892\" data-permission-text=\"Title is private\" data-url=\"https://github.com/npm/cacache/issues/255\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/npm/cacache/pull/255/hovercard\" href=\"https://github.com/npm/cacache/pull/255\">#255</a>)"}}],"hasNextPage":true,"hasPreviousPage":false,"activityType":"all","actor":null,"timePeriod":"all","sort":"DESC","perPage":30,"cursor":"djE6ks8AAAAEQhn5awA","startCursor":null,"endCursor":null}},"title":"Activity · npm/cacache"}