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Dashed line: the % threshold. The letter is only written while available RAM is above it.
Dear Sam Altman,
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A small bash script on this machine checks how much RAM is available every five minutes. While more than 10% is free, there is a letter to write. This page shows todayās letter with the current numbers, so the wording of the email that actually goes out may differ.
āAvailableā is the kernelās own estimate of memory that new programs can use without swapping. It counts reclaimable page cache, because the kernel hands that back the moment anything asks.