Nick Craig-Wood
204f817100
Each resumable upload allocated a fresh chunk-sized buffer (8 MiB by default, up to 64 MiB), so bulk transfers of large files churned allocations and GC. Buffer each chunk in a pool.RW from the global page pool instead so the memory is reused across uploads and bounded by rclone's central memory management. The pool.RW is seekable, so the chunk is rewound at the start of each retry rather than re-wrapped. lib/rest wraps request bodies in readers.NoCloser so the transport cannot return the pages to the pool between attempts - the Content-Length is set through rest.Opts because the wrapped body is not a *bytes.Reader net/http can measure. A source that runs dry before its declared size is reported as an unexpected EOF rather than sending the short chunk.
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