annotate mupdf-source/thirdparty/curl/docs/PARALLEL-TRANSFERS.md @ 40:aa33339d6b8a upstream

ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
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1 # Parallel transfers
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3 curl 7.66.0 introduces support for doing multiple transfers simultaneously; in
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4 parallel.
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6 ## -Z, --parallel
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8 When this command line option is used, curl will perform the transfers given
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9 to it at the same time. It will do up to `--parallel-max` concurrent
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10 transfers, with a default value of 50.
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12 ## Progress meter
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14 The progress meter that is displayed when doing parallel transfers is
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15 completely different than the regular one used for each single transfer.
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17 It shows:
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19 o percent download (if known, which means *all* transfers need to have a
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20 known size)
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21 o precent upload (if known, with the same caveat as for download)
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22 o total amount of downloaded data
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23 o total amount of uploaded data
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24 o number of transfers to perform
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25 o number of concurrent transfers being transferred right now
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26 o number of transfers queued up waiting to start
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27 o total time all transfers are expected to take (if sizes are known)
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28 o current time the transfers have spent so far
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29 o estimated time left (if sizes are known)
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30 o current transfer speed (the faster of UL/DL speeds measured over the last
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31 few seconds)
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33 Example:
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35 DL% UL% Dled Uled Xfers Live Qd Total Current Left Speed
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36 72 -- 37.9G 0 101 30 23 0:00:55 0:00:34 0:00:22 2752M
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38 ## Behavior differences
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40 Connections are shared fine between different easy handles, but the
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41 "authentication contexts" are not. So for example doing HTTP Digest auth with
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42 one handle for a particular transfer and then continue on with another handle
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43 that reuses the same connection, the second handle can't send the necessary
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44 Authorization header at once since the context is only kept in the original
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45 easy handle.
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47 To fix this, the authorization state could be made possible to share with the
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48 share API as well, as a context per origin + path (realm?) basically.
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50 Visible in test 153, 1412 and more.
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52 ## Feedback!
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54 This is early days for parallel transfer support. Keep your eyes open for
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55 unintended side effects or downright bugs.
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57 Tell us what you think and how you think we could improve this feature!
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