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Note that 7-Zip can compress slowly some data. So that timeout value is not 100% safe.
2013-02-18 09:20:29 PST in p7zip
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Yes, 7-Zip uses block multithreading starting from 4 threads (-mmt4) for -mx5 mode.
-mmt2 -mx5 uses internal LZMA multithreading. So it doesn't need to write whole block,
-mmt3 works as -mmt2.
2013-02-18 08:50:28 PST in p7zip
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So what upload speed do you have with curl.exe?
Is curl.exe faster than 7 Mbyte / 20 sec?
Do you think that 20 seconds pause is the problem for curl.exe?.
2013-02-18 08:05:05 PST in p7zip
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If the block is big (64 MB for -md24), there is big delay between writing requests.
1) what output speed do you have for the command:
-txz -mmt4 -mx5 -md24
in HDD (without internet)?
2) and what internet uploading speed do you have?.
2013-02-18 02:27:57 PST in p7zip
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In the following tests I try to find exact block size with errors:
-txz -mmt4 -mx5 -md16
-txz -mmt4 -mx5 -md17
-txz -mmt4 -mx5 -md18
-txz -mmt4 -mx5 -md19
-txz -mmt4 -mx5 -md20
-txz -mmt4 -mx5 -md21
-txz -mmt4 -mx5 -md22
-txz -mmt4 -mx5 -md23
-txz -mmt4 -mx5 -md24.
2013-02-17 21:21:27 PST in p7zip