[tahoe-dev] Tahoe benchmarking data
david-sarah at jacaranda.org
Mon Jul 26 04:19:28 UTC 2010
Brian Warner wrote:
> On 7/25/10 8:10 PM, Kyle Markley wrote:
>> I wonder whether temporary file creation for the small file transfers
>> might be part of the problem. I know that temporary files are created on
>> occasion; could someone explain precisely when?
> There aren't very many. The most relevant one here is that "large" HTTP
> request bodies (the threshold is 100kB) are held on disk (instead of in
> RAM) between the HTTP PUT/POST request and the actual
> encrypt+encode+push upload. [...] The other two places are:
> * when you do a download with a Range: header that doesn't cover the
> whole file, the 1.7.1 code creates a temporary file to hold the
> incoming data (and then does seek()+read() to return just the desired
> * if you're using a Helper, then the helper holds encrypted upload data
> on disk until the ciphertext transfer is complete and it can start
> the real encode+push.
Just for completeness, the FTP and SFTP frontends also create temporary
files when you use those frontends for an upload.
David-Sarah Hopwood ⚥ http://davidsarah.livejournal.com
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